COMMISSION IMPLEMENTING DECISION (EU) 2020/2009
of 22 June 2020
establishing the best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions, for surface treatment using organic solvents including preservation of wood and wood products with chemicals
(notified under document C(2020) 4050)
(Text with EEA relevance)
Article 1
Article 2
ANNEX
Best available techniques (BAT) conclusions for surface treatment using organic solvents including preservation of wood and wood products with chemicals
SCOPE
DEFINITIONS
General terms |
|||||
Term used |
Definition |
||||
Base coat |
Paint which, when applied to a substrate, determines the colour and the effect (e.g. metallic, pearlescent). |
||||
Batch discharge |
Discharge of a discrete, contained volume of water. |
||||
Clear coat |
Coating material which, when applied to a substrate, forms a solid transparent film with protective, decorative or specific technical properties. |
||||
Combiline |
Combination of hot-dip galvanising and coil coating in the same process line. |
||||
Continuous measurement |
Measurement using an automated measuring system permanently installed on site for continuous monitoring of emissions, according to EN 14181. |
||||
Direct discharge |
Discharge to a receiving water body without further downstream waste water treatment. |
||||
Emission factors |
Coefficients that can be multiplied by known data such as plant/process data or throughput data to estimate emissions. |
||||
Existing plant |
A plant that is not a new plant. |
||||
Fugitive emissions |
Fugitive emissions as defined in Article 57(3) of Directive 2010/75/EU. |
||||
Grade B or C creosote |
Types of creosote for which specifications are given in EN 13991. |
||||
Indirect discharge |
Discharge which is not a direct discharge. |
||||
Major plant upgrade |
A major change in the design or technology of a plant with major adjustments or replacements of the process and/or abatement technique(s) and associated equipment. |
||||
New plant |
A plant first permitted on the site of the installation following the publication of these BAT conclusions or a complete replacement of a plant following the publication of these BAT conclusions. |
||||
Off-gas |
The gas extracted from a process, piece of equipment or area which is either directed to treatment or discharged directly to air through a stack. |
||||
Organic compound |
Organic compound as defined in Article 3(44) of Directive 2010/75/EU. |
||||
Organic solvent |
Organic solvent as defined in Article 3(46) of Directive 2010/75/EU. |
||||
Plant |
All parts of an installation that carry out an activity listed in point 6.7 or 6.10 of Annex I to Directive 2010/75/EU and any other directly associated activities which have an effect on consumption and/or emissions. Plants may be new plants or existing plants. |
||||
Primer coat |
Paint formulated for use as a layer on a prepared surface, to provide good adhesion, protection of any layers below and filling of surface irregularities. |
||||
Sector |
Any of the surface treatment activities that are part of activities listed in point 6.7 of Annex I to Directive 2010/75/EU and are referred to in Section 1 of these BAT conclusions. |
||||
Sensitive receptor |
Area which needs special protection, such as:
|
||||
Solid mass input |
The total mass of solids used as defined in Part 5, 3(a)(i) of Annex VII to Directive 2010/75/EU. |
||||
Solvent |
‘Solvent’ refers to ‘organic solvent’. |
||||
Solvent input |
The total quantity of organic solvents used as defined in Part 7, 3(b) of Annex VII to Directive 2010/75/EU. |
||||
Solvent-based (SB) |
Type of paint, ink or other coating material using solvent(s) as the carrier. For the preservation of wood and wood products, it refers to the type of treatment chemicals. |
||||
Solvent-based-mix (SB-mix) |
Solvent-based coating where one of the coating layers is water-based (WB). |
||||
Solvent mass balance (SMB) |
A mass balance exercise conducted at least once every year according to Part 7 of Annex VII to Directive 2010/75/EU. |
||||
Surface run-off water |
Water from precipitation that flows over land or impervious surfaces, such as paved streets and storage areas, rooftops, etc. and does not soak into the ground. |
||||
Total emissions |
The sum of fugitive emissions and emissions in waste gases as defined in Article 57(4) of Directive 2010/75/EU. |
||||
Treatment chemicals |
Chemicals used in wood and wood products preservation such as biocides, chemicals used for waterproofing (e.g. oils, emulsions) and flame retardants. This also includes the carrier of active substances (e.g. water, solvent). |
||||
Valid hourly/half-hourly average |
An hourly/half-hourly average is considered valid when there is no maintenance or malfunction of the automated measuring system. |
||||
Waste gases |
Waste gases as defined in Article 57(2) of Directive 2010/75/EU. |
||||
Water-based (WB) |
Type of paint, ink or other coating material in which water replaces all or part of the solvent content. For the preservation of wood and wood products, it refers to the type of treatment chemicals. |
||||
Wood preservation |
Activities whose purpose is to protect wood and wood products from the damaging effects of fungi, bacteria, insects, water, weather or fire; to provide long-term conservation of structural integrity; and to improve the resistance of wood and wood products. |
Pollutants and parameters |
|
Term used |
Definition |
AOX |
Adsorbable organically bound halogens, expressed as Cl, include adsorbable organically bound chlorine, bromine and iodine. |
CO |
Carbon monoxide. |
COD |
Chemical oxygen demand. Amount of oxygen needed for the total chemical oxidation of the organic matter to carbon dioxide using dichromate. COD is an indicator for the mass concentration of organic compounds. |
Chromium |
Chromium, expressed as Cr, includes all inorganic and organic chromium compounds, dissolved or bound to particles. |
DMF |
N,N-Dimethylformamide. |
Dust |
Total particulate matter (in air). |
F- |
Fluoride. |
Hexavalent chromium |
Hexavalent chromium, expressed as Cr(VI), includes all chromium compounds where the chromium is in the oxidation state +6 (dissolved or bound to particles). |
HOI |
Hydrocarbon oil index. The sum of compounds extractable with a hydrocarbon solvent (including long-chain or branched aliphatic, alicyclic, aromatic or alkyl-substituted aromatic hydrocarbons). |
IPA |
Isopropyl alcohol: propan-2-ol (also called isopropanol). |
Nickel |
Nickel, expressed as Ni, includes all inorganic and organic nickel compounds, dissolved or bound to particles. |
NOX |
The sum of nitrogen monoxide (NO) and nitrogen dioxide (NO2), expressed as NO2. |
PAHs |
Polycyclic aromatic hydrocarbons. |
TOC |
Total organic carbon, expressed as C (in water). |
TVOC |
Total volatile organic carbon, expressed as C (in air). |
TSS |
Total suspended solids. Mass concentration of all suspended solids (in water), measured via filtration through glass fibre filters and gravimetry. |
VOC |
Volatile organic compound as defined in Article 3(45) of Directive 2010/75/EU. |
Zinc |
Zinc, expressed as Zn, includes all inorganic and organic zinc compounds, dissolved or bound to particles. |
ACRONYMS
Acronym |
Definition |
BPR |
Biocidal Products Regulation (Regulation (EU) No 528/2012 of the European Parliament and of the Council of 22 May 2012 concerning the making available on the market and use of biocidal products, OJ L 167, 27.6.2012, p. 1). |
DWI |
Drawn and wall ironed (a type of can in the metal packaging industry). |
EMS |
Environmental management system. |
IED |
Industrial Emissions Directive (2010/75/EU). |
IR |
Infrared. |
LEL |
Lower explosive limit – the lowest concentration (percentage) of a gas or vapour in air capable of producing a flash of fire in the presence of an ignition source. Concentrations lower than LEL are ‘too lean’ to burn. Also called lower flammable limit (LFL). |
OTNOC |
Other than normal operating conditions. |
STS |
Surface treatment using organic solvents. |
UV |
Ultraviolet. |
WPC |
Preservation of wood and wood products with chemicals. |
GENERAL CONSIDERATIONS
Best Available Techniques
Emission levels associated with the best available techniques (BAT-AELs)
BAT-AELs for total and fugitive VOC emissions
BAT-AELs and indicative emission levels for emissions in waste gases
Type of measurement |
Averaging period |
Definition |
Continuous |
Daily average |
Average over a period of one day based on valid hourly or half-hourly averages. |
Periodic |
Average over the sampling period |
Average value of three consecutive measurements of at least 30 minutes each(3). |
BAT-AELs for emissions to water
Other environmental performance levels
Specific energy consumption (energy efficiency) levels associated with the best available techniques (BAT-AEPLs)
Specific water consumption levels associated with the best available techniques (BAT-AEPLs)
Indicative levels for specific waste quantity sent off site
1. BAT CONCLUSIONS FOR SURFACE TREATMENT USING ORGANIC SOLVENTS
1.1.
General BAT conclusions
1.1.1.
Environmental Management Systems
BAT 1.
In order to improve the overall environmental performance, BAT is to elaborate and implement an Environmental Management System (EMS) that incorporates all of the following features:
Note
Applicability
1.1.2.
Overall environmental performance
BAT 2.
In order to improve the overall environmental performance of the plant, in particular concerning VOC emissions and energy consumption, BAT is to:
1.1.3.
Selection of raw materials
BAT 3.
In order to prevent or reduce the environmental impact of the raw materials used, BAT is to use both of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Use of raw materials with a low environmental impact |
As part of the EMS (see BAT 1), systematic evaluation of the adverse environmental impacts of the materials used (in particular substances that are carcinogenic, mutagenic and toxic to reproduction as well as substances of very high concern) and substitution by others with no or lower environmental and health impacts where possible, taking into consideration the product quality requirements or specifications. |
Generally applicable. The scope (e.g. level of detail) and nature of the evaluation will generally be related to the nature, scale and complexity of the plant and the range of environmental impacts it may have, as well as to the type and quantity of materials used. |
(b) |
Optimisation of the use of solvents in the process |
Optimisation of the use of solvents in the process by a management plan (as part of the EMS (see BAT 1)) that aims to identify and implement necessary actions (e.g. colour batching, optimising spray pulverisation). |
Generally applicable. |
BAT 4.
In order to reduce solvent consumption, VOC emissions and the overall environmental impact of the raw materials used, BAT is to use one or a combination of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Use of high-solids solvent-based paints/coatings/varnishes/inks/adhesives |
Use of paints, coatings, liquid inks, varnishes and adhesives containing a low amount of solvents and an increased solids content. |
The selection of the surface treatment techniques may be restricted by the activity type, the substrate type and shape, product quality requirements as well as the need to ensure that the materials used, coating application techniques, drying/curing techniques and off-gas treatment systems are mutually compatible. |
(b) |
Use of water-based paints/coatings/inks/varnishes/adhesives |
Use of paints, coatings, liquid inks, varnishes and adhesives where organic solvent is partially replaced by water. |
|
(c) |
Use of radiation-cured inks/coatings/paints/varnishes/adhesives |
Use of paints, coatings, liquid inks, varnishes and adhesives suitable to be cured by the activation of specific chemical groups by UV or IR radiation, or fast electrons, without heat and without emission of VOCs. |
|
(d) |
Use of solvent-free two-component adhesives |
Use of solvent-free two-component adhesive materials consisting of a resin and a hardener. |
|
(e) |
Use of hot-melt adhesives |
Use of coating with adhesives made from the hot extrusion of synthetic rubbers, hydrocarbon resins and various additives. No solvents are used. |
|
(f) |
Use of powder coatings |
Use of solvent-free coating which is applied as a finely divided powder and cured in thermal ovens. |
|
(g) |
Use of laminate film for web or coil coatings |
Use of polymer films applied onto a coil or web in order to give aesthetic or functional properties, which reduces the number of coating layers needed. |
|
(h) |
Use of substances which are not VOCs or are VOCs of a lower volatility |
Substitution of high-volatility VOC substances with others containing organic compounds that are non-VOCs or VOCs of a lower volatility (e.g. esters). |
1.1.4.
Storage and handling of raw materials
BAT 5.
In order to prevent or reduce fugitive VOC emissions during storage and handling of solvent-containing materials and/or hazardous materials, BAT is to apply the principles of good housekeeping by using all of the techniques given below.
Technique |
Description |
Applicability |
|||||||||||||||||
Management techniques |
|||||||||||||||||||
(a) |
Preparation and implementation of a plan for the prevention and control of leaks and spillages |
A plan for the prevention and control of leaks and spillages is part of the EMS (see BAT 1) and includes, but is not limited to:
|
Generally applicable. The scope (e.g. level of detail) of the plan will generally be related to the nature, scale and complexity of the installation, as well as to the type and quantity of materials used. |
||||||||||||||||
Storage techniques |
|||||||||||||||||||
(b) |
Sealing or covering of containers and bunded storage area |
Storage of solvents, hazardous materials, waste solvents and waste cleaning materials in sealed or covered containers, suitable for the associated risk and designed to minimise emissions. The containers’ storage area is bunded and of adequate capacity. |
Generally applicable. |
||||||||||||||||
(c) |
Minimisation of storage of hazardous materials in production areas |
Hazardous materials are present in production areas only in amounts that are necessary for production; larger quantities are stored separately. |
|||||||||||||||||
Techniques for pumping and handling liquids |
|||||||||||||||||||
(d) |
Techniques to prevent leaks and spillages during pumping |
Leaks and spillages are prevented by using pumps and seals suitable for the material handled and which ensure proper tightness. This includes equipment such as canned motor pumps, magnetically coupled pumps, pumps with multiple mechanical seals and a quench or buffer system, pumps with multiple mechanical seals and seals dry to atmosphere, diaphragm pumps or bellow pumps. |
Generally applicable. |
||||||||||||||||
(e) |
Techniques to prevent overflows during pumping |
This includes ensuring for example that:
|
|||||||||||||||||
(f) |
Capture of VOC vapour during solvent-containing material delivery |
When delivering solvent-containing materials in bulk (e.g. loading or unloading of tanks), the vapour displaced from receiving tanks is captured, usually by back-venting. |
May not be applicable for solvents with low vapour pressure or due to cost considerations. |
||||||||||||||||
(g) |
Containment for spills and/or rapid take-up when handling solvent-containing materials |
When handling solvent-containing materials in containers, possible spills are avoided by providing containment, e.g. by using trolleys, pallets and/or stillages with built-in containment (e.g. ‘catch pans’) and/or rapid take-up by using absorbent materials. |
Generally applicable. |
1.1.5.
Distribution of raw materials
BAT 6.
In order to reduce raw material consumption and VOC emissions, BAT is to use one or a combination of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Centralised supply of VOC-containing materials (e.g. inks, coatings, adhesives, cleaning agents) |
Supply of VOC-containing materials (e.g. inks, coatings, adhesives, cleaning agents) to the application area by direct piping with ring lines, including system cleaning such as pig cleaning or air flushing. |
May not be applicable in the case of frequent changes of inks/paints/coatings/adhesives or solvents. |
(b) |
Advanced mixing systems |
Computer-controlled mixing equipment to achieve the desired paint/coating/ink/adhesive. |
Generally applicable. |
(c) |
Supply of VOC-containing materials (e.g. inks, coatings, adhesives, cleaning agents) at the point of application using a closed system |
In the case of frequent changes of inks/paints/coatings/adhesives and solvents or for small-scale usage, supply of inks/paints/coatings/adhesives and solvents from small transport containers placed near the application area using a closed system. |
|
(d) |
Automation of colour change |
Automated colour changing and ink/paint/coating line purging with solvent capture. |
|
(e) |
Colour grouping |
Modification of the sequence of products to achieve large sequences with the same colour. |
|
(f) |
Soft purge in spraying |
Refilling the spray gun with new paint without intermediate rinsing. |
1.1.6.
Coating application
BAT 7.
In order to reduce raw material consumption and the overall environmental impact of the coating application processes, BAT is to use one or a combination of the techniques given below.
Technique |
Description |
Applicability |
|
Techniques for non-spraying application |
|||
(a) |
Roller coating |
Application where rollers are used to transfer or meter the liquid coating onto a moving strip. |
Only applicable to flat substrates(4). |
(b) |
Doctor blade over roller |
The coating is applied to the substrate through a gap between a blade and a roller. As the coating and substrate pass, the excess is scraped off. |
Generally applicable(4). |
(c) |
No-rinse (dry-in-place) application in the coating of coil |
Application of conversion coatings which do not require a further water rinse using a roller coater (chemcoater) or squeegee rollers. |
Generally applicable(4). |
(d) |
Curtain coating (casting) |
Work-pieces are passed through a laminar film of coating discharged from a header tank. |
Only applicable to flat substrates(4). |
(e) |
Electrocoating (e-coat) |
Paint particles dispersed in a water-based solution are deposited on immersed substrates under the influence of an electric field (electrophoretic deposition). |
Only applicable to metal substrates(4). |
(f) |
Flooding |
The work-pieces are transported via conveyor systems into a closed channel, which is then flooded with the coating material via injection tubes. The excess material is collected and reused. |
Generally applicable(4). |
(g) |
Co-extrusion |
The printed substrate is coupled with a warm, liquefied plastic film and subsequently cooled down. This film replaces the necessary additional coating layer. It may be used between two different layers of different carriers acting as an adhesive. |
Not applicable where high bond strength or resistance to sterilisation temperature is needed(4) . |
Spraying atomisation techniques |
|||
(h) |
Air-assisted airless spraying |
An airflow (shaping air) is used to modify the spray cone of an airless spray gun. |
Generally applicable(4). |
(i) |
Pneumatic atomisation with inert gases |
Pneumatic paint application with pressurised inert gases (e.g. nitrogen, carbon dioxide). |
May not be applicable to coating of wooden surfaces(4). |
(j) |
High-volume low-pressure (HVLP) atomisation |
Atomisation of paint in a spray nozzle by mixing paint with high volumes of air with a low pressure (max. 1,7 bar). HVLP guns have a paint transfer efficiency of > 50 %. |
Generally applicable(4). |
(k) |
Electrostatic atomisation (fully automated) |
Atomisation by high-speed rotational discs and bells and shaping the spray jet with electrostatic fields and shaping air. |
|
(l) |
Electrostatically assisted air or airless spraying |
Shaping the spray jet of pneumatic or airless atomisation with an electrostatic field. Electrostatic paint guns have a transfer efficiency of > 60 %. Fixed electrostatic methods have a transfer efficiency of up to 75 %. |
|
(m) |
Hot spraying |
Pneumatic atomisation with hot air or heated paint. |
May not be applicable for frequent colour changes(4). |
(n) |
‘Spray, squeegee and rinse’ application in the coating of coil |
Sprays are used for application of cleaners, pretreatments and for rinsing. After spraying, squeegees are used to minimise solution dragout, which is followed by rinsing. |
Generally applicable(4). |
Automation of spray application |
|||
(o) |
Robot application |
Robot application of coatings and sealants to internal and external surfaces. |
Generally applicable(4). |
(p) |
Machine application |
Use of paint machines for the handling of the sprayhead/spray gun/nozzle. |
1.1.7.
Drying/curing
BAT 8.
In order to reduce energy consumption and the overall environmental impact from drying/curing processes, BAT is to use one or a combination of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Inert gas convection drying/curing |
The inert gas (nitrogen) is heated in the oven, enabling solvent loading above the LEL. Solvent loads of > 1 200 g/m3 nitrogen are possible. |
Not applicable where dryers need to be opened regularly(5). |
(b) |
Induction drying/curing |
Online thermal curing or drying by electromagnetic inductors that generate heat inside the metallic work-piece by an oscillating magnetic field. |
Only applicable to metal substrates(5). |
(c) |
Microwave and high-frequency drying |
Drying using microwave or high-frequency radiation. |
Only applicable to water-based coatings and inks and non-metallic substrates(5). |
(d) |
Radiation curing |
Radiation curing is applied based on resins and reactive diluents (monomers) which react on exposure to radiation (infrared (IR), ultraviolet (UV)), or high-energy electron beams (EB). |
Only applicable to specific coatings and inks(5). |
(e) |
Combined convection/IR radiation drying |
Drying of a wet surface with a combination of circulating hot air (convection) and an infrared radiator. |
Generally applicable(5). |
(f) |
Convection drying/curing combined with heat recovery |
Heat from off-gases is recovered (see BAT 19 (e)) and used to preheat the input air of the convection dryer/curing oven. |
Generally applicable(5). |
1.1.8.
Cleaning
BAT 9.
In order to reduce VOC emissions from cleaning processes, BAT is to minimise the use of solvent-based cleaning agents and to use a combination of the techniques given below.
Technique |
Description |
Applicability |
||||||
(a) |
Protection of spraying areas and equipment |
Application areas and equipment (e.g. spray booth walls and robots) susceptible to overspray and drips, etc. are covered with fabric covers or disposable foils where foils are not subject to tearing or wear. |
The selection of cleaning techniques may be restricted by the type of process, the substrate or equipment to be cleaned and the type of contamination. |
|||||
(b) |
Solids removal prior to complete cleaning |
Solids are removed in a (dry) concentrated form, usually by hand, with or without the aid of small amounts of cleaning solvent. This reduces the amount of material to be removed by solvent and/or water in subsequent cleaning stages, and therefore the amount of solvent and/or water used. |
||||||
(c) |
Manual cleaning with pre-impregnated wipes |
Wipes pre-impregnated with cleaning agents are used for manual cleaning. Cleaning agents may be solvent-based, low-volatility solvents or solvent-free. |
||||||
(d) |
Use of low-volatility cleaning agents |
Application of low-volatility solvents as cleaning agents, for manual or automated cleaning, with high cleaning power. |
||||||
(e) |
Water-based cleaning |
Water-based detergents or water-miscible solvents such as alcohols or glycols are used for cleaning. |
||||||
(f) |
Enclosed washing machines |
Automatic batch cleaning/degreasing of press/machine parts in enclosed washing machines. This can be done using either:
|
||||||
(g) |
Purging with solvent recovery |
Collection, storage and, if possible, reuse of the solvents used to purge the guns/applicators and lines between colour changes. |
||||||
(h) |
Cleaning with high-pressure water spray |
High-pressure water spray and sodium bicarbonate systems or similar are used for automatic batch cleaning of press/machine parts. |
||||||
(i) |
Ultrasonic cleaning |
Cleaning in a liquid using high-frequency vibrations to loosen the adhered contamination. |
||||||
(j) |
Dry ice (CO2) cleaning |
Cleaning of machinery parts and metallic or plastic substrates by blasting with CO2 chips or snow. |
||||||
(k) |
Plastic shot-blast cleaning |
Excess paint build-up is removed from panel jigs and body carriers by shot-blasting with plastic particles. |
1.1.9.
Monitoring
1.1.9.1.
Solvent mass balance
BAT 10.
BAT is to monitor total and fugitive VOC emissions by compiling, at least once every year, a solvent mass balance of the solvent inputs and outputs of the plant, as defined in Part 7(2) of Annex VII to Directive 2010/75/EU and to minimise the uncertainty of the solvent mass balance data by using all of the techniques given below.
Technique |
Description |
|||||||||
(a) |
Full identification and quantification of the relevant solvent inputs and outputs, including the associated uncertainty |
This includes:
|
||||||||
(b) |
Implementation of a solvent tracking system |
A solvent tracking system aims to keep control of both the used and unused quantities of solvents (e.g. by weighing unused quantities returned to storage from the application area). |
||||||||
(c) |
Monitoring of changes that may influence the uncertainty of the solvent mass balance data |
Any change that could influence the uncertainty of the solvent mass balance data is recorded, such as:
|
1.1.9.2.
Emissions in waste gases
BAT 11.
BAT is to monitor emissions in waste gases with at least the frequency given below and in accordance with EN standards. If EN standards are not available, BAT is to use ISO, national or other international standards that ensure the provision of data of an equivalent scientific quality.
Substance/Parameter |
Sectors/Sources |
Standard(s) |
Minimum monitoring frequency |
Monitoring associated with |
|
Dust |
Coating of vehicles – Spray coating |
EN 13284-1 |
Once every year(6) |
BAT 18 |
|
Coating of other metal and plastic surfaces – Spray coating |
|||||
Coating of aircraft – Preparation (e.g. sanding, blasting) and coating |
|||||
Coating and printing of metal packaging – Spray application |
|||||
Coating of wooden surfaces – Preparation and coating |
|||||
TVOC |
All sectors |
Any stack with a TVOC load < 10 kg C/h |
EN 12619 |
Once every year(6) (7) (8) |
BAT 14, BAT 15 |
Any stack with a TVOC load ≥ 10 kg C/h |
Generic EN standards(9) |
Continuous |
|||
DMF |
Coating of textiles, foils and paper(10) |
No EN standard available(11) |
Once every three months(6) |
BAT 15 |
|
NOX |
Thermal treatment of off-gases |
EN 14792 |
Once every year(12) |
BAT 17 |
|
CO |
Thermal treatment of off-gases |
EN 15058 |
Once every year(12) |
BAT 17 |
1.1.9.3.
Emissions to water
BAT 12.
BAT is to monitor emissions to water with at least the frequency given below and in accordance with EN standards. If EN standards are not available, BAT is to use ISO, national or other international standards that ensure the provision of data of an equivalent scientific quality.
Substance/Parameter |
Sector |
Standard(s) |
Minimum monitoring frequency |
Monitoring associated with |
TSS(13) |
Coating of vehicles |
EN 872 |
Once every month(14) (15) |
BAT 21 |
Coil coating |
||||
Coating and printing of metal packaging (only for DWI cans) |
||||
COD(13) (16) |
Coating of vehicles |
No EN standard available |
||
Coil coating |
||||
Coating and printing of metal packaging (only for DWI cans) |
||||
TOC(13) (16) |
Coating of vehicles |
EN 1484 |
||
Coil coating |
||||
Coating and printing of metal packaging (only for DWI cans) |
||||
Cr(VI)(17) (18) |
Coating of aircraft |
EN ISO 10304-3 or EN ISO 23913 |
||
Coil coating |
||||
Cr(18) (19) |
Coating of aircraft |
Various EN standards available (e.g. EN ISO 11885, EN ISO 17294-2, EN ISO 15586) |
||
Coil coating |
||||
Ni(18) |
Coating of vehicles |
|||
Coil coating |
||||
Zn(18) |
Coating of vehicles |
|||
Coil coating |
||||
AOX(18) |
Coating of vehicles |
EN ISO 9562 |
||
Coil coating |
||||
Coating and printing of metal packaging (only for DWI cans) |
||||
F- (18) (20) |
Coating of vehicles |
EN ISO 10304-1 |
||
Coil coating |
||||
Coating and printing of metal packaging (only for DWI cans) |
1.1.10.
Emissions during OTNOC
BAT 13.
In order to reduce the frequency of the occurrence of OTNOC and to reduce emissions during OTNOC, BAT is to use both of the techniques given below.
Technique |
Description |
|
(a) |
Identification of critical equipment |
Equipment critical to the protection of the environment (‘critical equipment’) is identified on the basis of a risk assessment. In principle, this concerns all equipment and systems handling VOCs (e.g. off-gas treatment system, leak detection system). |
(b) |
Inspection, maintenance and monitoring |
A structured programme to maximise critical equipment availability and performance which includes standard operating procedures, preventive maintenance, regular and unplanned maintenance. OTNOC periods, duration, causes and, if possible, emissions during their occurrence are monitored. |
1.1.11.
Emissions in waste gases
1.1.11.1.
VOC emissions
BAT 14.
In order to reduce VOC emissions from the production and storage areas, BAT is to use technique (a) and an appropriate combination of the other techniques given below.
Technique |
Description |
Applicability |
|||||||||||||||||||||
(a) |
System selection, design and optimisation |
An off-gas system is selected, designed and optimised taking into account parameters such as:
The following order of priority for the system selection may be considered:
|
Generally applicable. |
||||||||||||||||||||
(b) |
Air extraction as close as possible to the point of application of VOC-containing materials |
Air extraction as close as possible to the point of application with full or partial enclosure of solvent application areas (e.g. coaters, application machines, spray booths). Extracted air may be treated by an off-gas treatment system. |
May not be applicable where enclosure leads to difficult machinery access during operation. Applicability may be restricted by the shape and size of the area to be enclosed. |
||||||||||||||||||||
(c) |
Air extraction as close as possible to the point of preparing paints/coatings/adhesives/inks |
Air extraction as close as possible to the point of preparing paints/coatings/adhesives/inks (e.g. mixing area). Extracted air may be treated by an off-gas treatment system. |
Only applicable where paints/coatings/adhesives/inks are prepared. |
||||||||||||||||||||
(d) |
Extraction of air from the drying/curing processes |
The curing ovens/dryers are equipped with an air extraction system. Extracted air may be treated by an off-gas treatment system. |
Only applicable to drying/curing processes. |
||||||||||||||||||||
(e) |
Minimisation of fugitive emissions and heat losses from the ovens/dryers either by sealing the entrance and the exit of the curing ovens/dryers or by applying sub-atmospheric pressure in drying |
The entrance to and the exit from curing ovens/dryers are sealed to minimise fugitive VOC emissions and heat losses. The sealing may be ensured by air jets or air knives, doors, plastic or metallic curtains, doctor blades, etc. Alternatively, ovens/dryers are kept under sub-atmospheric pressure. |
Only applicable when curing ovens/dryers are used. |
||||||||||||||||||||
(f) |
Extraction of air from the cooling zone |
When substrate cooling takes place after drying/curing, the air from the cooling zone is extracted and may be treated by an off-gas treatment system. |
Only applicable when substrate cooling takes place after drying/curing. |
||||||||||||||||||||
(g) |
Extraction of air from storage of raw materials, solvents and solvent-containing wastes |
Air from raw material stores and/or individual containers for raw materials, solvents and solvent-containing wastes is extracted and may be treated by an off-gas treatment system. |
May not be applicable for closed containers or for storage of raw materials, solvents and solvent-containing wastes with a low vapour pressure and low toxicity. |
||||||||||||||||||||
(h) |
Extraction of air from cleaning areas |
Air from the areas where machine parts and equipment are cleaned with organic solvents, either by hand or automatically, is extracted and may be treated by an off-gas treatment system. |
Only applicable to areas where machine parts and equipment are cleaned with organic solvents. |
BAT 15.
In order to reduce VOC emissions in waste gases and increase resource efficiency, BAT is to use one or a combination of the techniques given below.
Technique |
Description |
Applicability |
|
I. Capture and recovery of solvents in off-gases |
|||
(a) |
Condensation |
A technique for removing organic compounds by reducing the temperature below their dew points so that the vapours liquefy. Depending on the operating temperature range required, different refrigerants are used, e.g. cooling water, chilled water (temperature typically around 5 °C), ammonia or propane. |
Applicability may be restricted where the energy demand for recovery is excessive due to the low VOC content. |
(b) |
Adsorption using activated carbon or zeolites |
VOCs are adsorbed on the surface of activated carbon, zeolites or carbon fibre paper. Adsorbate is subsequently desorbed, e.g. with steam (often on site), for reuse or disposal and the adsorbent is reused. For continuous operation, typically more than two adsorbers are operated in parallel, one of them in desorption mode. Adsorption is also commonly applied as a concentration step to increase the subsequent oxidation efficiency. |
Applicability may be restricted where the energy demand for recovery is excessive due to the low VOC content. |
(c) |
Absorption using a suitable liquid |
Use of a suitable liquid to remove pollutants from the off-gas by absorption, in particular soluble compounds and solids (dust). Solvent recovery is possible, for example, using distillation or thermal desorption. (For dust removal, see BAT 18.) |
Generally applicable. |
II. Thermal treatment of solvents in off-gases with energy recovery |
|||
(d) |
Sending off-gases to a combustion plant |
Part or all of the off-gases are sent as combustion air and supplementary fuel to a combustion plant (including CHP (combined heat and power) plants) used for steam and/or electricity production. |
Not applicable for off-gases containing substances referred to in IED Article 59(5). Applicability may be restricted due to safety considerations. |
(e) |
Recuperative thermal oxidation |
Thermal oxidation using the heat of the waste gases, e.g. to preheat the incoming off-gases. |
Generally applicable. |
(f) |
Regenerative thermal oxidation with multiple beds or with a valveless rotating air distributor |
An oxidiser with multiple beds (three or five) filled with ceramic packing. The beds are heat exchangers, alternately heated by flue-waste gases from oxidation, then the flow is reversed to heat the inlet air to the oxidiser. The flow is reversed on a regular basis. In the valveless rotating air distributor, the ceramic medium is held in a single rotating vessel divided into multiple wedges. |
Generally applicable. |
(g) |
Catalytic oxidation |
Oxidation of VOCs assisted by a catalyst to reduce the oxidation temperature and reduce the fuel consumption. Exhaust heat can be recovered with recuperative or regenerative types of heat exchangers. Higher oxidation temperatures (500–750 °C) are used for the treatment of off-gas from the manufacturing of winding wire. |
Applicability may be restricted by the presence of catalyst poisons. |
III. Treatment of solvents in off-gases without solvent or energy recovery |
|||
(h) |
Biological off-gas treatment |
Off-gas is dedusted and sent to a reactor with biofilter substrate. The biofilter consists of a bed of organic material (such as peat, heather, compost, root, tree bark, softwood and different combinations) or some inert material (such as clay, activated carbon, and polyurethane), where the off-gas stream is biologically oxidised by naturally occurring microorganisms into carbon dioxide, water, inorganic salts and biomass. The biofilter is sensitive to dust, high temperatures or high variations in the off-gas, e.g. of the inlet temperature or the VOC concentration. Supplementary nutrient feeding may be needed. |
Only applicable to the treatment of biodegradable solvents. |
(i) |
Thermal oxidation |
Oxidation of VOCs by heating off-gases with air or oxygen to above their auto-ignition point in a combustion chamber and maintaining a high temperature long enough to complete the combustion of VOCs to carbon dioxide and water. |
Generally applicable. |
BAT 16.
In order to reduce the energy consumption of the VOC abatement system, BAT is to use one or a combination of the techniques given below.
Technique |
Description |
Applicability |
|||||||||
(a) |
Maintaining the VOC concentration sent to the off-gas treatment system by using variable-frequency drive fans |
Use of a variable-frequency drive fan with centralised off-gas treatment systems to modulate the airflow to match the exhaust from the equipment that may be in operation. |
Only applicable to central thermal off-gas treatment systems in batch processes such as printing. |
||||||||
(b) |
Internal concentration of solvents in the off-gases |
Off-gases are recirculated within the process (internally) in the curing ovens/dryers and/or in spray booths, so the VOC concentration in the off-gases increases and the abatement efficiency of the off-gas treatment system increases. |
Applicability may be limited by health and safety factors such as the LEL, and product quality requirements or specifications. |
||||||||
(c) |
External concentration of solvents in the off-gases through adsorption |
The concentration of solvent in off-gases is increased by a continuous circular flow of the spray booth process air, possibly combined with curing oven/dryer off-gases, through adsorption equipment. This equipment can include:
|
Applicability may be restricted where the energy demand is excessive due to the low VOC content. |
||||||||
(d) |
Plenum technique to reduce waste gas volume |
Off-gases from curing ovens/dryers are sent to a large chamber (plenum), and partly recirculated as inlet air in the curing ovens/dryers. The surplus air from the plenum is sent to the off-gas treatment system. This cycle increases the VOC content of the curing ovens/dryers’ air and decreases the waste gas volume. |
Generally applicable. |
1.1.11.2.
NO
X
and CO emissions
BAT 17.
In order to reduce NO
X
emissions in waste gases while limiting CO emissions from the thermal treatment of solvents in off-gases, BAT is to use technique (a) or both of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Optimisation of thermal treatment conditions (design and operation) |
Good design of the combustion chambers, burners and associated equipment/devices is combined with optimisation of combustion conditions (e.g. by controlling combustion parameters such as temperature and residence time) with or without the use of automatic systems and the regular planned maintenance of the combustion system according to suppliers’ recommendations. |
Design applicability may be restricted for existing plants. |
(b) |
Use of low-NOX burners |
The peak flame temperature in the combustion chamber is reduced, delaying but completing the combustion and increasing the heat transfer (increased emissivity of the flame). It is combined with increased residence time in order to achieve the desired VOC destruction. |
Applicability may be restricted at existing plants by design and/or operational constraints. |
Parameter |
Unit |
BAT-AEL(21) (Daily average or average over the sampling period) |
Indicative emission level(21) (Daily average or average over the sampling period) |
NOX |
mg/Nm3 |
20–130(22) |
No indicative level |
CO |
No BAT-AEL |
20–150 |
1.1.11.3.
Dust emissions
BAT 18.
In order to reduce dust emissions in waste gases from substrate surface preparation, cutting, coating application and finishing processes for the sectors and processes listed in Table 2, BAT is to use one or a combination of the techniques given below.
Technique |
Description |
|
(a) |
Wet separation spray booth (flushed impact panel) |
A water curtain cascading vertically down the spray cabin rear panel captures paint particles from overspray. The water-paint mixture is captured in a reservoir and the water is recirculated. |
(b) |
Wet scrubbing |
Paint particles and other dust in the off-gas are separated in scrubber systems by intensive mixing of the off-gas with water. (For VOC removal, see BAT 15 (c).) |
(c) |
Dry overspray separation with pre-coated material |
A dry paint overspray separation process using membrane filters combined with limestone as pre-coating material to prevent fouling of the membranes. |
(d) |
Dry overspray separation using filters |
Mechanical separation system, e.g. using cardboard, fabric or sinter. |
(e) |
Electrostatic precipitator |
In electrostatic precipitators, particles are charged and separated under the influence of an electrical field. In a dry electrostatic precipitator (ESP), the collected material is mechanically removed (e.g. by shaking, vibration, compressed air). In a wet ESP, it is flushed with a suitable liquid, usually a water-based separation agent. |
Parameter |
Sector |
Process |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
Dust |
Coating of vehicles |
Spray coating |
mg/Nm3 |
< 1–3 |
Coating of other metal and plastic surfaces |
Spray coating |
|||
Coating of aircraft |
Preparation (e.g. sanding, blasting), coating |
|||
Coating and printing of metal packaging |
Spray application |
|||
Coating of wooden surfaces |
Preparation, coating |
1.1.12.
Energy efficiency
BAT 19.
In order to use energy efficiently, BAT is to use techniques (a) and (b) and an appropriate combination of the techniques (c) to (h) given below.
Technique |
Description |
Applicability |
||||||||
Management techniques |
||||||||||
(a) |
Energy efficiency plan |
An energy efficiency plan is part of the EMS (see BAT 1) and entails defining and calculating the specific energy consumption of the activity, setting key performance indicators on an annual basis (e.g. MWh/tonne of product) and planning the periodic improvement targets and related actions. The plan is adapted to the specificities of the plant in terms of process(es) carried out, materials, products, etc. |
The level of detail and nature of the energy efficiency plan and of the energy balance record will generally be related to the nature, scale and complexity of the installation and the types of energy sources used. It may not be applicable if the STS activity is carried out within a larger installation, provided that the energy efficiency plan and the energy balance record of the larger installation sufficiently cover the STS activity. |
|||||||
(b) |
Energy balance record |
The drawing up once every year of an energy balance record which provides a breakdown of the energy consumption and generation (including energy export) by the type of source (e.g. electricity, fossil fuels, renewable energy, imported heat and/or cooling). This includes:
The energy balance record is adapted to the specificities of the plant in terms of process(es) carried out, materials, etc. |
||||||||
Process-related techniques |
||||||||||
(c) |
Thermal insulation of tanks and vats containing cooled or heated liquids, and of combustion and steam systems |
This may be achieved for example by:
|
Generally applicable. |
|||||||
(d) |
Heat recovery by cogeneration – CHP (combined heat and power) or CCHP (combined cooling, heat and power) |
Recovery of heat (mainly from the steam system) for producing hot water/steam to be used in industrial processes/activities. CCHP (also called tri-generation) is a cogeneration system with an absorption chiller that uses low-grade heat to produce chilled water. |
Applicability may be restricted by the plant layout, the characteristics of the hot gas streams (e.g. flow rate, temperature) or the lack of a suitable heat demand. |
|||||||
(e) |
Heat recovery from hot gas streams |
Energy recovery from hot gas streams (e.g. from dryers or cooling zones), e.g. by their recirculation as process air, through the use of heat exchangers, in processes, or externally. |
||||||||
(f) |
Flow adjustment of process air and off-gases |
Adjustment of the flow of process air and off-gases according to the need. This includes reduction of air ventilation during idle operation or maintenance. |
Generally applicable. |
|||||||
(g) |
Spray booth off-gas recirculation |
Capture and recirculation of the off-gas from the spray booth in combination with efficient paint overspray separation. Energy consumption is less than in the case of fresh air use. |
Applicability may be restricted by health and safety considerations. |
|||||||
(h) |
Optimised circulation of warm air in a large-volume curing booth using an air turbulator |
Air is blown into a single part of the curing booth and distributed using an air turbulator which turns the laminar airflow into the desired turbulent flow. |
Only applicable to spray coating sectors. |
Sector |
Product type |
Unit |
BAT-AEPL (Yearly average) |
Coating of vehicles |
Passenger cars |
MWh/vehicle coated |
0,5–1,3 |
Vans |
0,8–2 |
||
Truck cabins |
1–2 |
||
Trucks |
0,3–0,5 |
||
Coil coating |
Steel and/or aluminium coil |
kWh/m2 of coated coil |
0,2–2,5(23) |
Coating of textiles, foils and paper |
Coating of textiles with polyurethane and/or polyvinyl chloride |
kWh/m2 of coated surface |
1–5 |
Manufacturing of winding wires |
Wires with an average diameter > 0,1 mm |
kWh/kg of coated wire |
< 5 |
Coating and printing of metal packaging |
All product types |
kWh/m2 of coated surface |
0,3–1,5 |
Heatset web offset printing |
All product types |
Wh/m2 of printed area |
4–14 |
Flexography and non-publication rotogravure printing |
All product types |
Wh/m2 of printed area |
50–350 |
Publication rotogravure printing |
All product types |
Wh/m2 of printed area |
10–30 |
1.1.13.
Water use and waste water generation
BAT 20.
In order to reduce water consumption and waste water generation from aqueous processes (e.g. degreasing, cleaning, surface treatment, wet scrubbing), BAT is to use technique (a) and an appropriate combination of the other techniques given below.
Technique |
Description |
Applicability |
|||||||
(a) |
Water management plan and water audits |
A water management plan and water audits are part of the EMS (see BAT 1) and include:
Water audits are carried out at least once every year. |
The level of detail and nature of the water management plan and water audits will generally be related to the nature, scale and complexity of the plant. It may not be applicable if the STS activity is carried out within a larger installation, provided that the water management plan and the water audits of the larger installation sufficiently cover the STS activity. |
||||||
(b) |
Reverse cascade rinsing |
Multiple stage rinsing in which the water flows in the opposite direction to the work-pieces/substrate. It allows a high degree of rinsing with a low water consumption. |
Applicable where rinsing processes are used. |
||||||
(c) |
Reuse and/or recycling of water |
Water streams (e.g. spent rinse water, wet scrubber effluent) are reused and/or recycled, if necessary after treatment, using techniques such as ion exchange or filtration (see BAT 21). The degree of water reuse and/or recycling is limited by the water balance of the plant, the content of impurities and/or the characteristics of the water streams. |
Generally applicable. |
Sector |
Product type |
Unit |
BAT-AEPL (Yearly average) |
Coating of vehicles |
Passenger cars |
m3/vehicle coated |
0,5–1,3 |
Vans |
1–2,5 |
||
Truck cabins |
0,7–3 |
||
Trucks |
1–5 |
||
Coil coating |
Steel and/or aluminium coils |
l/m2 of coated coil |
0,2–1,3 (24) |
Coating and printing of metal packaging |
Two-piece DWI beverage cans |
l/1 000 cans |
90–110 |
1.1.14.
Emissions to water
BAT 21.
In order to reduce emissions to water and/or to facilitate water reuse and recycling from aqueous processes (e.g. degreasing, cleaning, surface treatment, wet scrubbing), BAT is to use a combination of the techniques given below.
Techniques |
Description |
Typical pollutants targeted |
|
Preliminary, primary and general treatment |
|||
(a) |
Equalisation |
Balancing of flows and pollutant loads by using tanks or other management techniques. |
All pollutants. |
(b) |
Neutralisation |
The adjustment of the pH of waste water to a neutral value (approximately 7). |
Acids, alkalis. |
(c) |
Physical separation, for example, by using screens, sieves, grit separators, primary settlement tanks and magnetic separation |
Gross solids, suspended solids, metal particles. |
|
Physico-chemical treatment |
|||
(d) |
Adsorption |
The removal of soluble substances (solutes) from the waste water by transferring them to the surface of solid, highly porous particles (typically activated carbon). |
Adsorbable dissolved non-biodegradable or inhibitory pollutants, e.g. AOX. |
(e) |
Vacuum distillation |
The removal of pollutants by thermal waste water treatment under reduced pressure. |
Dissolved non-biodegradable or inhibitory pollutants that can be distilled, e.g. some solvents. |
(f) |
Precipitation |
The conversion of dissolved pollutants into insoluble compounds by adding precipitants. The solid precipitates formed are subsequently separated by sedimentation, flotation or filtration. |
Precipitable dissolved non-biodegradable or inhibitory pollutants, e.g. metals. |
(g) |
Chemical reduction |
Chemical reduction is the conversion of pollutants by chemical reducing agents into similar but less harmful or hazardous compounds. |
Reducible dissolved non-biodegradable or inhibitory pollutants, e.g. hexavalent chromium (Cr(VI)). |
(h) |
Ion exchange |
The retention of ionic pollutants from waste water and their replacement by more acceptable ions using an ion exchange resin. The pollutants are temporarily retained and afterwards released into a regeneration or backwashing liquid. |
Ionic dissolved non-biodegradable or inhibitory pollutants, e.g. metals. |
(i) |
Stripping |
The removal of purgeable pollutants from the aqueous phase by a gaseous phase (e.g. steam, nitrogen or air) that is passed through the liquid. The removal efficiency may be enhanced by increasing the temperature or reducing the pressure. |
Purgeable pollutants, e.g. some adsorbable organically bound halogens (AOX). |
Biological treatment |
|||
(j) |
Biological treatment |
Use of microorganisms for waste water treatment (e.g. anaerobic treatment, aerobic treatment). |
Biodegradable organic compounds. |
Final solids removal |
|||
(k) |
Coagulation and flocculation |
Coagulation and flocculation are used to separate suspended solids from waste water and are often carried out in successive steps. Coagulation is carried out by adding coagulants with charges opposite to those of the suspended solids. Flocculation is a gentle mixing stage so that collisions of microfloc particles cause them to bond to produce larger flocs. It may be assisted by adding polymers. |
Suspended solids and particulate-bound metals. |
(l) |
Sedimentation |
The separation of suspended particles by gravitational settling. |
|
(m) |
Filtration |
The separation of solids from waste water by passing them through a porous medium, e.g. sand filtration, nano-, micro- and ultrafiltration |
|
(n) |
Flotation |
The separation of solid or liquid particles from waste water by attaching them to fine gas bubbles, usually air. The buoyant particles accumulate at the water surface and are collected with skimmers. |
Substance/Parameter |
Sector |
BAT-AEL(25) |
Total suspended solids (TSS) |
Coating of vehicles Coil coating Coating and printing of metal packaging (only for DWI cans) |
5–30 mg/l |
Chemical oxygen demand (COD)(26) |
30–150 mg/l |
|
Adsorbable organically bound halogens (AOX) |
0,1–0,4 mg/l |
|
Fluoride (F-)(27) |
2–25 mg/l |
|
Nickel (expressed as Ni) |
Coating of vehicles Coil coating |
0,05–0,4 mg/l |
Zinc (expressed as Zn) |
0,05–0,6 mg/l(28) |
|
Total chromium (expressed as Cr)(29) |
Coating of aircraft Coil coating |
0,01–0,15 mg/l |
Hexavalent chromium (expressed as Cr(VI))(30) |
0,01–0,05 mg/l |
Substance/Parameter |
Sector |
BAT-AEL(31) (32) |
Adsorbable organically bound halogens (AOX) |
Coating of vehicles Coil coating Coating and printing of metal packaging (only for DWI cans) |
0,1–0,4 mg/l |
Fluoride (F-)(33) |
2–25 mg/l |
|
Nickel (expressed as Ni) |
Coating of vehicles Coil coating |
0,05–0,4 mg/l |
Zinc (expressed as Zn) |
0,05–0,6 mg/l(34) |
|
Total chromium (expressed as Cr)(35) |
Coating of aircraft Coil coating |
0,01–0,15 mg/l |
Hexavalent chromium (expressed as Cr(VI))(36) |
0,01–0,05 mg/l |
1.1.15.
Waste management
BAT 22.
In order to reduce the quantity of waste sent for disposal, BAT is to use the techniques (a) and (b) and one or both of the techniques (c) and (d) given below.
Technique |
Description |
|||||||||
(a) |
Waste management plan |
A waste management plan is part of the EMS (see BAT 1) and is a set of measures aiming to: 1) minimise the generation of waste, 2) optimise the reuse, regeneration and/or recycling of waste and/or the recovery of energy from waste, and 3) ensure the proper disposal of waste. |
||||||||
(b) |
Monitoring of waste quantities |
Annual recording of waste quantities generated for each type of waste. The solvent content in the waste is determined periodically (at least once every year) by analysis or calculation. |
||||||||
(c) |
Recovery/recycling of solvents |
Techniques may include:
|
||||||||
(d) |
Waste-stream-specific techniques |
Techniques may include:
|
1.1.16.
Odour emissions
BAT 23.
In order to prevent or, where that is not practicable, to reduce odour emissions, BAT is to set up, implement and regularly review an odour management plan, as part of the environmental management system (see BAT 1), that includes all of the following elements:
Applicability
1.2.
BAT conclusions for the coating of vehicles
1.2.1.
VOC emissions and energy and raw material consumption
BAT 24.
In order to reduce the consumption of solvents, other raw materials and energy, as well as to reduce VOC emissions, BAT is to use one or a combination of the coating systems given below.
Coating system |
Description |
Applicability |
|
(a) |
Mixed (SB-mix) coating |
A coating system where one coating layer (primer or base coat) is water-based. |
Only applicable to new plants or major plant upgrades. |
(b) |
Water-based (WB) coating |
A coating system where the primer and base coat layers are water-based. |
|
(c) |
Integrated coating process |
A coating system which combines the functions of primer and base coat and is applied by spray coating in two steps. |
|
(d) |
Three-wet process |
Coating system where the primer, base coat and clear coat layers are applied without intermediate drying. The primer and base coat may be solvent-based or water-based. |
Parameter |
Vehicle type |
Unit |
BAT-AEL(37) (Yearly average) |
|
New plant |
Existing plant |
|||
Total VOC emissions as calculated by the solvent mass balance |
Passenger cars |
g VOCs per m2 of surface area(38) |
8–15 |
8–30 |
Vans |
10–20 |
10–40 |
||
Truck cabins |
8–20 |
8–40 |
||
Trucks |
10–40 |
10–50 |
||
Buses |
< 100 |
90–150 |
1.2.2.
Waste quantity sent off site
Parameter |
Vehicle type |
Relevant waste streams |
Unit |
Indicative level (Yearly average) |
||||||||||
Waste quantity sent off site |
Passenger cars |
|
kg/vehicle coated |
3–9(39) |
||||||||||
Vans |
4–17(39) |
|||||||||||||
Truck cabins |
2–11(39) |
1.3.
BAT conclusions for the coating of other metal and plastic surfaces
Parameter |
Process |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
Coating of metal surfaces |
kg VOCs per kg of solid mass input |
< 0,05–0,2 |
Coating of plastic surfaces |
< 0,05–0,3 |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 1–10 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
1–20(40) (41) |
1.4.
BAT conclusions for the coating of ships and yachts
BAT 25.
In order to reduce total emissions of VOCs and dust emissions to air, to reduce emissions to water and to improve the overall environmental performance, BAT is to use techniques (a) and (b) and a combination of techniques (c) to (i) given below.
Technique |
Description |
Applicability |
|||||
Waste and waste water management |
|||||||
(a) |
Segregation of waste and waste water streams |
Docks and slipways are constructed with:
|
Only applicable to new plants or major plant upgrades. |
||||
Techniques relating to preparation and coating processes |
|||||||
(b) |
Restrictions for adverse weather conditions |
Where the treatment areas are not fully enclosed, blasting and/or airless spray coating are not carried out if adverse weather conditions are observed or forecast. |
Generally applicable. |
||||
(c) |
Partial enclosure of treatment areas |
Fine nets and/or water spray curtains are used around areas where blasting and/or airless spray coating are carried out to prevent dust emissions. They may be permanent or temporary. |
Applicability may be restricted by the shape and size of the area to be enclosed. Water spray curtains may not be applicable in cold climatic conditions. |
||||
(d) |
Full enclosure of treatment areas |
Blasting and/or airless spray coating are carried out in halls, closed workshops, areas tented with textiles or areas fully enclosed with nets to prevent dust emissions. Air from the treatment areas is extracted and may be sent to off-gas treatment; see also BAT 14 (b). |
Applicability may be restricted by the shape and size of the area to be enclosed. |
||||
(e) |
Dry blasting in a closed system |
Dry blasting using steel grit or shot is carried out in closed blasting systems equipped with a suction head and centrifugal blasting wheels. |
Generally applicable. |
||||
(f) |
Wet blasting |
Blasting is carried out with water containing a fine abrasive material, such as a fine cinder (e.g. copper slag cinder) or silica. |
May not be applicable in cold climatic conditions and/or in enclosed areas (cargo tanks, double bottom tanks) due to the heavy mist formation. |
||||
(g) |
(Ultra-)High-Pressure ((U)HP) water jetting or blasting |
(U)HP blasting is a dustless surface treatment method using extremely high-pressure water. There are options with or without an abrasive. |
May not be applicable in cold climatic conditions, or due to surface specifications (e.g. new surfaces, spot blasting). |
||||
(h) |
Stripping of coatings by induction heating |
An inductor head is moved over the surface, causing localised fast heating of the steel to lift old coatings. |
May not be applicable for surfaces with a thickness of less than 5 mm and/or for surfaces with components sensitive to induction heating (e.g. insulation, flammable). |
||||
(i) |
Underwater hull and propeller cleaning system |
Underwater cleaning system using water pressure and rotating polypropylene brushes. |
Not applicable for ships in full dry dock. |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
kg VOCs per kg of solid mass input |
< 0,375 |
1.5.
BAT conclusions for the coating of aircraft
BAT 26:
In order to reduce total emissions of VOCs and to improve the overall environmental performance of coating of aircraft, BAT is to use technique (a) or both of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Enclosure |
Component parts are coated in enclosed spray booths (see BAT 14 (b)). |
Generally applicable. |
(b) |
Direct printing |
Use of a printing device to directly print complex layouts on the aircraft parts. |
Applicability may be restricted by technical considerations (e.g. accessibility of the applicator gantry, customised colours). |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
kg VOCs per kg of solid mass input |
0,2–0,58 |
1.6.
BAT conclusions for coil coating
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 1–3 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
1–20(42) (43) |
1.7.
BAT conclusions for the manufacturing of adhesive tapes
Parameter |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 1–3(44) |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
2–20(45) (46) |
1.8.
BAT conclusions for the coating of textiles, foils and paper
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 1–5 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
5–20(47) (48) |
1.9.
BAT conclusions for the manufacturing of winding wire
BAT 27.
In order to reduce total emissions of VOCs and energy consumption, BAT is to use technique (a) and one or a combination of the techniques (b) to (d) given below.
Technique |
Description |
Applicability |
|||||
(a) |
Process-integrated VOC oxidation |
The air/solvent mix resulting from solvent evaporation during the repeated enamel curing process is treated in a catalytic oxidiser (see BAT 15 (g)) integrated in the curing oven/dryer. The waste heat from the catalytic oxidiser is used in the drying process to heat up the circulating airflow and/or as process heat for other purposes within the plant. |
Generally applicable. |
||||
(b) |
Solvent-free lubricants |
Solvent-free lubricants are applied as follows:
|
Applicability may be limited due to product quality requirements or specifications, e.g. diameter. |
||||
(c) |
Self-lubricating coatings |
A solvent-containing lubrication step is avoided by using a coating system that also contains lubricant (a special wax). |
Applicability may be limited due to product quality requirements or specifications. |
||||
(d) |
High-solids enamel coating |
Use of enamel coating with a solids content of up to 45 %. In the case of fine wires (with a diameter less than or equal to 0.1 mm), the solids content is up to 30 %. |
Parameter |
Product type |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
Coating of winding wire with an average diameter greater than 0,1 mm |
g VOCs per kg of coated wire |
1–3,3 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
5–40 |
1.10.
BAT conclusions for the coating and printing of metal packaging
Parameter |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
g VOCs per m2 of coated/printed surface |
< 1–3,5 |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 1–12 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
1–20(49) |
1.11.
BAT conclusions for heatset web offset printing
BAT 28.
In order to reduce total VOC emissions, BAT is to use a combination of the techniques given below.
Technique |
Description |
Applicability |
|
Material-based and printing techniques |
|||
(a) |
Use of low-IPA or IPA-free additives in dampening solutions |
Reduction or avoidance of isopropanol (IPA) as a wetting agent in dampening solutions, through substitution by mixtures of other organic compounds which are not volatile or have a low volatility. |
Applicability may be limited by technical and product quality requirements or specifications. |
(b) |
Waterless offset |
Modification of the press and the pre-press processes to enable the use of specially coated offset plates, eliminating the need for dampening. |
May not be applicable for long print runs due to the need for more frequent changes of plates. |
Cleaning techniques |
|||
(c) |
Use of VOC-free solvents or solvents with low volatility for automatic blanket cleaning |
Use of organic compounds which are not volatile or have a low volatility as cleaning agents for automatic blanket cleaning. |
Generally applicable. |
Off-gas treatment techniques |
|||
(d) |
Web offset dryer integrated with off-gas treatment |
A web offset dryer with an integrated off-gas treatment unit, enabling incoming dryer air to be mixed with a part of the waste gases returned from the off-gas thermal treatment system. |
Applicable to new plants or major plant upgrades. |
(e) |
Extraction and treatment of air from the press room or the press encapsulation |
Routing of extracted air from the press room or the press encapsulation to the dryer. As a result, a part of the solvents evaporated in the press room or press encapsulation is abated by the thermal treatment (see BAT 15) downstream of the dryer. |
Generally applicable. |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
kg VOCs per kg of ink input |
< 0,01–0,04(50) |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 1–10(51) |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
1–15 |
1.12.
BAT conclusions for flexography and non-publication rotogravure printing
Parameter |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
kg VOCs per kg of solid mass input |
< 0,1–0,3 |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 1–12 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
1–20(52) (53) |
1.13.
BAT conclusions for publication rotogravure printing
BAT 29.
In order to reduce VOC emissions from publication rotogravure printing, BAT is to use a toluene recovery system based on adsorption and one or both of the techniques given below.
Technique |
Description |
|
(a) |
Use of retention inks |
Retention inks slow the formation of the dried film surface, which allows toluene to evaporate over a longer time and therefore more toluene to be released in the dryer and recovered by the toluene recovery system. |
(b) |
Automatic cleaning systems connected to the toluene recovery system |
Automated cylinder cleaning with air extraction to the toluene recovery system. |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 2,5 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
10–20 |
1.14.
BAT conclusions for the coating of wooden surfaces
Parameter |
Coated substrates |
Unit |
BAT-AEL (Yearly average) |
Total VOC emissions as calculated by the solvent mass balance |
Flat substrates |
kg VOCs per kg of solid mass input |
< 0.1 |
Other than flat substrates |
< 0.25 |
Parameter |
Unit |
BAT-AEL (Yearly average) |
Fugitive VOC emissions as calculated by the solvent mass balance |
Percentage (%) of the solvent input |
< 10 |
Parameter |
Unit |
BAT-AEL (Daily average or average over the sampling period) |
TVOC |
mg C/Nm3 |
5-20(54) |
2. BAT CONCLUSIONS FOR PRESERVATION OF WOOD AND WOOD PRODUCTS WITH CHEMICALS
2.1.
Environmental management systems
BAT 30.
In order to improve the overall environmental performance, BAT is to elaborate and implement an Environmental Management System (EMS) that incorporates all of the features (i) to (xx) of BAT 1 as well as the following specific features:
Note
Applicability
2.2.
Substitution of harmful/hazardous substances
BAT 31.
In order to prevent or reduce emissions of PAHs and/or solvents, BAT is to use water-based preservatives.
Description
Applicability
BAT 32.
In order to reduce the environmental risk posed by the use of treatment chemicals, BAT is to substitute treatment chemicals currently in use with less hazardous ones based on a regular (e.g. once every year) check aiming at identifying potentially new available and safer alternatives.
Applicability
2.3.
Resource efficiency
BAT 33.
In order to increase resource efficiency and to reduce the environmental impact and risk associated with the use of treatment chemicals, BAT is to reduce their consumption by using all of the techniques given below.
Technique |
Description |
Applicability |
|||||
(a) |
Use of an efficient preservative application system |
Application systems where the wood is immersed in the preservative solution are more efficient than, for example, spraying. The application efficiency of vacuum processes (closed system) is close to 100 %. The selection of the application system takes into account the use class and the penetration level needed. |
Only applicable to new plants or major plant upgrades. |
||||
(b) |
Control and optimisation of the consumption of the treatment chemicals for the specific end use |
Control and optimisation of the consumption of the treatment chemicals by:
The consumption of the treatment chemicals follows suppliers’ recommendations and does not lead to exceedances of the retention requirements (e.g. set in product quality standards). |
Generally applicable. |
||||
(c) |
Solvent mass balance |
The compilation, at least once every year, of organic solvent inputs and outputs of a plant as defined in Part 7(2) of Annex VII to Directive 2010/75/EU. |
Only applicable to plants using solvent-based treatment chemicals or creosote. |
||||
(d) |
Measurement and adjustment of wood moisture before treatment |
Wood moisture is measured prior to treatment (e.g. by measuring the electric resistance or by weighing) and adjusted if needed (e.g. by further seasoning of the wood) in order to optimise the impregnation process and ensure the required product quality. |
Only applicable if wood with a specific moisture content is needed. |
2.4.
Delivery, storage and handling of treatment chemicals
BAT 34.
In order to reduce emissions from delivery, storage and handling of treatment chemicals, BAT is to use technique (a) or (b) and all of the techniques (c) to (f) given below.
Technique |
Description |
|||||
(a) |
Back-venting |
Also referred to as vapour balancing. Vapours of solvents or creosote which are displaced from the receiving tank during filling are collected and returned to the tank or truck from which the liquid is delivered. |
||||
(b) |
Capture of displaced air |
Vapours of solvents or creosote which are displaced from the receiving tank during filling are collected and led to a treatment unit, e.g. an activated carbon filter or a thermal oxidation unit. |
||||
(c) |
Techniques to reduce evaporation losses due to heating up of stored chemicals |
When exposure to sunlight may lead to evaporation of solvents and creosote stored in above-ground storage tanks, tanks are covered by a roof or coated with light-coloured paint to reduce the heating up of stored solvents and creosote. |
||||
(d) |
Securing delivery connections |
Delivery connections to storage tanks located within the bunded/contained area are secured and shut off when not in use. |
||||
(e) |
Techniques to prevent overflows during pumping |
This includes ensuring that:
|
||||
(f) |
Closed storage containers |
Use of closed storage containers for treatment chemicals. |
2.5.
Preparation/conditioning of wood
BAT 35.
In order to reduce the consumption of treatment chemicals and the consumption of energy and to reduce emissions of treatment chemicals, BAT is to optimise the wood charge of the vessel and to avoid trapping of treatment chemicals by using a combination of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Separation of wood in packs by spacers |
Spacers are placed at regular intervals in the packs to facilitate the flow of treatment chemicals through the pack and the draining after treatment. |
Generally applicable. |
(b) |
Sloping of wood packs in traditional horizontal treatment vessels |
Wood packs are inclined in the treatment vessel to facilitate the flow of treatment chemicals and the draining after treatment. |
Generally applicable. |
(c) |
Use of tilting pressure treatment vessels |
The whole treatment vessel is inclined after treatment so that excess treatment chemicals drain easily and can be recovered from the bottom of the vessel. |
Only applicable to new plants or major plant upgrades. |
(d) |
Optimised positioning of shaped wood pieces |
Shaped wood pieces are positioned so as to prevent trapping of treatment chemicals. |
Generally applicable. |
(e) |
Securing wood packs |
The wood packs are secured inside the treatment vessel in order to limit the movement of wood pieces which could change the structure of the pack and reduce the impregnation efficiency. |
Generally applicable. |
(f) |
Maximisation of the wood load |
The wood load in the treatment vessel is maximised to ensure the best ratio between the wood to be treated and the treatment chemicals. |
Generally applicable. |
2.6.
Preservative application process
BAT 36.
In order to prevent accidental leakage and emissions of treatment chemicals from non-pressure processes, BAT is to use one of the techniques given below.
Technique |
|
(a) |
Double-walled treatment vessels with automatic leak detection devices |
(b) |
Single-walled treatment vessels with sufficiently large and wood-preservative-resistant containment, fender and automatic leak detection device |
BAT 37.
In order to reduce emissions of aerosols from wood and wood products preservation using water-based treatment chemicals, BAT is to enclose spraying processes, collect overspray and reuse it in the preparation of wood preservation solution.
BAT 38.
In order to prevent or reduce emissions of treatment chemicals from pressure processes (autoclaves), BAT is to use all of the techniques
given below.
Technique |
Description |
|
(a) |
Process controls to prevent operation unless the treatment vessel door is locked and sealed |
The treatment vessel door is locked and sealed once the treatment vessel is loaded and before treatment takes place. Process controls are in place that prevent the operation of the treatment vessel unless the door is locked and sealed. |
(b) |
Process controls to prevent the treatment vessel from opening while it is pressurised and/or filled with preservative solution |
Process controls display the pressure and whether liquid is present in the treatment vessel. They prevent the opening of the treatment vessel while it is still pressurised and/or filled. |
(c) |
Catch-lock for the treatment vessel door |
The door of the treatment vessel is equipped with a catch-lock to prevent the release of liquids in the event that the treatment vessel door needs to be opened in an emergency situation (e.g. door seal is broken). The catch-lock permits the door to be partially opened to release the pressure while retaining liquids. |
(d) |
Use and maintenance of safety relief valves |
Treatment vessels are fitted with safety relief valves to protect the vessels from excessive pressure. Discharges from valves are directed to a tank of sufficient capacity. Safety relief valves are regularly inspected (e.g. once every 6 months) for signs of corrosion, contamination or incorrect fitting and are cleaned and/or repaired as required. |
(e) |
Control of emissions to air from the vacuum pump exhaust |
Air extracted from pressure treatment vessels (i.e. the vacuum pump outlet) is treated (e.g. in a vapour-liquid separator). |
(f) |
Reduction of emissions to air when opening the treatment vessel |
Sufficient time for dripping and condensation is allowed between the depressurisation period and the opening of the treatment vessel. |
(g) |
Application of a final vacuum to remove excess treatment chemicals from the surface of treated wood |
To avoid dripping, a final vacuum is applied in the treatment vessel before opening it to remove excess treatment chemicals from the surface of treated wood. Application of a final vacuum may not be necessary if the removal of excess treatment chemicals from the surface of treated wood is ensured by the application of an appropriate initial vacuum (e.g. less than 50 mbar). |
BAT 39.
In order to reduce energy consumption in pressure processes (autoclaves), BAT is to use variable pump control.
Description
Applicability
2.7.
Post-treatment conditioning and interim storage
BAT 40.
In order to prevent or reduce the contamination of soil or groundwater from the interim storage of freshly treated wood, BAT is to allow sufficient dripping time after treatment and to remove the treated wood from the contained/bunded area only once it is deemed dry.
Description
2.8.
Waste management
BAT 41.
In order to reduce the quantity of waste sent for disposal, especially of hazardous waste, BAT is to use the techniques (a) and (b) and one or both of the techniques (c) and (d) given below.
Technique |
Description |
|
(a) |
Removal of debris prior to treatment |
Debris (e.g. sawdust, woodchips) is removed from the surface of the wood/wood products before treatment. |
(b) |
Recovery and reuse of waxes and oils |
When waxes or oils are used for impregnation, surplus waxes or oils from the impregnation process are recovered and reused. |
(c) |
Bulk delivery of treatment chemicals |
Delivery of treatment chemicals in tanks to reduce the amount of packaging. |
(d) |
Use of reusable containers |
Reusable containers used for treatment chemicals (e.g. intermediate bulk containers) are returned to the supplier for reuse. |
BAT 42.
In order to reduce the environmental risk related to waste management, BAT is to store waste in suitable containers or on sealed surfaces and to keep hazardous waste separately in a designated weather-protected and contained/bunded area.
2.9.
Monitoring
2.9.1.
Emissions to water
BAT 43.
BAT is to monitor pollutants in waste water and potentially contaminated surface run-off water prior to each batch discharge in accordance with EN standards. If EN standards are not available, BAT is to use ISO, national or other international standards that ensure the provision of data of an equivalent scientific quality.
Substance/Parameter |
Standard(s) |
Biocides(55) |
EN standards might be available depending on the composition of the biocidal products |
Cu(56) |
Various EN standards available (e.g. EN ISO 11885, EN ISO 17294-2, EN ISO 15586) |
Solvents(57) |
EN standards available for some solvents (e.g. EN ISO 15680) |
PAHs(58) |
EN ISO 17993 |
Benzo[a]pyrene(58) |
EN ISO 17993 |
HOI |
EN ISO 9377-2 |
2.9.2.
Groundwater quality
BAT 44.
BAT is to monitor pollutants in groundwater with a frequency of at least once every 6 months and in accordance with EN standards. If EN standards are not available, BAT is to use ISO, national or other international standards that ensure the provision of data of an equivalent scientific quality.
The monitoring frequency may be reduced to once every 2 years based on a risk assessment or if pollutant levels are proven to be sufficiently stable (e.g. after a period of 4 years).
Substance/Parameter(59) |
Standard(s) |
Biocides(60) |
EN standards might be available depending on the composition of the biocidal products |
As |
Various EN standards available (e.g. EN ISO 11885, EN ISO 17294-2, EN ISO 15586) |
Cu |
|
Cr |
|
Solvents(61) |
EN standards available for some solvents (e.g. EN ISO 15680) |
PAHs |
EN ISO 17993 |
Benzo[a]pyrene |
EN ISO 17993 |
HOI |
EN ISO 9377-2 |
2.9.3.
Emissions in waste gases
BAT 45.
BAT is to monitor emissions in waste gases with a frequency of at least once every year and in accordance with EN standards. If EN standards are not available, BAT is to use ISO, national or other international standards that ensure the provision of data of an equivalent scientific quality.
Parameter |
Process |
Standard(s) |
Monitoring associated with |
TVOC(62) |
Wood and wood products preservation using creosote and solvent-based treatment chemicals |
EN 12619 |
BAT 49, BAT 51 |
PAHs(62) (63) |
Wood and wood products preservation using creosote |
No EN standard available |
BAT 51 |
NOX (64) |
Wood and wood products preservation using creosote and solvent-based treatment chemicals |
EN 14792 |
BAT 52 |
CO(64) |
EN 15058 |
2.10.
Emissions to soil and groundwater
BAT 46.
In order to prevent or reduce emissions to soil and groundwater, BAT is to use all of the techniques given below.
Technique |
Description |
|||||||||||||
(a) |
Plant and equipment containment or bund |
The parts of the plant in which treatment chemicals are stored or handled, i.e. treatment chemicals storage area, treatment, post-treatment conditioning and interim storage areas (comprising treatment vessel, working vessel, unloading/pull-out facilities, dripping/drying area, cooling zone), pipes and ductwork for treatment chemicals, and creosote (re)conditioning facilities, are contained or bunded. Containments and bunds have impermeable surfaces, are resistant to treatment chemicals and have sufficient capacity to capture and hold the volumes handled or stored in the plant/equipment. Drip trays (made of treatment-chemical-resistant material) may also be used as local containments for the collection and recovery of drips and spills of treatment chemicals from critical equipment or processes (i.e. valves, inlets/outlets of storage tanks, treatment vessels, working tanks, unloading/pull-out zones, handling of freshly treated wood, cooling/drying zone). The liquids in the containments/bunds and drip trays are collected to recover the treatment chemicals for their reuse in the treatment chemicals system. Sludge generated in the collection system is disposed of as hazardous waste. |
||||||||||||
(b) |
Impermeable floors |
Floors of areas which are not contained or bunded, and where drips, spills, accidental releases or leaching of treatment chemicals may occur are impermeable to the substances concerned (e.g. storage of treated wood on impermeable floors in the event that it is required in the BPR authorisation for the wood preservative used for the treatment). The liquids on the floors are collected to recover the treatment chemicals for their reuse in the treatment chemicals system. Sludge generated in the collection system is disposed of as hazardous waste. |
||||||||||||
(c) |
Warning systems for equipment identified as ‘critical’ |
‘Critical’ equipment (see BAT 30) is equipped with warning systems to indicate malfunctions. |
||||||||||||
(d) |
Prevention and detection of leaks from underground storage and ductwork for harmful/hazardous substances and record-keeping |
The use of underground components is minimised. When underground components are used for the storage of harmful/hazardous substances, secondary containment (e.g. double-walled containment) is put in place. Underground components are equipped with leak detection devices. Risk-based and regular monitoring of underground storage and ductwork is carried out to identify potential leakages; when necessary, leaking equipment is repaired. A record is kept of incidents that may cause soil and/or groundwater pollution. |
||||||||||||
(e) |
Regular inspection and maintenance of plant and equipment |
The plant and the equipment are regularly inspected and serviced to ensure proper functioning; this includes in particular checking the integrity and/or leak-free status of valves, pumps, pipes, tanks, pressure vessels, drip trays, and containments/bunds and the proper functioning of warning systems. |
||||||||||||
(f) |
Techniques to prevent cross-contamination |
Cross-contamination (i.e. the contamination of plant areas that usually do not come into contact with treatment chemicals) is prevented by using appropriate techniques such as:
|
2.11.
Emissions to water and waste water management
BAT 47.
In order to prevent or, where that is not practicable, to reduce emissions to water and to reduce water consumption, BAT is to use all of the techniques given below.
Technique |
Description |
Applicability |
|||||||
(a) |
Techniques to prevent contamination of rain and surface run-off water |
Rain and surface run-off water are kept separated from areas where treatment chemicals are stored or handled, from areas where freshly treated wood is stored and from contaminated water. This is achieved by using at least the following techniques:
|
For existing plants, the applicability of drainage channels and an outer kerb bund may be restricted by the size of the plant area. |
||||||
(b) |
Collection of potentially contaminated surface run-off water |
Surface run-off water from areas that are potentially contaminated with treatment chemicals is collected separately. Collected waste water is discharged only after appropriate measures are taken e.g. monitor (see BAT 43), treat (see BAT 47 (e)), re-use (see BAT 47 (c). |
Generally applicable. |
||||||
(c) |
Use of potentially contaminated surface run-off water |
After its collection, potentially contaminated surface run-off water is used for the preparation of water-based wood preservative solutions. |
Only applicable to plants using water-based treatment chemicals. Applicability may be restricted by the quality requirements for its intended use. |
||||||
(d) |
Reuse of cleaning water |
Water used to wash equipment and containers is recovered and reused in the preparation of water-based wood preservative solutions. |
Only applicable to plants using water-based treatment chemicals. |
||||||
(e) |
Treatment of waste water |
Where contamination in the collected surface run-off water and/or cleaning water is detected or can be expected, and where the use of the water is not feasible, the waste water is treated in an adequate waste water treatment plant (on or off site). |
Generally applicable. |
||||||
(f) |
Disposal as hazardous waste |
Where contamination in the collected surface run-off water and/or cleaning water is detected or can be expected, and where the treatment or use of the water is not feasible, the collected surface run-off water and/or cleaning water is disposed of as hazardous waste. |
Generally applicable. |
BAT 48.
In order to reduce emissions to water from wood and wood products preservation using creosote, BAT is to collect the condensates from the depressurisation and vacuum operation of the treatment vessel and from creosote (re)conditioning and either treat them on site using an activated carbon or sand filter or dispose of them as hazardous waste.
Description:
2.12.
Emissions to air
BAT 49.
In order to reduce emissions of VOCs to air from wood and wood products preservation using solvent-based treatment chemicals, BAT is to enclose the emitting equipment or processes, extract the off-gases and send them to a treatment system (see techniques in BAT 51).
BAT 50.
In order to reduce emissions of organic compounds and odour to air from wood and wood products preservation using creosote, BAT is to use low-volatility impregnating oils, i.e. Grade C creosote instead of Grade B.
Applicability
BAT 51.
In order to reduce emissions of organic compounds to air from wood and wood products preservation using creosote, BAT is to enclose emitting equipment or processes (e.g. storage and impregnation tanks, depressurisation, creosote reconditioning), extract the off-gases and use one or a combination of the treatment techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Thermal oxidation |
See BAT 15 (i). Exhaust heat can be recovered by means of heat exchangers. |
Generally applicable. |
(b) |
Sending off-gases to a combustion plant |
Part or all of the off-gases are sent as combustion air and supplementary fuel to a combustion plant (including CHP (combined heat and power) plants) used for steam and/or electricity production. |
Not applicable for off-gases containing substances referred to in IED Article 59(5). Applicability may be restricted due to safety considerations. |
(c) |
Adsorption using activated carbon |
Organic compounds are adsorbed on the surface of activated carbon. Adsorbed compounds may be subsequently desorbed, e.g. with steam (often on site) for reuse or disposal and the adsorbent is reused. |
Generally applicable. |
(d) |
Absorption using a suitable liquid |
Use of a suitable liquid to remove pollutants from the off-gases by absorption, in particular soluble compounds. |
Generally applicable. |
(e) |
Condensation |
A technique for removing organic compounds by reducing the temperature below their dew points so that the vapours liquefy. Depending on the operating temperature range required, different refrigerants are used, e.g. cooling water, chilled water (temperature typically around 5 °C), ammonia or propane. Condensation is used in combination with another abatement technique. |
Applicability may be restricted where the energy demand for recovery is excessive due to the low VOC content. |
Parameter |
Unit |
Process |
BAT-AEL (Average over the sampling period) |
TVOC |
mg C/Nm3 |
Creosote and solvent-based treatment |
< 4–20 |
PAHs |
mg/Nm3 |
Creosote treatment |
< 1(65) |
BAT 52.
In order to reduce NO
X
emissions in waste gases while limiting CO emissions from the thermal treatment of off-gases in wood and wood products preservation using creosote and/or solvent-based treatment chemicals, BAT is to use technique (a) or both of the techniques given below.
Technique |
Description |
Applicability |
|
(a) |
Optimisation of thermal treatment conditions (design and operation) |
See BAT 17 (a). |
Design applicability may be restricted for existing plants. |
(b) |
Use of low-NOX burners |
See BAT 17 (b). |
Applicability may be restricted at existing plants by design and/or operational constraints. |
Parameter |
Unit |
BAT-AEL(66) (Average over the sampling period) |
Indicative emission level(66) (Average over the sampling period) |
NOX |
mg/Nm3 |
20–130 |
No indicative level |
CO |
No BAT-AEL |
20–150 |
2.13.
Noise
BAT 53.
In order to prevent or, where that is not practicable, to reduce noise emissions, BAT is to use one or a combination of the techniques given below.
Technique |
|
Storage and handling of raw materials |
|
(a) |
Installation of noise walls and utilisation/optimisation of the noise-absorbing effect of buildings |
(b) |
Enclosure or partial enclosure of noisy operations |
(c) |
Use of low-noise vehicles/transport systems |
(d) |
Noise management measures (e.g. improved inspection and maintenance of equipment, closing of doors and windows) |
Kiln drying |
|
(e) |
Noise reduction measures for fans |