Commission Implementing Decision (EU) 2016/1032 of 13 June 2016 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the non-ferrous metals industries (notified under document C(2016) 3563) (Text with EEA relevance) (c. 1032)

Please note that the date you requested in the address for this web page is not an actual date upon which a change occurred to this item of legislation. You are being shown the legislation from , which is the first date before then upon which a change was made.

ANNEX U.K. BAT CONCLUSIONS FOR THE NON-FERROUS METALS INDUSTRIES

1.3. BAT CONCLUSIONS FOR ALUMINIUM PRODUCTION INCLUDING ALUMINA AND ANODE PRODUCTION U.K.

1.3.1. Alumina production U.K.

1.3.1.1. Energy U.K.

BAT 55. In order to use energy efficiently during the production of alumina from bauxite, BAT is to use one or a combination of the techniques given below. U.K.

	Technique	Description	Applicability
a	Plate heat exchangers	Plate heat exchangers allow a higher heat recovery from the liquor flowing to the precipitation area in comparison with other techniques such as flash cooling plants	Applicable if the energy from the cooling fluid can be reused in the process and if the condensate balance and the liquor conditions allow it
b	Circulating fluidised bed calciners	Circulating fluidised bed calciners have a much higher energy efficiency than rotary kilns, since the heat recovery from the alumina and the flue-gas is greater	Only applicable to smelter-grade aluminas. Not applicable to speciality/non-smelter-grade aluminas, as these require a higher level of calcination that can currently only be achieved with a rotary kiln
c	Single stream digestion design	The slurry is heated up in one circuit without using live steam and therefore without dilution of the slurry (in contrast to the double-stream digestion design)	Only applicable to new plants
d	Selection of the bauxite	Bauxite with a higher moisture content carries more water into the process, which increases the energy need for evaporation. In addition, bauxites with a high monohydrate content (boehmite and/or diaspore) require a higher pressure and temperature in the digestion process, leading to higher energy consumption	Applicable within the constraints related to the specific design of the plant, since some plants are specifically designed for a certain quality of bauxite, which limits the use of alternative bauxite sources

1.3.1.2. Air emissions U.K.

BAT 56. In order to reduce dust and metal emissions from alumina calcination, BAT is to use a bag filter or an ESP. U.K.

1.3.1.3. Waste U.K.

BAT 57. In order to reduce the quantities of waste sent for disposal and to improve the disposal of bauxite residues from alumina production, BAT is to use one or both of the techniques given below. U.K.

	Technique
a	Reduce the volume of bauxite residues by compacting in order to minimise the moisture content, e.g. using vacuum or high-pressure filters to form a semi-dry cake
b	Reduce/minimise the alkalinity remaining in the bauxite residues in order to allow disposal of the residues in a landfill

1.3.2. Anode production U.K.

1.3.2.1. Air emissions U.K.

1.3.2.1.1. Dust, PAH and fluoride emissions from the paste plant U.K.

BAT 58. In order to reduce dust emissions to air from a paste plant (removing coke dust from operations such as coke storage and grinding), BAT is to use a bag filter. U.K.

BAT-associated emission levels: See Table 7.

BAT 59. In order to reduce dust and PAH emissions to air from a paste plant (hot pitch storage, paste mixing, cooling and forming), BAT is to use one or a combination of the techniques given below. U.K.

a Descriptions of the techniques are given in Section 1.10.
	Techniquea
a	Dry scrubber using coke as the adsorbent agent, with or without precooling, followed by a bag filter
b	Regenerative thermal oxidiser
c	Catalytic thermal oxidiser

BAT-associated emission levels: See Table 7.

Table 7

BAT-associated emission levels for dust and BaP (as an indicator of PAH) emissions to air from a paste plant

a As a daily average or as an average over the sampling period.
b As an average over the sampling period.
Parameter	Process	BAT-AEL (mg/Nm3)
Dust	Hot pitch storage, paste mixing, cooling and forming Removing coke dust from operations such as coke storage and grinding	2-5a
BaP	Hot pitch storage, paste mixing, cooling and forming	0,001-0,01b

The associated monitoring is in BAT 10.

1.3.2.1.2. Dust, sulphur dioxide, PAH and fluoride emissions from the baking plant U.K.

BAT 60. In order to reduce dust, sulphur dioxide, PAH and fluoride emissions to air from a baking plant in an anode production plant integrated with a primary aluminium smelter, BAT is to use one or a combination of the techniques given below. U.K.

a Descriptions of the techniques are given in Section 1.10.
	Techniquea	Applicability
a	Use of raw materials and fuels containing a low amount of sulphur	Generally applicable for reducing SO2 emissions
b	Dry scrubber using alumina as the adsorbent agent followed by a bag filter	Generally applicable for reducing dust, PAH and fluoride emissions
c	Wet scrubber	Applicability for reducing dust, SO2, PAH and fluoride emissions may be limited in the following cases: very high off-gas flow rates (due to the significant amounts of waste and waste water generated) in arid areas (due to the large volume of water necessary and the need for waste water treatment)
d	Regenerative thermal oxidiser in combination with a dust abatement system	Generally applicable for reducing dust and PAH emissions.

BAT-associated emission levels: See Table 8.

Table 8

BAT-associated emission levels for dust, BaP (as an indicator of PAH) and fluoride emissions to air from a baking plant in an anode production plant integrated with a primary aluminium smelter

a As a daily average or as an average over the sampling period.
b As an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)
Dust	2-5a
BaP	0,001-0,01b
HF	0,3-0,5a
Total fluorides	≤ 0,8b

The associated monitoring is in BAT 10.

BAT 61. In order to reduce dust, PAH and fluoride emissions to air from a baking plant in a stand-alone anode production plant, BAT is to use a pre-filtration unit and a regenerative thermal oxidiser followed by a dry scrubber (e.g. lime bed). U.K.

BAT-associated emission levels: See Table 9.

Table 9

BAT-associated emission levels for dust, BaP (as an indicator of PAH) and fluoride emissions to air from a baking plant in a stand-alone anode production plant

a As a daily average.
b As an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)
Dust	2-5a
BaP	0,001-0,01b
HF	≤ 3a

The associated monitoring is in BAT 10.

1.3.2.2. Waste water generation U.K.

BAT 62. In order to prevent the generation of waste water from anode baking, BAT is to use a closed water cycle. U.K.

Applicability U.K.

Generally applicable to new plants and major upgrades. The applicability may be limited due to water quality and/or product quality requirements.

1.3.2.3. Waste U.K.

BAT 63. In order to reduce the quantities of waste sent for disposal, BAT is to recycle carbon dust from the coke filter as a scrubbing medium. U.K.

Applicability U.K.

There may be restrictions on applicability depending on the ash content of the carbon dust.

1.3.3. Primary aluminium production U.K.

1.3.3.1. Air emissions U.K.

BAT 64. In order to prevent or collect diffuse emissions from electrolytic cells in primary aluminium production using the Søderberg technology, BAT is to use a combination of the techniques given below. U.K.

	Technique
a	Use of paste with a pitch content between 25 % and 28 % (dry paste)
b	Upgrade the manifold design to allow closed point feeding operations and improved off-gas collection efficiency
c	Alumina point feeding
d	Increased anode height combined with the treatment in BAT 67
e	Anode top hooding when high current density anodes are used, connected to the treatment in BAT 67

Description U.K.

BAT 64(c): Point feeding of alumina avoids the regular crust-breaking (such as during manual side feed or bar broken feed), and thus reduces the associated fluoride and dust emissions.

BAT 64(d): An increased anode height helps to achieve lower temperatures in the anode top, resulting in lower emissions to air.

BAT-associated emission levels: See Table 12.

BAT 65. In order to prevent or collect diffuse emissions from electrolytic cells in primary aluminium production using prebaked anodes, BAT is to use a combination of the techniques given below. U.K.

	Technique
a	Automatic multiple point feeding of alumina
b	Complete hood coverage of the cell and adequate off-gas extraction rates (to lead the off-gas to the treatment in BAT 67) taking into account fluoride generation from bath and carbon anode consumption
c	Boosted suction system connected to the abatement techniques listed in BAT 67
d	Minimisation of the time for changing anodes and other activities that require cell hoods to be removed
e	Efficient process control system avoiding process deviations that might otherwise lead to increased cell evolution and emissions
f	Use of a programmed system for cell operations and maintenance
g	Use of established efficient cleaning methods in the rodding plant to recover fluorides and carbon
h	Storage of removed anodes in a compartment near the cell, connected to the treatment in BAT 67, or storage of the butts in confined boxes

Applicability U.K.

BAT 65.c and h are not applicable to existing plants

BAT-associated emission levels: See Table 12.

1.3.3.1.1. Channelled dust and fluoride emissions U.K.

BAT 66. In order to reduce dust emissions from the storage, handling and transport of raw materials, BAT is to use a bag filter. U.K.

BAT-associated emission levels: See Table 10.

Table 10

BAT-associated emission levels for dust from the storage, handling and transport of raw materials

a As an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)a
Dust	≤ 5-10

The associated monitoring is in BAT 10.

BAT 67. In order to reduce dust, metal and fluoride emissions to air from electrolytic cells, BAT is to use one of the techniques given below. U.K.

a Descriptions of the techniques are given in Section 1.10
	Techniquea	Applicability
a	Dry scrubber using alumina as the adsorbent agent followed by a bag filter	Generally applicable
b	Dry scrubber using alumina as the adsorbent agent followed by a bag filter and a wet scrubber	Applicability may be limited in the following cases: very high off-gas flow rates (due to the significant amounts of waste and waste water generated) in arid areas (due to the large volume of water necessary and the need for waste water treatment)

BAT-associated emission levels: See Table 11 and Table 12.

Table 11

BAT-associated emission levels for dust and fluoride emissions to air from electrolytic cells

a As a daily average or as an average over the sampling period.
b As an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)
Dust	2-5a
HF	≤ 1,0a
Total fluorides	≤ 1,5b

The associated monitoring is in BAT 10.

1.3.3.1.2. Total emissions of dust and fluorides U.K.

BAT-associated emission levels for the total emissions of dust and fluoride to air from the electrolysis house (collected from the electrolytic cells and roof vents): See Table 12.

Table 12

BAT-associated emission levels for the total emissions of dust and fluoride to air from the electrolysis house (collected from the electrolytic cells and roof vents)

a As mass of pollutant emitted during a year from the electrolysis house divided by the mass of liquid aluminium produced in the same year.
b These BAT-AELs are not applicable to plants that due to their configuration cannot measure roof emissions.
Parameter	BAT	BAT-AELs for existing plants (kg/t Al)a b	BAT-AELs for new plants (kg/t Al)a
Dust	Combination of BAT 64, BAT 65 and BAT 67	≤ 1,2	≤ 0,6
Total fluorides		≤ 0,6	≤ 0,35

The associated monitoring is in BAT 10.

BAT 68. In order to prevent or reduce dust and metal emissions to air from melting and molten metal treatment and casting in primary aluminium production, BAT is to use one or both of the techniques given below. U.K.

a Description of the technique is given in Section 1.10.
	Technique
a	Use of liquid metal from electrolysis and uncontaminated aluminium material, i.e. solid material free of substances such as paint, plastic or oil (e.g. the top and the bottom part of the billets that are cut for quality reasons)
b	Bag filtera

BAT-associated emission levels: See Table 13.

Table 13

BAT-associated emission levels for dust emissions to air from melting and molten metal treatment and casting in primary aluminium production

a As an average of the samples obtained over a year.
b The lower end of the range is associated with the use of a bag filter.
Parameter	BAT-AEL (mg/Nm3)a b
Dust	2-25

The associated monitoring is in BAT 10.

1.3.3.1.3. Sulphur dioxide emissions U.K.

BAT 69. In order to reduce emissions to air from electrolytic cells, BAT is to use one or both of the techniques given below. U.K.

a Description of the technique is given in Section 1.10.
	Technique	Applicability
a	Use of low-sulphur anodes	Generally applicable
b	Wet scrubbera	Applicability may be limited in the following cases: very high off-gas flow rates (due to the significant amounts of waste and waste water generated) in arid areas (due to the large volume of water necessary and the need for waste water treatment)

Description U.K.

BAT 69(a): Anodes containing less than 1,5 % sulphur as a yearly average can be produced by an appropriate combination of the raw materials used. A minimum sulphur content of 0,9 % as a yearly average is required for the viability of the electrolysis process.

BAT-associated emission levels: See Table 14.

Table 14

BAT-associated emission levels for SO₂ emissions to air from electrolytic cells

a As mass of pollutant emitted during a year divided by the mass of liquid aluminium produced in the same year.
b The lower end of the range is associated with the use of a wet scrubber. The higher end of the range is associated with the use of low-sulphur anodes.
Parameter	BAT-AEL (kg/t Al)a b
SO2	≤ 2,5-15

The associated monitoring is in BAT 10.

1.3.3.1.4. Perfluorocarbon emissions U.K.

BAT 70. In order to reduce perfluorocarbon emissions to air from primary aluminium production, BAT is to use all of the techniques given below. U.K.

	Technique	Applicability
a	Automatic multiple point feeding of alumina	Generally applicable
b	Computer control of the electrolysis process based on active cell databases and monitoring of cell operating parameters	Generally applicable
c	Automatic anode effect suppression	Not applicable to Søderberg cells because the anode design (one piece only) does not allow the bath flow associated with this technique

Description U.K.

BAT 70(c): The anode effect takes place when the alumina content of the electrolyte falls below 1-2 %. During anode effects, instead of decomposing alumina, the cryolite bath is decomposed into metal and fluoride ions, the latter forming gaseous perfluorocarbons, which react with the carbon anode.

1.3.3.1.5. PAH and CO emissions U.K.

BAT 71. In order to reduce CO and PAH emissions to air from primary aluminium production using the Søderberg technology, BAT is to combust the CO and the PAH in the cell exhaust gas. U.K.

1.3.3.2. Waste water generation U.K.

BAT 72. In order to prevent the generation of waste water, BAT is to reuse or recycle cooling water and treated waste water, including rainwater, within the process. U.K.

Applicability U.K.

Generally applicable to new plants and major upgrades. The applicability may be limited due to water quality and/or product quality requirements. The amount of cooling water, treated waste water and rainwater that is reused or recycled cannot be higher than the amount of water needed for the process.

1.3.3.3. Waste U.K.

BAT 73. In order to reduce the disposal of spent pot lining, BAT is to organise operations on site so as to facilitate its external recycling, such as in cement manufacturing in the salt slag recovery process, as a carburiser in the steel or ferro-alloy industry or as a secondary raw material (e.g. rock wool), depending on the end consumer’s requirements. U.K.

1.3.4. Secondary aluminium production U.K.

1.3.4.1. Secondary materials U.K.

BAT 74. In order to increase the raw materials’ yield, BAT is to separate non-metallic constituents and metals other than aluminium by using one or a combination of the techniques given below depending on the constituents of the treated materials. U.K.

	Technique
a	Magnetic separation of ferrous metals
b	Eddy current separation (using moving electromagnetic fields) of aluminium from the other constituents
c	Relative density separation (using a fluid with a different density) of different metals and non-metallic constituents

1.3.4.2. Energy U.K.

BAT 75. In order to use energy efficiently, BAT is to use one or a combination of the techniques given below. U.K.

	Technique	Applicability
a	Preheating of the furnace charge with the exhaust gas	Only applicable for non-rotating furnaces
b	Recirculation of the gases with unburnt hydrocarbons back into the burner system	Only applicable for reverberatory furnaces and dryers
c	Supply the liquid metal for direct moulding	Applicability is limited by the time needed for the transportation (maximum 4-5 hours)

1.3.4.3. Air emissions U.K.

BAT 76. In order to prevent or reduce emissions to air, BAT is to remove oil and organic compounds from the swarf before the smelting stage using centrifugation and/or drying(1). U.K.

Applicability U.K.

Centrifugation is only applicable to highly oil-contaminated swarf, when it is applied before the drying. The removal of oil and organic compounds may not be needed if the furnace and the abatement system are designed to handle the organic material.

1.3.4.3.1. Diffuse emissions U.K.

BAT 77. In order to prevent or reduce diffuse emissions from the pretreatment of scraps, BAT is to use one or both of the techniques given below. U.K.

	Technique
a	Closed or pneumatic conveyor, with an air extraction system
b	Enclosures or hoods for the charging and for the discharge points, with an air extraction system

BAT 78. In order to prevent or reduce diffuse emissions from the charging and discharging/tapping of melting furnaces, BAT is to use one or a combination of the techniques given below. U.K.

a Description of the technique is given in Section 1.10.
	Technique	Applicability
a	Placing a hood on top of the furnace door and at the taphole with off-gas extraction connected to a filtration system	Generally applicable
b	Fume collection enclosure that covers both the charging and tapping zones	Only applicable for stationary drum furnaces
c	Sealed furnace doora	Generally applicable
d	Sealed charging carriage	Only applicable for non-rotating furnaces
e	Boosted suction system that can be modified according to the process neededa	Generally applicable

Description U.K.

BAT 78(a) and (b): Consist of applying a covering with extraction to collect and handle the off-gases from the process.

BAT 78(d): The skip seals against the open furnace door during the discharge of scrap and maintains furnace sealing during this stage.

BAT 79. In order to reduce emissions from skimmings/dross treatment, BAT is to use one or a combination of the techniques given below. U.K.

	Technique
a	Cooling of skimmings/dross, as soon as they are skimmed from the furnace, in sealed containers under inert gas
b	Prevention of wetting of the skimmings/dross
c	Compaction of skimmings/dross with an air extraction and dust abatement system

1.3.4.3.2. Channelled dust emissions U.K.

BAT 80. In order to reduce dust and metal emissions from the swarf drying and the removal of oil and organic compounds from the swarf, from the crushing, milling and dry separation of non-metallic constituents and metals other than aluminium, and from the storage, handling and transport in secondary aluminium production, BAT is to use a bag filter. U.K.

BAT-associated emission levels: See Table 15.

Table 15

BAT-associated emission levels for dust emissions to air from the swarf drying and the removal of oil and organic compounds from the swarf, from the crushing, milling and dry separation of non-metallic constituents and metals other than aluminium, and from the storage, handling and transport in secondary aluminium production

a As an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)a
Dust	≤ 5

The associated monitoring is in BAT 10.

BAT 81. In order to reduce dust and metal emissions to air from furnace processes such as charging, melting, tapping and molten metal treatment in secondary aluminium production, BAT is to use a bag filter. U.K.

BAT-associated emission levels: See Table 16.

Table 16

BAT-associated emission levels for dust emissions to air from furnace processes such as charging, melting, tapping and molten metal treatment in secondary aluminium production

a As a daily average or as an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)a
Dust	2-5

The associated monitoring is in BAT 10.

BAT 82. In order to reduce dust and metal emissions to air from remelting in secondary aluminium production, BAT is to use one or a combination of the techniques given below. U.K.

	Technique
a	Use of uncontaminated aluminium material i.e. solid material free of substances such as paint, plastic or oil (e.g. billets)
b	Optimise combustion conditions to reduce the emissions of dust
c	Bag filter

BAT-associated emission levels: See Table 17.

Table 17

BAT-associated emission levels for dust from remelting in secondary aluminium production

a As an average over the sampling period.
b For furnaces designed to use and using only uncontaminated raw material, for which dust emissions are below 1 kg/h, the upper end of the range is 25 mg/Nm3 as an average of the samples obtained over a year.
Parameter	BAT-AEL (mg/Nm3)a b
Dust	2-5

The associated monitoring is in BAT 10.

1.3.4.3.3. Organic compound emissions U.K.

BAT 83. In order to reduce emissions to air of organic compounds and PCDD/F from the thermal treatment of contaminated secondary raw materials (e.g. swarf) and from the melting furnace, BAT is to use a bag filter in combination with at least one of the techniques given below. U.K.

a Descriptions of the techniques are given in Section 1.10.
	Techniquea
a	Select and feed the raw materials according to the furnace and the abatement techniques used
b	Internal burner system for melting furnaces
c	Afterburner
d	Rapid quenching
e	Activated carbon injection

BAT-associated emission levels: See Table 18.

Table 18

BAT-associated emission levels for emissions to air of TVOC and PCDD/F from the thermal treatment of contaminated secondary raw materials (e.g. swarf) and from the melting furnace

a As a daily average or as an average over the sampling period.
b As an average over a sampling period of at least six hours.
Parameter	Unit	BAT-AEL
TVOC	mg/Nm3	≤ 10-30a
PCDD/F	ng I-TEQ/Nm3	≤ 0,1b

The associated monitoring is in BAT 10.

1.3.4.3.4. Acid emissions U.K.

BAT 84. In order to reduce emissions to air of HCl, Cl₂ and HF from the thermal treatment of contaminated secondary raw materials (e.g. swarf), the melting furnace, and remelting and molten metal treatment, BAT is to use one or a combination of the techniques given below. U.K.

a Description of the techniques are given in Section 1.10.
Technique
a	Select and feed the raw materials according to the furnace and the abatement techniques useda
b	Ca(OH)2 or sodium bicarbonate injection in combination with a bag filtera
c	Control of the refining process, adapting the quantity of refining gas used to remove the contaminants present into the molten metals
d	Use of dilute chlorine with inert gas in the refining process

Description U.K.

BAT 84(d): Using chlorine diluted with inert gas instead of only pure chlorine, to reduce the emission of chlorine. Refining can also be performed using only the inert gas.

BAT-associated emission levels: See Table 19.

Table 19

BAT-associated emission levels for HCl, Cl₂ and HF emissions to air from the thermal treatment of contaminated secondary raw materials (e.g. swarf), the melting furnace, and remelting and molten metal treatment

a As a daily average or as an average over the sampling period. For refining carried out with chemicals containing chlorine, the BAT-AEL refers to the average concentration during chlorination.
b As an average over the sampling period. For refining carried out with chemicals containing chlorine, the BAT-AEL refers to the average concentration during chlorination.
c Only applicable to emissions from refining processes carried out with chemicals containing chlorine.
d As an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)
HCl	≤ 5-10a
Cl2	≤ 1b c
HF	≤ 1d

The associated monitoring is in BAT 10.

1.3.4.4. Waste U.K.

BAT 85. In order to reduce the quantities of waste sent for disposal from secondary aluminium production, BAT is to organise operations on site so as to facilitate process residues reuse or, failing that, process residues recycling, including by using one or a combination of the techniques given below. U.K.

	Technique
a	Reuse collected dust in the process in the case of a melting furnace using salt cover or in the salt slag recovery process
b	Full recycling of the salt slag
c	Apply skimmings/dross treatment to recover aluminium in the case of furnaces that do not use salt cover

BAT 86. In order to reduce the quantities of salt slag produced from secondary aluminium production, BAT is to use one or a combination of the techniques given below. U.K.

	Technique	Applicability
a	Increase the quality of raw material used through the separation of the non-metallic constituents and metals other than aluminium for scraps where aluminium is mixed with other constituents	Generally applicable
b	Remove oil and organic constituents from contaminated swarf before melting	Generally applicable
c	Metal pumping or stirring	Not applicable for rotary furnaces
d	Tilting rotary furnace	There may be restrictions on the use of this furnace due to the size of the feed materials

1.3.5. Salt slag recycling process U.K.

1.3.5.1. Diffuse emissions U.K.

BAT 87. In order to prevent or reduce diffuse emissions from the salt slag recycling process, BAT is to use one or both of the techniques given below. U.K.

	Technique
a	Enclose equipment with gas extraction connected to a filtration system
b	Hood with gas extraction connected to a filtration system

1.3.5.2. Channelled dust emissions U.K.

BAT 88. In order to reduce dust and metal emissions to air from crushing and dry milling associated with the salt slag recovery process, BAT is to use a bag filter. U.K.

BAT-associated emission levels: See Table 20.

Table 20

BAT-associated emission levels for dust emissions to air from crushing and dry milling associated with the salt slag recovery process

a As a daily average or as an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)a
Dust	2-5

The associated monitoring is in BAT 10.

1.3.5.3. Gaseous compounds U.K.

BAT 89. In order to reduce gaseous emissions to air from wet milling and leaching from the salt slag recovery process, BAT is to use one or a combination of the techniques given below. U.K.

a Descriptions of the techniques are given in Section 1.10.
	Techniquea
a	Activated carbon injection
b	Afterburner
c	Wet scrubber with H2SO4 solution

BAT-associated emission levels: See Table 21.

Table 21

BAT-associated emission levels for gaseous emissions to air from wet milling and leaching from the salt slag recovery process

a As an average over the sampling period.
Parameter	BAT-AEL (mg/Nm3)a
NH3	≤ 10
PH3	≤ 0,5
H2S	≤ 2

The associated monitoring is in BAT 10.

(1)

Description of the techniques are given in Section 1.10.