# Commission Implementing Decision of 11 February 2013 establishing the best available techniques (BAT) conclusions under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions for the tanning of hides and skins (notified under document C(2013) 618) (Text with EEA relevance) (2013/84/EU), Division: Description

Extent: E+W+S+N.I.

The application of an appropriate combination of the techniques described below. The combination of techniques can be implemented on site and/or off site, in two or three stages.
Technique
Description
Applicability
a
Mechanical treatment
Screening of gross solids, skimming of fats, oils, and greases and removal of solids by sedimentation.
Generally applicable for on-site and/or off-site treatment.
b
Physico-chemical treatment
Sulphide oxidation and/or precipitation, COD and suspended solids removal by, e.g., coagulation and flocculation. Chromium precipitation by increasing pH to 8 or above using an alkali (e.g. calcium hydroxide, magnesium oxide, sodium carbonate, sodium hydroxide, sodium aluminate).
Generally applicable for on-site and/or off-site treatment.
c
Biological treatment
Aerobic biological waste water treatment using aeration, including the removal of suspended solids by, e.g., sedimentation, secondary flotation.
Generally applicable for on-site and/or off-site treatment.
d
Biological nitrogen elimination
Nitrification of ammoniacal nitrogen compounds to nitrates, followed by the reduction of nitrates to gaseous nitrogen.
Applicable to plants with direct discharge to receiving water.
Difficult implementation into existing plants where there are space limitations.

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Source: https://www.legislation.gov.uk/eudn/2013/84/annex/division/2/division/1.5/division/10/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2013-84/annex/division-2/division-1.5/division-10/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.