# 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 6

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

In order to reduce the pollutant load in the waste water before effluent treatment arising from the tanyard process steps, BAT is to use an appropriate combination of the techniques given below.
Technique
Description
Applicability
a
The use of short floats
Short floats are reduced amounts of process water. When less water is present, the quantity of process chemicals which is discarded unreacted is reduced.
This technique cannot be applied for the processing of calfskins.
Applicability is also limited to:
new processing vessels,
existing processing vessels that allow the use of, or can be modified to use, short floats.
b
Maximising the uptake of chromium tanning agents
Optimisation of the operating parameters (e.g. pH, float, temperature, time, and drum speed) and the use of chemicals to increase the proportion of the chromium-tanning agent taken up by the hides or skins.
Generally applicable.
c
Optimised vegetable-tanning methods
Use of drum tanning for part of the process.
Use of pretanning agents to aid penetration of vegetable tannins.
Cannot be applied in the production of vegetable-tanned sole leather.

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Source: https://www.legislation.gov.uk/eudn/2013/84/annex/division/2/division/1.4/division/1.4.2/division/6 (the official version)
Page: https://openlegislation.uk/eu-decision-2013-84/annex/division-2/division-1.4/division-1.4.2/division-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.