# Commission Implementing Decision (EU) 2018/1147 of 10 August 2018 establishing best available techniques (BAT) conclusions for waste treatment, under Directive 2010/75/EU of the European Parliament and of the Council (notified under document C(2018) 5070) (Text with EEA relevance), Division 3.4.1: Emissions to air

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

BAT 39. In order to reduce emissions to air, BAT is to use both of the techniques given below.
Technique
Description
Applicability
a.
Segregation of the waste gas streams
Splitting of the total waste gas stream into waste gas streams with a high pollutant content and waste gas streams with a low pollutant content, as identified in the inventory mentioned in BAT 3.
Generally applicable to new plants.
Generally applicable to existing plants within the constraints associated with the layout of the air circuits.
b.
Recirculation of waste gas
Recirculation of waste gas with a low pollutant content in the biological process followed by waste gas treatment adapted to the concentration of pollutants (see BAT 34).
The use of waste gas in the biological process may be limited by the waste gas temperature and/or the pollutant content.
It may be necessary to condense the water vapour contained in the waste gas before reuse. In this case, cooling is necessary, and the condensed water is recirculated when possible (see BAT 35) or treated before discharge.

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Source: https://www.legislation.gov.uk/eudn/2018/1147/annex/division/3/division/3.4/division/3.4.1 (the official version)
Page: https://openlegislation.uk/eu-decision-2018-1147/annex/division-3/division-3.4/division-3.4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.