# Commission Implementing Decision (EU) 2017/2117 of 21 November 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the production of large volume organic chemicals (notified under document C(2017) 7469) (Text with EEA relevance), Division BAT 46:: In order to prevent or reduce waste water generation (e.g. from cleaning, spills and condensates) and the organic load discharged to further waste water treatment, BAT is to use one or both of the techniques given below.

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

Technique
Description
Applicability
a.
Reuse of water
Aqueous streams (e.g. from cleaning, spills and condensates) are recirculated into the process mainly to adjust the formaldehyde product concentration. The extent to which water can be reused depends on the desired formaldehyde concentration
Generally applicable
b.
Chemical pretreatment
Conversion of formaldehyde into other substances which are less toxic, e.g. by addition of sodium sulphite or by oxidation
Only applicable to effluents which, due to their formaldehyde content, could have a negative effect on the downstream biological waste water treatment

---
Source: https://www.legislation.gov.uk/eudn/2017/2117/annex/division/5/division/5.2/division/BAT+46 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-2117/annex/division-5/division-5.2/division-BAT+46
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.