# 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 27:: In order to reduce the waste water volume and the organic load discharged to waste water treatment, BAT is to use an appropriate combination of the techniques given below.

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

Technique
Description
Applicability
a.
Water-free vacuum generation
Use mechanical pumping systems in a closed circuit procedure, discharging only a small amount of water as blowdown, or use dry-running pumps. In some cases, waste-water-free vacuum generation can be achieved by use of the product as a barrier liquid in a mechanical vacuum pump, or by use of a gas stream from the production process
Generally applicable
b.
Source segregation of aqueous effluents
Aqueous effluents from aromatics plants are segregated from waste water from other sources in order to facilitate the recovery of raw materials or products
For existing plants, the applicability may be restricted by site-specific drainage systems
c.
Liquid phase separation with recovery of hydrocarbons
Separation of organic and aqueous phases with appropriate design and operation (e.g. sufficient residence time, phase boundary detection and control) to prevent any entrainment of undissolved organic material
Generally applicable
d
Stripping with recovery of hydrocarbons
See Section 12.2. Stripping can be used on individual or combined streams
Applicability may be restricted when the concentration of hydrocarbons is low
e.
Reuse of water
With further treatment of some waste water streams, water from stripping can be used as process water or as boiler feed water, replacing other sources of water
Generally applicable

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Source: https://www.legislation.gov.uk/eudn/2017/2117/annex/division/3/division/3.2/division/BAT+27 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-2117/annex/division-3/division-3.2/division-BAT+27
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.