# Commission Implementing Decision of 9 October 2014 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions, for the refining of mineral oil and gas (notified under document C(2014) 7155) (Text with EEA relevance) (2014/738/EU), Division 1.21.2: Waste water treatment

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

Technique
Description
Removal of insoluble substances by recovering oil.
These techniques generally include:
API Separators (APIs)
Corrugated Plate Interceptors (CPIs)
Parallel Plate Interceptors (PPIs)
Tilted Plate Interceptors (TPIs)
Buffer and/or equalisation tanks
Removal of insoluble substances by recovering suspended solid and dispersed oil
These techniques generally include:
Dissolved Gas Flotation (DGF)
Induced Gas Flotation (IGF)
Sand Filtration
Removal of soluble substances including biological treatment and clarification
Biological treatment techniques may include:
Fixed bed systems
Suspended bed systems.
One of the most commonly used suspended bed system in refineries WWTP is the activated sludge process. Fixed bed systems may include a biofilter or trickling filter
Additional treatment step
A specific waste water treatment intended to complement the previous treatment steps e.g. for further reducing nitrogen or carbon compounds. Generally used where specific local requirements for water preservation exist.

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Source: https://www.legislation.gov.uk/eudn/2014/738/annex/division/4/division/1.21/division/1.21.2 (the official version)
Page: https://openlegislation.uk/eu-decision-2014-738/annex/division-4/division-1.21/division-1.21.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.