# 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 BAT 13: When further removal of organic substances or nitrogen is needed, BAT is to use an additional treatment step as described in Section 1.21.2.

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

Table 3
BAT-associated emission levels for direct waste water discharges from the refining of mineral oil and gas and monitoring frequencies associated with BAT
Not all parameters and sampling frequencies are applicable to effluent from gas refining sites.
Refers to a flow-proportional composite sample taken over a period of 24 hours or, provided that sufficient flow stability is demonstrated, a time-proportional sample.
Moving from the current method to EN 9377-2 may require an adaptation period.
Where on-site correlation is available, COD may be replaced by TOC. The correlation between COD and TOC should be elaborated on a case-by-case basis. TOC monitoring would be the preferred option because it does not rely on the use of very toxic compounds.
Where total-nitrogen is the sum of total Kjeldahl nitrogen (TKN), nitrates and nitrites.
When nitrification/denitrification is used, levels below 15 mg/l can be achieved.
Parameter
Unit
BAT-AEL(yearly average)
Monitoring frequency and analytical method (standard)
Hydrocarbon oil index (HOI)
mg/l
0,1-2,5
Daily
EN 9377- 2
Total suspended solids (TSS)
mg/l
5-25
Daily
Chemical oxygen demand (COD)
mg/l
30-125
Daily
BOD5
mg/l
No BAT-AEL
Weekly
Total nitrogen, expressed as N
mg/l
1-25
Daily
Lead, expressed as Pb
mg/l
0,005-0,030
Quarterly
Cadmium, expressed as Cd
mg/l
0,002-0,008
Quarterly
Nickel, expressed as Ni
mg/l
0,005-0,100
Quarterly
Mercury, expressed as Hg
mg/l
0,0001-0,001
Quarterly
Vanadium
mg/l
No BAT-AEL
Quarterly
Phenol Index
mg/l
No BAT-AEL
Monthly
EN 14402
Benzene, toluene, ethyl benzene, xylene (BTEX)
mg/l
Benzene: 0,001-0,050
No BAT-AEL for T, E, X
Monthly

---
Source: https://www.legislation.gov.uk/eudn/2014/738/annex/division/3/division/1.1/division/1.1.7/division/BATn3 (the official version)
Page: https://openlegislation.uk/eu-decision-2014-738/annex/division-3/division-1.1/division-1.1.7/division-BATn3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.