Call for Evidence : ​Non Waste Anaerobic Digestion over 100 tonnes per day: Permit technical requirements ​

Closes 9 Jan 2026

BAT 7

BAT is to monitor emissions to water with at least the frequency given below, and in accordance with EN standards. If EN standards are not available, BAT is to use ISO, national or other international standards that ensure the provision of data of an equivalent scientific quality. 

For each parameter below, confirm the measurements in place for your particular activity, the equipment used and where these measurements are undertaken. 

References

(1) Monitoring frequencies may be reduced if the emission levels are proven to be sufficiently stable. 
(2) In the case of batch discharge less frequent than the minimum monitoring frequency, monitoring is carried out once per batch.
(3) The monitoring only applies when the substance concerned is identified as relevant in the waste water inventory mentioned in BAT 3.
(4) In the case of an indirect discharge to a receiving water body, the monitoring frequency may be reduced if the downstream waste water treatment
plant abates the pollutants concerned. 
(5) Either TOC or COD is monitored. TOC is the preferred option, because its monitoring does not rely on the use of very toxic compounds. 
(6) The monitoring applies only in the case of a direct discharge to a receiving water body.

 

Substance/ Parameter: Chemical oxygen demand (COD) (5) (6)
Standard(s): No EN standard available
Waste treatment process:  All waste treatments except treatment of water-based liquid waste
Minimum monitoring frequency (1) (2): Once every month

Compliance Status:

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Substance/ Parameter: PFOA (3)

 

Standard(s): No EN standard available:
Waste treatment process: All waste treatments
Minimum monitoring frequency (1) (2): Once every six months

 

Compliance Status:

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Substance/ Parameter: PFOS (3)
 
Standard(s): No EN standard available
Waste treatment process: All waste treatments:
Minimum monitoring frequency (1) (2): Once every six months

 

Compliance Status:

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Substance/ Parameter: Total nitrogen (Total N) (6)
 
Standard(s): EN 12260,
EN ISO 11905-1
Waste treatment process: Biological treatment of waste
Minimum monitoring frequency (1) (2): Once every month
 

Compliance Status:

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Substance/ Parameter: Total phosphorus (Total P) (6)
 
Standard(s): Various EN standards
available (i.e. EN
ISO 15681-1 and -2,
EN ISO 6878,
EN ISO 11885) 
Waste treatment process: Biological treatment of waste
Minimum monitoring frequency (1) (2): Once every month

 

Compliance Status:

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Substance/ Parameter: Total suspended solids (TSS) (6)
 
Standard(s): EN 872 
Waste treatment process: All waste treatments except treatment of water-based liquid waste
Minimum monitoring frequency (1) (2): Once every month

 

Compliance Status:

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