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

Closes 9 Jan 2026

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BAT 38

In order to reduce emissions to air and to improve the overall environmental performance, BAT is to monitor and/or control the key waste and process parameters.

 

i. Emissions to air

Compliance Status:

Implementation of a manual and/or automatic monitoring system to:

  • ensure a stable digester operation;
  •  minimise operational difficulties, such as foaming, which may lead to odour emissions;
  • provide sufficient early warning of system failures which may lead to a loss of containment and explosions. This includes monitoring and/or control of key waste and process parameters, e.g.: — pH and alkalinity of the digester feed;
  • digester operating temperature;
  • hydraulic and organic loading rates of the digester feed;
  • concentration of volatile fatty acids (VFA) and ammonia within the digester and digestate;
  • biogas quantity, composition (e.g. H2S) and pressure;
  • liquid and foam levels in the digester.

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