Seeding of anaerobic digestion plants
If you comply with the requirements in this regulatory position statement (RPS) you won't need an environmental permit to use digestate, slurries and sewage sludge as a source of bacteria to activate the anaerobic digestion process.
Applies to England
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There is currently no provision in the standard rules permits, or the waste exemptions, to allow the use of waste water treatment sludges or other biologically active sludges to seed anaerobic digestion (AD) plants. This guidance sets out the requirements you need to follow to carry out this activity without an environmental permit.