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

Closes 9 Jan 2026

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BAT 35

In order to reduce the generation of waste water and to reduce water usage, BAT is to use all of the techniques given below.

i. Segregation of water streams

Compliance Status:

Leachate seeping from compost piles and windrows is segregated from surface run-off water (see BAT 19f).

In relation to Non waste AD this applies to feedstock storage, eg. silage clamps

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ii. water recirculation

Recirculating process water streams (e.g. from dewatering of liquid digestate in anaerobic processes) or using as much as possible other water streams (e.g. water condensate, rinsing water, surface run-off water). The degree of recirculation is limited by the water balance of the plant, the content of impurities (e.g. heavy metals, salts, pathogens, odorous compounds) and/or the characteristics of the water streams (e.g. nutrient content).

Compliance Status:

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iii. minimisation of the generation of leachate

Compliance Status:

Optimising the moisture content of the waste in order to minimise the generation of leachate.  

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