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

Closes 9 Jan 2026

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BAT 19

In order to optimise water consumption, to reduce the volume of waste water generated and to prevent or, where that is not practicable, to reduce emissions to soil and water, BAT is to use an appropriate combination of the techniques given below.

Please indicate which techniques are applied and why others are not appropriate.

 

i. water management

Water consumption is optimised by using measures which may include:

  • water-saving plans (e.g. establishment of water efficiency objectives, flow diagrams and water mass balances);
  • optimising the use of washing water (e.g. dry cleaning instead of hosing down, using trigger control on all washing equipment);
  • reducing the use of water for vacuum generation (e.g. use of liquid ring pumps with high boiling point liquids)

Compliance Status:

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ii. water recirculation

Water streams are recirculated within the plant, if necessary after treatment. The degree of recirculation is limited by the water balance of the plant, the content of impurities (e.g. odorous compounds) and/or the characteristics of the water streams (e.g. nutrient content)

Compliance Status:

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iii. impermeable surface: Depending on the risks posed by the waste in terms of soil and/or water contamination, the surface of the whole waste treatment area (e.g. waste reception, handling, storage, treatment and dispatch areas) is made impermeable to the liquids concerned.

Compliance Status:

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iv.techniques to reduce likelihood of overflows/failures from tanks/vessels: depending on the risks posed by the liquids contained in tanks and vessels in terms of soil and/or water contamination, this includes techniques such as:
  • overflow detectors;
  • overflow pipes that are directed to a contained drainage system (i.e. the relevant secondary containment or another vessel);
  •  tanks for liquids that are located in a suitable secondary containment; the volume is normally sized to accommodate the loss of containment of the largest tank within the secondary containment;
  •  isolation of tanks, vessels and secondary containment (e.g. closing of valves).
 

Compliance Status:

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v. roofing of waste storage/treatment areas: depending on the risks posed by the waste in terms of soil and/or water contamination, waste is stored and treated in covered areas to prevent contact with rainwater and thus minimise the volume of contaminated run-off water.
Please provide information relating to feedstock storage/treatment areas. 

 

Compliance Status:

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vi. segregation of water streams: each water stream (e.g. surface run-off water, process water) is collected and treated separately, based on the pollutant content and on the combination of treatment techniques. In particular, uncontaminated waste water streams are segregated from waste water streams that require treatment.

Generally applicable to new plants. Generally applicable to existing plants within the constraints associated with the layout of the water collection system.

Compliance Status:

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vii. adequate drainage infrastructure: the waste treatment area is connected to drainage infrastructure. Rainwater falling on the treatment and storage areas is collected in the drainage infrastructure along with washing water, occasional spillages, etc. and, depending on the pollutant content, recirculated or sent for further treatment.

Please provide information relating to the drainage of the feedstock storage and treatment area.

Compliance Status:

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viii. design and maintenance provisions to allow detection/repair of leaks: regular monitoring for potential leakages is risk-based, and, when necessary, equipment is repaired. The use of underground components is minimised. When underground components are used, and depending on the risks posed by the waste contained in those components in terms of soil and/or water contamination, secondary containment of underground components is put in place.

The use of above-ground components is generally applicable to new plants. It may be limited however by the risk of freezing. The installation of secondary containment may be limited in the case of existing plants.

Compliance Status:

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ix.appropriate buffer storage capacity. Generally applicable to new plants. For existing plants, applicability may be limited by space availability and by the layout of the water collection system.

Compliance Status:

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x. an inventory of waste water and waste gas streams (see BAT 3);

Compliance Status:

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xi. residues management plan (see description in Section 6.6.5);

Compliance Status:

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xii. accident management plan (see description in Section 6.6.5);[see also BAT 21]

Compliance Status:

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xiii. odour management plan (see BAT 12);

Compliance Status:

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xiv. noise and vibration management plan (see BAT 17).;

Compliance Status:

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