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GCSE Chemistry · key term
The breakdown of organic matter by microorganisms without oxygen.
Used by AQA
Specification 4.10.1.3 · Paper 2
Revise: Waste Water TreatmentMicroorganisms break down its organic matter without oxygen, so the process is anaerobic digestion. This reduces the amount of organic material in the sludge.
For a sequence question, give the stages in order: screening and grit removal → sedimentation → anaerobic digestion of sludge and aerobic biological treatment of effluent.
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