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GCSE Chemistry · key term
The liquid that remains above the settled sludge after sedimentation.
Used by AQA
Specification 4.10.1.3 · Paper 2
Revise: Waste Water TreatmentThe liquid above the sludge is called effluent. Sedimentation therefore produces two different streams, and each receives a different biological treatment.
For a sequence question, give the stages in order: screening and grit removal → sedimentation → anaerobic digestion of sludge and aerobic biological treatment of effluent.
Do not swap the two biological treatments: sludge is digested anaerobically; effluent is treated aerobically.
State what sedimentation produces as well as what happens: solids sink to form sludge, leaving liquid effluent above.
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