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Sludge is the term for

  • A.the foam that forms on an aeration tank
  • B.the settled solids separated during treatment
  • C.the clarified liquid leaving the final tank
  • D.the gas collected from the digester roof

Answer: B

Correct answer: the settled solids separated during treatment

Sludge is what settles out, at whatever stage: primary sludge from the settlement tanks and secondary or surplus activated sludge from the biological process. Its treatment and disposal commonly account for half the cost of running a works, which is out of all proportion to its volume.

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