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A septic tank treats domestic sewage by

  • A.aerating the liquid with mechanical blowers
  • B.filtering the liquid through a membrane
  • C.chlorinating the liquid before discharge
  • D.settling solids and digesting them anaerobically

Answer: D

Solids settle and are slowly digested without oxygen in the sealed tank, while the clarified liquid passes to a soakaway or drainage field where aerobic soil organisms complete the treatment. Accumulated sludge must be pumped out periodically.

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