What happens to activated sludge?

  • A
    It is generally released into natural water bodies like rivers and streams
  • B
    It is completely pumped back into aeration tank to serve as inoculum
  • C
    The major part of the sludge is pumped into large tanks called anaerobic sludge digesters
  • D
    It undergoes sequential filtration

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Select the appropriate option regarding the anaerobic sludge digester.

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