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Discussion

Aeration in the activated sludge process is provided in order to

  • A.sterilize the wastewater before settling
  • B.supply oxygen to the microorganisms degrading the waste
  • C.raise the temperature of the mixed liquor
  • D.float the grit to the surface for removal

Answer: B

The organisms oxidising the organic matter are aerobic, so air or pure oxygen must be blown or stirred in continuously. Aeration also keeps the sludge in suspension so that it stays in contact with the waste it is consuming.

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