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Question

The primary treatment of sewage:

A
Produces activated sludge
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B
Is anaerobic biological process
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C
Is a physical process
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D
Involves anaerobic sludge digester
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Solution

The correct option is C Is a physical process
  • Primary treatment (physical process) removes floating debris, grits and pebbles from sewage.
  • Secondary treatment of sewage is a biological process that includes aeration tank and anaerobic sludge digester.
  • During secondary treatment, activated sludge is produced and pumped back in aeration tank.

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