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A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as:
  • a)
    primary treatment
  • b)
    activated sludge treatment
  • c)
    tertiary treatment
  • d)
    none of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A sewage treatment process in which a part of decomposer bacteria pres...
The activated sludge system, a part of secondary treatment is one of the widely used aerobic treatment systems for  waste water in which very vigorous aeration of the sewage is done. The sewage is passed into an aeration tank from the primary settling tank.
The flocs are allowed to settle down in secondary settling tank, the bacterial flocks are allowed to undergo sedimentation. The effluent or supernatant is  generally passed into natural water bodies like rivers and streams. The sediment of the settling tank is called activated sludge. A part of it is used as inoculum in aeration tanks. The remaining part is passed into a large tank called anaerobic sludge digesters.
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A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as:a)primary treatmentb)activated sludge treatmentc)tertiary treatmentd)none of theseCorrect answer is option 'B'. Can you explain this answer?
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