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1 mark

Activated sludge plants are used to reduce:

  1. A
    water pollution.
  2. B
    noise pollution.
  3. C
    thermal pollution.
  4. D
    air pollution.

Solution & Step-by-step Explanation

Activated sludge plants are secondary wastewater treatment systems used to mitigate water pollution. This biological process utilizes a community of aerobic microorganisms (bacteria and protozoa) to decompose organic matter present in sewage or industrial wastewater, significantly lowering the Biochemical Oxygen Demand (BOD) before the treated water is safely discharged back into natural water bodies.

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Activated sludge plants are used to reduce:
A
water pollution.
B
noise pollution.
C
thermal pollution.
D
air pollution.

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Wastewater TreatmentWater PollutionEnvironmental Biology

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