Sewage treatment process in which part of decomposer bacteria is recycled into starting of the process is called.
A
Cyclic treatment
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B
Primary treatment
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C
Tertiary treatment
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D
Activated sludge treatment
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Solution
The correct option is D Activated sludge treatment A part of the activated sludge is pumped back into the aeration tank to serve as an inoculum in activated sludge treatment.