A sewage treatment process in which a port of decomposer bacteria present in the waste is recycled into the starting of the process is called\tcyclic treatment\tactivated sludge treatment\ttertiary treatment\tphysical treatment

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Correct is 2. Activated sludge treatment
The activated sludge treatment involves the decomposotion of organic matter through sewage fungus and decomposer bacteria by aeration in oxidation tanks. This aeration helps in the oxidation of sludge.