NEET Biology question

A small part of the activated sludge from the settling tank in a sewage treatment plant is recycled back into the aeration tank chiefly to serve as

(A)Fuel for the biogas plant
(B)Inoculum, to seed the aeration tank with the required microbial populationCorrect
(C)A chemical disinfectant
(D)Fertiliser for nearby fields directly

Answer: (B)

Solution

NCERT specifically notes that a small part of activated sludge is pumped back into the aeration tank as inoculum,

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Question ID VK-124317