Discussion
The sewage treatment plant which part require large area :-
Answer: C
The unit that needs a large area is the Oxidation pond.
An oxidation (stabilisation) pond treats sewage in a shallow open basin, typically 1 to 1.5 m deep, where algae supply oxygen through photosynthesis and bacteria break down the organic matter. Because it depends on sunlight and a long detention time, it needs a large land area, which is why it suits small towns where land is cheap.
Biological (trickling) filters and septic tanks are compact units that treat sewage in a much smaller footprint.
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