Paper 1 · People, Development and Environment
UGC NET December 2022 (24.02.2023) Shift-II
Which of the following are removed through the secondary water treatment process?
APolythene, tetra pack, etc.
BLarge suspended solids
CColloidal and dissolved organic matter ✓ Correct
DSettleable organic matters
Correct answer: (C) Colloidal and dissolved organic matter — Secondary treatment removes colloidal and dissolved organic matter, so that is the answer.
Explanation
★Secondary treatment removes colloidal and dissolved organic matter, so that is the answer.
★Water treatment works in stages, each removing different material.
★The primary stage removes large solids and settleable matter physically.
★The secondary stage uses biological action on the finer organic content.
★It removes the colloidal and dissolved organic matter left after primary treatment.
★So the secondary process removes colloidal and dissolved organic matter.
★So the answer is colloidal and dissolved organic matter.
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