Paper 1 · People, Development and Environment
UGC NET December 2021 June 2022 (11.07.2022) Shift-II
Which one of the following is a chemical treatment process of waste water treatment?
ASedimentation
BNeutralisation ✓ Correct
CAeration
DAdsorption
Correct answer: (B) Neutralisation — Neutralisation is a chemical treatment process, so option B is correct.
Explanation
★Neutralisation is a chemical treatment process, so option B is correct.
★In neutralisation, an acid and a base react so hydrogen and hydroxide ions form water.
★This adjusts the pH of waste water to a safe, near neutral range.
★Because it changes substances through a chemical reaction, it is a chemical method.
★Sedimentation lets solids settle by gravity, a physical process.
★Aeration adds oxygen physically, and adsorption binds molecules to a surface physically.
★Waste water treatment combines physical, chemical, and biological stages in sequence.
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