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Which form of solute stabilization occurs when effluent passes through limestone?

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Which form of solute stabilization occurs when effluent passes through limestone?

(a) Chlorination

(b) Liming

(c) Re-carbonation

(d) Super-chlorination

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I would like to ask this question from Types of Unit Operations topic in chapter Unit Operations for Wastewater Treatment, Preliminary Treatment of Environmental Engineering

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Right option is (b) Liming

The best explanation: When effluent passes through limestone, carbon dioxide in excess gets converted into soluble bicarbonate.

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