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In which process, excess lime is converted into bicarbonate?

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In which process, excess lime is converted into bicarbonate?

(a) Chlorination

(b) Liming

(c) Re-carbonation

(d) Super-chlorination

I had been asked this question during an interview.

The question is from Types of Unit Operations topic in chapter Unit Operations for Wastewater Treatment, Preliminary Treatment of Environmental Engineering

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Best answer
The correct answer is (c) Re-carbonation

Best explanation: By Re-carbonation of water softened by excess lime treatment, excess lime is converted into bicarbonate.

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