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What is the pH at which recarbonation should be done?

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+2 votes
in Environmental Engineering by (81.4k points)
What is the pH at which recarbonation should be done?

(a) 7

(b) 4.5

(c) 8.2

(d) 9.5

I have been asked this question in a job interview.

My enquiry is from Lime Soda Process in division Water Softening of Environmental Engineering

1 Answer

+1 vote
by (693k points)
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Best answer
Correct choice is (d) 9.5

The best I can explain: The carbonation of water containing excess lime will form a colloidal precipitate of calcium carbonate that is less soluble at pH 9.4-9.6, so the recarbonation should not be done below this range.

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