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Removal of manganese from water takes place at a pH of ______

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Removal of manganese from water takes place at a pH of ______

(a) 1.5

(b) 3

(c) 6

(d) 9.4

This question was posed to me by my college professor while I was bunking the class.

This key question is from Removal of Iron, Manganese, Colour, Odour and Taste in chapter Miscellaneous Treatment Methods of Environmental Engineering

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Correct answer is (d) 9.4

To elaborate: Removal of manganese from water takes place at a pH between 9.4 to 9.6. Pre- chlorination up to 0.7 to 1 mg/l affect the oxidation and precipitation of manganese.

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