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Why is there a need for alkalinity during a coagulation process using alum? Explain by referring...

Why is there a need for alkalinity during a coagulation process using alum? Explain by referring to the chemical equation when alum is used.

Engineering   Civil-Engineering   
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Answer #1

ALKALINITY - COAGULATION RELATIONSHIPS

The coagulation of metallic salts releases hydrogen ions (H+) as well as coagulant species.

These H+ neutralise alkalinity. If the initial alkalinity of a water is low, coagulation will result in further reduction of pH. Since optimum pH values must be maintained for best coagulation and since alkalinity must be present for hydroxide floc formation, low alkalinity water must be added with lime [ Ca(OH)2] or soda ash [Na2CO3] to increase the alkalinity.

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