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What is the use of alum in purification of drinking water?

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What is the use of alum in purification of drinking water?
posted Aug 21, 2017 by Pardeep Kohli

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1 Answer

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Chemical flocculant. Alum is used to clarify water by neutralizing the electrical double layer surrounding very fine suspended particles, allowing them to flocculate (stick together). After flocculation, the particles will be large enough to settle and can be removed.

answer Aug 23, 2017 by Shivaranjini
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