An alum is a hydrated double sulfate salt of aluminium. Alum is used in industrial and waste water treatment. Alum is used as a flocculating agent in the purification of drinking water and waste water treatment plants, and also in paper manufacturing plant. Alum removes unwanted colour and turbidity from water supplies. Alum when added to raw water reacts with the bicarbonate alkalinities present in water and forms a gelatinous precipitate. This floc attracts other fine particles and suspended material in raw water and settles down at the bottom of the container.
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