Which property of alum is used to purify water by loading?
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Alum is used to coagulate suspended particles, algae, protozoa, viruses, bacteria, and some metal ions (such as iron and manganese) into larger particles. The resulting "sludge" is then removed. Ozone may be bubbled through the water to kill remaining bacteria, viruses, and protozoa.
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Remember that When alum is added to raw water, it reacts with the bicarbonate alkalinities present in the water and forms a gelatinous precipitate. And this attracts other fine particles and raw water suspended material, and settles down at the bottom of the container.
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