In which stage of water purification, the solid matter settles down and the alum is added to water to decrease the pH value?

Filtration

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Chlorination

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Aeration

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Coagulation

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Solution

The correct option is D
Coagulation
This is an important step in the process of water purification in a water treatment plant. This enables the sedimentation of solid matter present in water. Alum is added for this. When alum is added the pH value of water decreases. Lime is added to regulate the pH value.

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