tank is used in purification of water, to remove heavy solid impurities by allowing them to settle down at the bottom.

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Filtration

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Sedimentation

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Solution

The correct option is C Sedimentation
Sedimentation is the process of allowing heavy solid particles of suspensions to settle down in the mixture, under the effect of gravity. The particles that settle down in the mixture are the sediments.
In water treatment plants, sedimentation tank is used to remove heavy solid impurities that are insoluble in the water.

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