Answer :

purification of water takes place in several steps in water treatment plant:

Screening: when the water source is a lake or river, large contaminants such as plants, polythene or fish are removed.

Coagulation: chemicals are added to attract dirt particles and make them sink to the bottom of the tank.

Sedimentation: As water becomes still, these dirt particles are removed.

Filtration: water passes through several layers of charcoal to filter out remaining particles.

Disinfection: water goes in a tank and chlorine or other disinfecting chemicals are added to it to kill bacteria.

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