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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