Purification of water
Purification of water
In big towns, drinking water is obtained from ponds, rivers or lakes. This water is never pure. To make it potable, the water has to pass through a series of purifying processes as described below.
1. Sedimentation: The water from pond, river or lake is led into a sedimentation tank. A small amount of potash alum is added and the water is allowed to stand. Muddy substances present in water settle down more easily in the presence of the alum. The clear liquid is now pumped out into a filtration tank.
2 Filtration tank: In this tank, the water has to pass through the layers of charcoal, gravel and fine sand. Water gets filtered here and becomes free from suspended impurities. This water is then led into the chlorination tank.
3. Chlorination tank: In this tank,water is treated with liquid chlorine or bleaching powder. Here, bacterial germs, if any, are killed and the water becomes potable. Water is then supplied to different parts of the town through pipeline.
Purification of Drinking Water:
In cities, drinking water is supplied from water works. A number of dissolved and suspended impurities are to be removed before making it fit for drinking purposes.
The process is consist of number of steps like :-
Aeration:
Storage or settling:
Coagulation :-
Filtration:
Disinfection :-
Which of the following is a precipitating agent ? | |||
| Right Option : D | |||
| View Explanation | |||
After alum is added to water, the next step in the water treatment process is usually: | |||
| Right Option : A | |||
| View Explanation | |||
During purification of water muddy substances present in water in a sedimentation tank settle down more easily in the presence of the __________________________. | |||
| Right Option : B | |||
| View Explanation | |||
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