How is water purified on a large scale at water works? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply.

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Solution

The water is purified at a large scale in water treatment plants:
Following three steps are involved for purification of water at large scale:
1. Sedimentation: In this process, all the large impurities are removed from the water.
2. Filtration: In this process, the water is filtered through different types of filters that trap the minute impurities present in the water.
3. Disinfection: In this process, the water is disinfected to remove the remaining microorganisms from the water.

Water purification on a large scale can be done as shown below:

Chlorine gas is passed through the water to kill germs in the drinking water supply.

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