Explain the various processes that take place at the water treatment plant.

Discussion in 'CBSE Class 7 Science Help' started by g mahesh, Nov 11, 2013.

  1. g mahesh

    g mahesh Member

    (i) Collect the sewage and dirty water in a tank. Shake it well and let the mixture stand in the sun for two days. Pour it into another utensil.

    (ii) Use an aerator and allow several hours for aeration. Leave the aerator attached overnight. When aeration is
    complete pour it into another utensil.

    (iii) Filter the sample with the help of filter paper, sand, fine gravel and finally medium gravel.

    (iv) Add chlorine tablets or bleaching powder in the filtered water. This process is called chlorination.

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