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Arrange the following steps of purification …

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Arrange the following steps of purification of water in the correct order:-- adding alum, treatment with chlorine, sieving

    • Posted by Riyan Deshmukh 5 years, 10 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Meghna Thapar 5 years, 10 months ago

    Purification of drinking water is done at the following four stages -

    1. Water from a river or lake is brought through canals or long pipes to the water work, where it is mixed with the required quantities of alum and soda lime solutions. These substances react with one another to form aluminium hydroxide, a jelly-like, sticky solid.
    2. It is then pumped into big settling tanks, where most of the suspended impurities settle down in two or three days.
    3.  The  clear  water  still  containing  some  suspended  matter  is  passed  through  successive  filters  of boulders, gravel, coarse sand and fine sand.
    4. The clear water from the filters is chlorinated and then passed to the reservoirs for distribution in the city.

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