Question

How is drinking water purified from the following impurities?
(a) Suspended impurities
(b) Dissolved impurities
(c) Bacterial impurities

Answer 1

• Filtration is a physical process that removes these impurities from water by percolating it downward through a layer or bed of porous, granular material such as sand. Suspended particles become trapped within the pore spaces of the filter media, which also remove harmful protozoa and natural colour.
• If you want to make freshwater out of seawater (the impurity being large quantities of inorganic salts) in large quantities, the options are distillation (boiling it and capturing and cooling the vapor) or reverse osmosis (pushing the water very hard against a membrane that will only let water molecules through). Both of these are quite energy expensive processes. In smaller quantities you could also freeze the water, wash the ice and then thaw it.
• Despite chlorination removing harmful bacteria, drinking water will still contain live microorganisms. Bacteria is typically controlled in drinking water through the use of chlorine or other similar disinfectants, however, once these are removed during the water purification process, bacteria can proliferate.
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Answer 2

Answer:

yes rain water is free from impurities. Impurities and salts present in water on earth are left behind during vaporisation by the sun.

Explanation:

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