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Microbiology of Drinking Water

Microbiology of Drinking Water
Drinking water is obtained either from surface sources such as rivers, lakes or from underground. Such natural waters are likely to be polluted. Although water purification systems envisage protection from pollution, sometimes, the water supply can become a potential carrier of pathogenic organisms and endanger public health. A number of diseases such as cholera, typhoid, viral hepatitis etc., are known to be water borne.

These pathogens are commonly transmitted through drinking water and cause infection of the intestinal tract. It is therefore, necessary to employ treatment facilities to purify water and to provide safe drinking water (Potable water).

The main operations employed in water purification to produce potable water are (i) sedimentation, (ii) Filtration, and (iii) chlorination. Most microorganisms are removed during coagulation with aluminium sulphate and sand filtration and subsequent treatment of water with chlorine (0.2-1 mg free chlorine per litre) will ensure its potability

 

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