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Question 3

Sewage also contains some nutrients and bacteria. Comment.


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Solution

Sewage is a complex mixture that contains suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease-causing bacteria and other microbes.

  • The nutrients present in sewage are phosphorus and nitrogen.

  • The bacteria present in sewage include those bacteria which cause water-borne diseases such as cholera and typhoid.


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