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Question

Sewage contains which of the following wastes and impurities?


  1. Dissolved wastes

  2. Non-biodegradable wastes

  3. Suspended impurities

  4. Biodegradable impurities


Solution

The correct options are
A

Dissolved wastes


B

Non-biodegradable wastes


C

Suspended impurities


D

Biodegradable impurities


Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients and disease causing bacteria and other microbes. 
Sewage contains dissolved impurities such as fertilisers and suspended impurities such as human excreta. It also contains non-biodegradable wastes such as plastics, glass and biodegradable impurities such as food wastes.

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