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Question

Cleaning of sewage is a process of removing ____ from it.

A
oxygen
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B
vitamins
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C
pollutants
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D
minerals
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Solution

The correct option is C pollutants
Sewage is a complex mixture containing suspended solids, organic and inorganic impurities.
These pollutants are removed using physical, chemical, biological processes in a wastewater treatment plant before they are released into a water body.

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