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Question

Animal wastes are impurities while metals are impurities present in the sewage.

A
organic
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B
inorganic
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C
acidic
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D
basic
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Solution

The correct options are
A organic
B inorganic
Animal wastes are organic impurities present in the wastewater. They get decomposed by microorganisms in the presence of oxygen. Metals present in wastewater are inorganic impurities. While treating wastewater they are removed in the screening phase.

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