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

organic

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inorganic

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acidic

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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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Question 15

Animal waste, oil and urea are some of the organic impurities present in sewage. Name two more organic impurities present in sewage.

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