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Question

Which of the following is a part of inorganic impurity in sewage?


A

Urea

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B

Phosphates

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C

Vegetable waste

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D

Faeces

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Solution

The correct option is B

Phosphates


Organic impurities generated from organic material such as food, garden, etc, in sewage include animal waste, urine, oil, vegetable and fruit waste, faeces and herbicides. Inorganic impurities (all impurities excluding organic) include phosphates, nitrates and metals.


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