Sludge separated from wastewater can be turned into a useful commodity. Which of the following is one such commodity?

Artificial Soil

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Biogas

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Animal fodder

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All of the above

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Solution

The correct option is B
Biogas

Sludge can be decomposed to produce biogas. The biogas can be used as fuel for cooking and producing electricity.

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Question 3

Which of the following is/are products of wastewater treatment?
(a) Biogas
(b) Sludge
(c) Both biogas and sludge
(d) Aerator

Sludge in separate tanks is decomposed to get biogas by

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