Which among the following are the by-products of wastewater treatment?

Carbon dioxide and ozone

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Carbon monoxide and sludge

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Biogas and sludge

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Biogas and ozone

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Solution

The correct option is C
Biogas and sludge

When wastewater is allowed to settle in a large tank, solids like mud, faeces settle at the bottom of the tank. This is called sludge. It is transferred to a separate tank where it is decomposed by anaerobic bacteria. Biogas is produced during this process. Dried sludge can be used as a manure.

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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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