Where is methane produced in the wastewater treatment?

Activated sludge system

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Anaerobic digestion

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Trickling filters

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Chlorination

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Solution

The correct option is B Anaerobic digestion
By using anaerobic digestion in the treatment of wastewater sludge, methane gas is produced and it is known as biogas.

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

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