Which of the following statements is correct?

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(D) The correct statement is $D$. $A$ is incorrect because biogas is produced by anaerobic bacteria (methanogens). $B$ is incorrect because Methanobac

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The sediment in the settling tanks of sewage treatment plants,called activated sludge,contains a large population of aerobic bacteria.

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(D) The correct statement is $D$. $A$ is incorrect because biogas is produced by anaerobic bacteria (methanogens). $B$ is incorrect because Methanobacterium are anaerobic,not aerobic. $C$ is incorrect because biogas is a mixture of gases (primarily methane,$CO_2$,and $H_2$),not pure methane. $D$ is correct because during secondary treatment,the activated sludge in the settling tank is rich in aerobic bacteria which are used to digest organic matter.

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