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(D) The correct statement is $D$. Activated sludge in sediment tanks is a rich source of aerobic bacteria. $A$ is incorrect because $Methanobacterium$

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Activated sludge in sediment tanks is a rich source of aerobic bacteria.

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(D) The correct statement is $D$. Activated sludge in sediment tanks is a rich source of aerobic bacteria. $A$ is incorrect because $Methanobacterium$ is an anaerobic bacterium. $B$ is incorrect because biogas is produced by the activity of anaerobic bacteria,not aerobic bacteria. $C$ is incorrect because biogas is a mixture of gases (primarily $CH_4$,$CO_2$,and $H_2S$),not pure methane.

Select the correct statement from the following:

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