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(D) $1$. Biogas is produced by anaerobic bacteria,not aerobic bacteria,from animal excreta.$2$. Methanobacterium is an anaerobic bacterium,not aerobic

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Activated sludge is the correct source of aerobic bacteria in a sewage treatment plant.

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(D) $1$. Biogas is produced by anaerobic bacteria,not aerobic bacteria,from animal excreta.$2$. Methanobacterium is an anaerobic bacterium,not aerobic,found in the rumen of cattle.$3$. Biogas is a mixture of gases (mainly methane,$CO_2$,and $H_2$),not pure methane.$4$. In a sewage treatment plant,the primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of useful aerobic microbes into flocs (masses of bacteria associated with fungal filaments to form mesh-like structures). These flocs consume the major part of the organic matter in the effluent,significantly reducing the $BOD$. This mixture is then passed into a settling tank where the bacterial flocs are allowed to sediment. This sediment is called activated sludge.

Select the correct statement from the following.

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