Select the correct statement from the following.

  • A
    Activated sludge sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria.
  • B
    Biogas is produced by the activity of aerobic bacteria on animal wastes.
  • C
    Methanobacterium is an aerobic bacterium found in rumen of cattle.
  • D
    Biogas,commonly called gobar gas,is pure methane.

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Given below are two statements: Based on them,select the correct option.
Statement $I$: Activated sludge is obtained in the grit chamber.
Statement $II$: Activated sludge is pumped into an anaerobic digester.

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