Select the correct statement from the following (a) Bio-gas is produced by the activity of aerobic bacteria on animal waste
Select the correct statement from the following
(a) Bio-gas is produced by the activity of aerobic bacteria on animal waste
(b) Methanobacterium is an aerobic bacterium found in rumen of cattle
(c) Bio-gas, commonly called gobar gas, is pure methane
(d) Activated sludge-sediment in settlement tanks of sewage treatment plant is a right source of aerobic bacteria
1 Answers
Correct Option (d) Activated sludge-sediment in settlement tanks of sewage treatment plant is a right source of aerobic bacteria
Explanation:
Out of the following statements (d) is correct
because activated sludge is a process dealing with the treatment of sewage and industrial waste waters. Atmospheric air or pure oxygen is introduced to a mixture of primary treated or screened sewage (or industrial waste water) combined with organisms to develop a biological flock, which reduces the organic content of the sewage. Sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria because small amounts are used as inoculum in secondary treatment or biological treatment stage of sewage treatment.