Select the correct statement from the following

Bio-gas is produced by the activity of aerobic bacteria on animal waste

Methanobacterium is an aerobic bacterium found in rumen of cattle

Biogas, commonly called gobar gas, is pure methane

Activated sludge-sediment in settlement tanks of sewage treatment plant is a right source of aerobic bacteria

Solution

Biogas, commonly called gobar gas, is pure methane

Activated sludge is a process dealing with the treatment of sewage and industrial waste waters. Atmospheric air on pure oxygen is introduced to a mixture of primary treated or screened sewage (or industrial waster water) combined with organisms to develop a biological flock, which reduces the organic content of the sewage. Sediment is settlement tanks of sewage treatment plant is a rich source of aerobic bacteria because small amounts are used as inoculum in secondary treatment of biological treatment stage of sewage treatment.

Some More Questions From Environmental Issues Chapter

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Environmental Issues

Some More Questions From Environmental Issues Chapter

Which of the following pollutants is not produced by exhaust of motor vehicles ?

What is the term for the inflammation of cornea due to high absorption of UV-B radiation :

Smog is a mixture of :

WHO’s recommendations about the industrial noise limit is of :

Which of the atmospheric layer contains ozone layer ?

The amount of dissolved oxygen required by the microorganisms to degrade the organic wastes present in water is called ?

The cause of acid rain is :

Which one of the following causes ozone depletion ?

What disease is caused due to consumption of fishes captured from water contaminated with mercury ?

Which one of the following is not a green-house gas ?

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