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Study the following statements and selec...

Study the following statements and select the incorrect ones
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process
(iii) Activated sludge sediment is a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas, commonly called as gobar gas is pure methane.

A

(i) and (ii)

B

(ii) and (iv)

C

(ii) and (iii)

D

(iii) and (iv)

Text Solution

Verified by Experts

The correct Answer is:
B
In secondary sewage treatment there is a vigorous growth of aerobic bacteria that consume the major part of the organic matter in the effluent. Biogas is a mixture of many gases in which certain bacteria such as methanogens grow anaerobically on cellulose material produce a large amount of methane along with `CO_(2)` and `H_(2)`
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