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Bacteria in Sewage

Which of the ...

Question

Which of the following is put into the anaerobic sludge digester for further sewage treatment?

A

Effluents of primary treatment

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B

Activated sludge

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C

Primary sludge

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D

Floating debris

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Solution

The correct option is B Activated sludge
Activated sludge is formed during secondary sewage treatment and it contains flocs of decomposer microbes. Major portion of activated sludge is pumped into large tanks called anaerobic sludge digesters. So, here other kinds of bacteria which grow anaerobically, digest the fungi, bacteria of the sludge along with other organic mass.

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Q. Which of the following is pumped into anaerobic sludge digesters during the sewage treatment?

Q. Distinguish between roles of flocs and anaerobic sludge digesters in sewage treatments.

Q. In one method of sewage treatment, the sewage flows into a _______ tank in which anaerobic bacteria decompose the waste.

Q. How many of the following statements are correct with respect to the activated sludge?

I - It is composed of soil and small pebbles that are removed during the primary treatment of the sewage
II - It can be used for biogas production
III - It is fed into anaerobic sludge digesters
IV - It is obtained at the end of the oxidation of organic wastes during the secondary treatment of the sewage

Q. Assertion: A major part of the activated sludge is pumped into large tanks called anaerobic sludge digesters.
Reason: During anaerobic digestion, the anaerobic bacteria digest the organisms present in the primary sludge.

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