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Standard IX
Biology
Tuberculosis
Distinguish b...
Question
Distinguish between roles of flocs and anaerobic sludge digesters in sewage treatments.
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Solution
Flocks contain aerobic microbes that grow in aeration tank during secondary treatment of effluent.
In anaerobic digester anaerobic type of bacteria grow and digest and produce a mixture of gases such as methane, hydrogen sulfide, and carbon dioxide.
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Q.
Distinguish between the roles of flocks and anaerobic sludge digesters in sewage treatments.
Q.
Which of the following is pumped into anaerobic sludge digesters during the sewage treatment?
Q.
(a) What would happen if a large volume of untreated sewage is discharged into a river?
(b) In what way anaerobic sludge digestion is important in sewage treatments?
Q.
Study the given differences between primary sludge and activated sludge and select the incorrect ones.
Primary Sludge
Activated sludge
(i)
It is sludge formed during primary sewage treatment.
It is sludge formed during secondary sewage treatment.
(ii)
It possesses flocs of decomposer microbes.
It does not possess flocs of decomposer microbes.
(iii)
It does not require aeration.
Formation of activated sludge requires aeration.
(iv)
A lot of decomposition occurs during formation of primary sludge.
Very little decomposition occurs during formation of activated sludge.
Q.
Anaerobic sludge digesters and inoculums are part and parcel of _____________.
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