132) The working conditions in imhoff tanks are

aerobic only

anaerobic only

aerobic in lower compartment and anaerobic in upper compartment

anaerobic in lower compartment and aerobic in upper compartment

Answer is:

anaerobic in lower compartment and aerobic in upper compartment

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133) In facultative stabilization pond, the sewage is treated by

aerobic bacteria only

algae only

dual action of aerobic bacteria and anaerobic bacteria

sedimentation

Answer is:

dual action of aerobic bacteria and anaerobic bacteria

134) The detention period for oxidation ponds is usually kept as

4-8 hours

24 hours

10 to 15 days

3 months

Answer is:

10 to 15 days

135) Composting and lagooning are the methods of

sludge digestion

sludge disposal

sedimentation

filtration

Answer is:

sludge disposal

136) The main disadvantage of oxidation pond is that

large area is required for construction

maintenance and operation cost are high

BOD removal is very low

none of the above

Answer is:

large area is required for construction

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132) The working conditions in imhoff tanks are

anaerobic in lower compartment and aerobic in upper compartment

Environmental Engineering MCQ with Answers

Related Environmental Engineering MCQ with Answers

133) In facultative stabilization pond, the sewage is treated by

dual action of aerobic bacteria and anaerobic bacteria

134) The detention period for oxidation ponds is usually kept as

10 to 15 days

135) Composting and lagooning are the methods of

sludge disposal

136) The main disadvantage of oxidation pond is that

large area is required for construction

Environmental Engineering MCQ with Answers