129) Which of the following unit works in anaerobic conditions?

sludge digestion tank

sedimentation tank

activated sludge treatment

trickling filters

Answer is:

sludge digestion tank

Environmental Engineering MCQ with Answers

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130) Septic tank is a i) settling tank ii) digestion tank iii) aeration tank The correct answer is

only (i)

(i) and (ii)

(i) and (iii)

only (iii)

Answer is:

(i) and (ii)

131) The maximum efficiency of BOD removal is achieved in

oxidation pond

oxidation ditch

aerated lagoons

trickling filters

Answer is:

oxidation ditch

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

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

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129) Which of the following unit works in anaerobic conditions?

sludge digestion tank

Environmental Engineering MCQ with Answers

Related Environmental Engineering MCQ with Answers

130) Septic tank is a i) settling tank ii) digestion tank iii) aeration tank The correct answer is

(i) and (ii)

131) The maximum efficiency of BOD removal is achieved in

oxidation ditch

132) The working conditions in imhoff tanks are

anaerobic in lower compartment and aerobic in upper compartment

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

dual action of aerobic bacteria and anaerobic bacteria

Environmental Engineering MCQ with Answers