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Environmental Engineering - Interview Questions and Answers

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36. The maximum efficiency of BOD removal is achieved in
A. oxidation pond
B. oxidation ditch
C. aerated lagoons
D. trickling filters
Explanation:
37. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
A. 4.5 to 6.0
B. 6.5 to 8.0
C. 8.5 to 10.0
D. 10.5 to 12.0
Explanation:
38. The main disadvantage of oxidation pond is that
A. large area is required for construction
B. maintenance and operation cost are high
C. BOD removal is very low
D. none of the above
Explanation:
39. The working conditions in imhoff tanks are
A. aerobic only
B. anaerobic only
C. aerobic in lower compartment and anaerobic in upper compartment
D. anaerobic in lower compartment and aerobic in upper compartment
Explanation:
40. Most of the bacteria in sewage are
A. parasitic
B. saprophytic
C. pathogenic
D. anaerobic
Explanation:
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