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Environmental Engineering - Interview Questions and Answers

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31. The biochemical treatment of sewage effluents is essentially a process of
A. oxidation
B. dehydration
C. reduction
D. alkalinization
Explanation:
32. The detention period for oxidation ponds is usually kept as
A. 4-8 hours
B. 24 hours
C. 10 to 15 days
D. 3 months
Explanation:
33. The gas from sludge digestion tank is mainly composed of
A. nitrogen
B. carbon dioxide
C. hydrogen sulphide
D. methane
Explanation:
34. Sludge volume index is defined as the ratio of
A. percentage of sludge by volume to percentage of suspended solids by weight
B. percentage of sludge by volume to percentage of total solids by weight
C. percentage of suspended solids by weight to percentage of sludge by volume
D. percentage of total solids by weight to percentage of sludge by volume
Explanation:
35. Alkalinity in water is expressed as milli-grams per litre in terms of equivalent
A. calcium carbonate
B. magnesium carbonate
C. sodium carbonate
D. calcium hydroxide
Explanation:
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