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Environmental Engineering

Environmental Engineering
The biochemical treatment of sewage effluents is essentially a process of

Reduction
Oxidation
Alkalinization
Dehydration

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Environmental Engineering
The minimum and maximum diameters of sewers shall preferably be

15 cm and 300 cm
30 cm and 450 cm
15 cm and 100 cm
60 cm and 300 cm

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank depends on

Both depth and surface area of tank
Surface area of tank
None of these
Depth of tank

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Environmental Engineering
The most commonly used sewer under culverts is

Horseshoe type sewer
Semi-elliptical sewer
Circular cast iron sewer
Circular brick sewer

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Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.35 to 0.60 mm
1.00 to 1.80 mm
0.25 to 0.35 mm
0.60 to 1.00 mm

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Environmental Engineering
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

More and more
More and less
Less and less
Less and more

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