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Waste Water Engineering

Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

75 to 80%
65 to 70%
0.85
70 to 75%

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Bio-Chemical Oxygen Demand (B.O.D.)
None of these
Chemical Oxygen Demand (C.O.D.)
Dissolved Oxygen (D.O.)

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Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Skin cancer
Heart disorder
Lung cancer
Bronchitis

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Waste Water Engineering
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

100 cm
120 cm
110 cm
150 cm

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Waste Water Engineering
A circular sewer section is preferred to because

All listed here
It provides maximum hydraulic mean depth
It is cheaper in construction
It provides maximum area for a given perimeter

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Waste Water Engineering
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

Need not be sunk
Should be sunk by 20 cm
Should be sunk by 50 cm
Should be kept 20 cm above the adjacent portion

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