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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1000
4000
4,00,000
1,00,000

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Environmental Engineering
Settling velocity increases with

Temperature of liquid
Depth of tank
Specific gravity of solid particles
Size of particles

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Environmental Engineering
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

75
100
50
59

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Environmental Engineering
The water carriage system of collection of waste product

All of these
Creates hygienic problem
Is cheaper in initial cost than dry conservancy system
Requires treatment before disposal

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Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Rainfall + 6 DWF
Equal to rainfall
Rainfall + 2 DWF
Rainfall + DWF

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Environmental Engineering
The overflow rate for plain sedimentation tanks is about

1500 to 2000 liters/hour/m²
1000 to 1250 liters/hour/ m²
1250 to 1500 liters/hour/m²
500 to 750 liters/hour/ m²

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