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Waste Water Engineering

Waste Water Engineering
The flow velocity in detritus tanks is

1.25 m/sec
None of these
0.09 m/sec
0.05 m/sec

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

All listed here
Length of the tank is normally kept 4 to 5 times the width
Maximum horizontal flow velocity is limited to 0.3 m/minute
Width of the tank is normally kept about 6 m

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Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Both (A) and (B)
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
Neither (A) nor (B)
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

30 m
24 m
16 m
20 m

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Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 500 upward
1 in 100 downward
1 in 100 upward
1 in 503 upward

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

Carbonaceous demand
All of these
Initial demand
First stage demand

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