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Waste Water Engineering

Waste Water Engineering
The gas evolved in sewers is

Methane
Carbondioxide
All of these
Hydrogen sulphide

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Waste Water Engineering
Which one of the following resists hydrogen sulphide corrosion?

Glazed stone wares
Asbestos cement
Glazed ware
R.C.C.

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.12 cumec
0.10 cumec
0.20 cumec
0.15 cumec

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Waste Water Engineering
The sludge does not contain waste water from

Toilets
Kitchen sinks
Wash basins
Bath rooms

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Waste Water Engineering
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

Q/L
Q/(B × D)
Q/(L × D)
Q/(B × L)

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Waste Water Engineering
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

2.5
1.5
2
3

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