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Waste Water Engineering

Waste Water Engineering
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

2.30 m
2.40 m
2.45 m
2.50 m

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

10 days
60 days
20 days
30 days

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Sedimentation
All listed here
Oxidation
Screening

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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 × D)
Q/(B × L)
Q/L
Q/(B × D)

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5

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Waste Water Engineering
In detritus tanks,

All listed here
Organic and inorganic materials are separated
Detention period is kept 3 to 4 minutes
Flow velocity is kept 0.09 m/sec

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