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Waste Water Engineering

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/(B × D)
Q/(B × L)
Q/(L × D)
Q/L

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Waste Water Engineering
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is

80 cm
50 cm
100 cm
90 cm

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

2 days
7 days
14 days
12 days

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

10 days
20 days
30 days
60 days

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Waste Water Engineering
The effluent of a septic tank is

Fit for discharge into any open drain
None of these
Foul and contains dissolved and suspended solids
As good as that from a complete treatment

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Waste Water Engineering
In sewers the gas generally found, is

Hydrogen sulphide (H2S)
Methane (CH4)
All listed here
Carbon dioxide (CO2)

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