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Waste Water Engineering

Waste Water Engineering
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1 in 20
1 in 10
1 in 15
1 in 5

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Waste Water Engineering
Chlorination of water is done for the removal of

Sediments
Suspended solids
Hardness
Bacterias

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Waste Water Engineering
If q is the average sewage flow from a city of population P, the maximum sewage flow

Q = [(5 + )/((15 + )] q
Q = [(18 + P)/(4 + )] q
Q = [(18 + )/(4 + )] q
Q = [(4 + )/(18 + )] q

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Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.5
2.65
2.55
2.25

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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
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

1 in 60
None of these
1 in 100
1 in 120

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