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Waste Water Engineering

Waste Water Engineering
The coagulant which is generally not used for treating the sewage, is

Ferric chloride
Alum
Chlorinated coppers
Ferric sulphate

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Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

Glazed bricks sewers
Cast iron sewers
Cement concrete sewers
Stone ware sewers

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Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Rivers
Lakes
None of these
Seas

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Waste Water Engineering
Dry water flow in a combined sewer, is

Storm water
Inclusive of domestic and industrial sewage but excludes storm water
Domestic sewage
Industrial sewage

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

10000
5000
1000
100

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Waste Water Engineering
The screens are fixed

At an angle 30° to 60° to the direction of flow
Perpendicular to the direction of flow
Parallel to the direction of flow
None of these

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