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Waste Water Engineering

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

All listed here
Oxidation
Sedimentation
Screening

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Waste Water Engineering
The effluent of a septic tank is

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

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Waste Water Engineering
Clogging of sewers, is caused due to

Greasy and oily matters
Low discharge
Silting
All of these

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Waste Water Engineering
A circular sewer section is preferred to because

It is cheaper in construction
All listed here
It provides maximum area for a given perimeter
It provides maximum hydraulic mean depth

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Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

70 to 75%
0.85
75 to 80%
65 to 70%

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Waste Water Engineering
The pH value of fresh sewage is usually

Equal to 7
Less than 7
Equal to zero
More than 7

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