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Waste Water Engineering

Waste Water Engineering
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

5.5 m
7 m
6.5 m
5 m

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

All of these
Initial demand
Carbonaceous demand
First stage demand

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Waste Water Engineering
The effluent of a septic tank is

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

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Waste Water Engineering
The spacing of bars of perforations of fine screens used for the treatment of sewage, is

3 to 5 mm
2 to 3 mm
8 to 10 mm
5 to 8 mm

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Waste Water Engineering
The minimum diameter of sewer to be adopted is

12.5 cm
10 cm
15 cm
25 cm

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Waste Water Engineering
Dry weather flow is:

Average daily rate of flow
Average monthly rate of flow
Water supply allowance per capita
Average annual rate of flow

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