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Waste Water Engineering

Waste Water Engineering
Primary treatment of sewage consists of removal of

Sand and girt
Oil and grease
Floating materials
Large suspended organic solids

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Waste Water Engineering
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

2.50 m
2.40 m
2.30 m
2.45 m

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 2H3p/3 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 3H3p/2 Z5

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Waste Water Engineering
Sewer pipes need be checked for

None of these
Both A and B
Minimum flow
Maximum flow

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Waste Water Engineering
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

150 cm
110 cm
120 cm
100 cm

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Waste Water Engineering
To maintain aerobic biological activity, the moisture content of the compost mass should be about

0.5
0.6
0.45
0.55

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