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Waste Water Engineering

Waste Water Engineering
The discharge per unit plan area of a sedimentation tank, is generally called

Surface loading
All of these
Over flow rate
Over flow velocity

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Phenol-di-sulphuric acid
Adding potassium permanganate
Boiling
Adding sulphuric acid

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Waste Water Engineering
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

30 m
45 m
75 m
20 m

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Waste Water Engineering
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

25 cm
50 cm
40 cm
20 cm

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Waste Water Engineering
In sewers the gas generally found, is

Hydrogen sulphide (H2S)
All listed here
Methane (CH4)
Carbon dioxide (CO2)

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Waste Water Engineering
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

0.5
0.25
0.05
0.1

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