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Waste Water Engineering

Waste Water Engineering
Sewer manholes are generally provided at

All of these
The change of gradient
The change of direction
The junctions of sewers

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Waste Water Engineering
In very first stage of decomposition of the organic matter in sewage

Nitrites are formed
Carbondioxide is formed
Nitrates are formed
Ammonia is formed

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

200 mg/l
100 mg/l
400 mg/l
300 mg/l

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Waste Water Engineering
A drop manhole is provided if

A sewer drops from a height
A branch sewer joins the main sewer at higher level
None of these
A lamp is inserted to check obstruction

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Waste Water Engineering
1000 kg of sewage contains

0.112 kg in suspension
0.225 kg in solution
Both A and C of above
0.112 kg in solution

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

40 to 60%
30 to 40%
80 to 90%
60 to 80%

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