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Waste Water Engineering

Waste Water Engineering
The sewage treatment in septic tanks is due to

Aerobic decomposition
None of these
Parasitic decomposition
Anaerobic decomposition

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

H₂SO₄
HCl
None of these
HNO₃

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

20% less
10% less
20% more
10% more

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Waste Water Engineering
The standard B.O.D. of water is taken for

3 days
2 days
5 days
1 day

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Waste Water Engineering
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Inverted syphon
all of these
Sag pipe
Depressed sewer

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Waste Water Engineering
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

Half full
Two third full
Three fourth full
Full depth

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