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Waste Water Engineering

Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

All listed here
Typhoid
Dysentery
Cholera

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

None of these
H₂SO₄
HCl
HNO₃

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Waste Water Engineering
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

1.5
2.5
2
3

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Waste Water Engineering
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Chezy
Manning
Kutter
Bazin

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Waste Water Engineering
A rain sanitary sewer is constructed to carry

Storm sewage
Surface water
Sanitary sewage
Ground water

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

25,000 to 35,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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