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Waste Water Engineering

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

None of these
HCl
HNO₃
H₂SO₄

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

20 m
75 m
45 m
30 m

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Waste Water Engineering
The gradient of sewers depends upon

Velocity of flow
Discharge
Diameter of the sewer
All listed here

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

2 days
14 days
12 days
7 days

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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 detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.285d + 0.011H)/Q
d (0.022d + 0.085H)/Q
d (0.785d + 0.011H)/Q
d² (0.011d + 0.785H)/Q

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