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Waste Water Engineering

Waste Water Engineering
The first stage of neutral process of sludge digestion, is

None of these
Alkaline fermentation
Acid regression
Acid fermentation

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Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Neither (A) nor (B)
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
Both (A) and (B)

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Waste Water Engineering
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

Bazin
William-Hazen
Kutter
Crimp and Bruges

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Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

2.5 to 3.0 m/sec
3.5 to 4.5 m/sec
4.5 to 5.5 m/sec
3.0 to 4.0 m/sec

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

All listed here
Width of the tank is normally kept about 6 m
Length of the tank is normally kept 4 to 5 times the width
Maximum horizontal flow velocity is limited to 0.3 m/minute

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Waste Water Engineering
Removal of oil and grease from sewage, is known

Filtration
Skimming
Screening
None of these

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