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Waste Water Engineering

Waste Water Engineering
No treatment of the sewage is given if dilution factor is

Less than 150
Between 150 to 200
More than 500
Between 200 to 300

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

2 days
7 days
14 days
12 days

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Waste Water Engineering
If q is the average sewage flow from a city of population P, the maximum sewage flow

Q = [(4 + )/(18 + )] q
Q = [(18 + P)/(4 + )] q
Q = [(5 + )/((15 + )] q
Q = [(18 + )/(4 + )] q

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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
The recommended detention period for grit chambers is

5 minutes
3 minutes
1 minute
2 minutes

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

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

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