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Waste Water Engineering

Waste Water Engineering
The minimum diameter of sewer to be adopted is

15 cm
12.5 cm
25 cm
10 cm

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

Depth of 0.9 m to 1.20 m is kept
Flow velocity 0.15 m to 0.3 m/sec is kept
All of these
One minute of detention period is kept

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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
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

House sewer
Lateral sewer
Sewer outfall
Branch sewer

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Waste Water Engineering
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

1 in 60
None of these
1 in 120
1 in 100

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Waste Water Engineering
In very first stage of decomposition of the organic matter in sewage

Nitrates are formed
Ammonia is formed
Carbondioxide is formed
Nitrites are formed

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