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Waste Water Engineering

Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

O₂
CO₂
CO₂
SO₂

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Waste Water Engineering
In detritus tanks,

Flow velocity is kept 0.09 m/sec
Detention period is kept 3 to 4 minutes
All listed here
Organic and inorganic materials are separated

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

30 m
20 m
16 m
24 m

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

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Hydrogen sulphide
Carbon dioxide
Oxygen
Methane

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

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