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Waste Water Engineering

Waste Water Engineering
The gas evolved in sewers is

Hydrogen sulphide
Carbondioxide
Methane
All of these

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Waste Water Engineering
In detritus tanks,

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

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

Parabolic
Rectangular
New egged
Circular

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

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Waste Water Engineering
An inverted siphon is designed generally for

One pipe
Two pipes
Three pipes
Four pipes

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

80,000 to 100,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day

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