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Waste Water Engineering

Waste Water Engineering
Primary treatment of sewage consists of removal of

Large suspended organic solids
Oil and grease
Floating materials
Sand and girt

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Waste Water Engineering
In sewers the highest non-scouring velocity is achieved in

Cast iron sewers
Glazed bricks sewers
Cement concrete sewers
Stone ware sewers

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

Carbonaceous demand
All of these
Initial demand
First stage demand

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Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

5 kg to 7.5 kg
7.5 kg to 10 kg
0.5 to 1.0 kg
1 kg to 2.0 kg

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

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Waste Water Engineering
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

Full depth
Half full
Two third full
Three fourth full

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