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WASTE WATER ENGINEERING

Waste Water Engineering
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

1.39 m
1.49 m
1.69 m
1.59 m

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Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

15 days
30 days
60 days
90 days

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Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

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

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Waste Water Engineering
A manhole is generally provided at each

Change of gradient
Junction
Bend
All of these

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Dissolved Oxygen (D.O.)
Bio-Chemical Oxygen Demand (B.O.D.)
Chemical Oxygen Demand (C.O.D.)
None of these

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