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Waste Water Engineering

Waste Water Engineering
The rate of accumulation of sludge per person per year, is

25 litres
15 litres
10 litres
20 litres

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Waste Water Engineering
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Methane
Oxygen
Hydrogen sulphide
Carbon dioxide

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Ammonia
Carbon monoxide
Methane
Carbondioxide

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

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

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Waste Water Engineering
In olden days the type of section adopted in trunk and out fall sewers was

Egg shaped
Circular shaped
Parabolic shaped
Horse shoe shaped

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Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

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

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