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Waste Water Engineering

Waste Water Engineering
Pick up the incorrect size of stone ware sewers

None of these
82.5 cm
67.5 cm
52.5 cm

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Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

3.5 to 4.5 m/sec
2.5 to 3.0 m/sec
4.5 to 5.5 m/sec
3.0 to 4.0 m/sec

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Waste Water Engineering
The gas evolved in sewers is

Hydrogen sulphide
Carbondioxide
All of these
Methane

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

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

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Waste Water Engineering
The digested sludge from septic tanks, is removed after a maximum period of

3 years
3.5 years
4 years
5 years

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

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

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