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Waste Water Engineering

Waste Water Engineering
In sewers the gas generally found, is

Methane (CH4)
Carbon dioxide (CO2)
Hydrogen sulphide (H2S)
All listed here

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Waste Water Engineering
Dried sewage after treatment is used as

Fertilizer
Chemical for lowering B.O.D.
Building material
Base material for paints

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Waste Water Engineering
Kjeldahl nitrogen is a mixture of

Nitrogen and organic nitrogen
Organic nitrogen and ammonia
All listed here
Ammonia and nitrogen

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

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Waste Water Engineering
A manhole is classified as shallow if its depth is between

0.5 to 0.7 m
0.4 to 0.5 m
0.7 to 0.9 m
0.9 to 1.20 m

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Waste Water Engineering
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

0.35 m/sec
0.40 m/sec
0.30 m/sec
0.45 m/sec

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