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Waste Water Engineering

Waste Water Engineering
Removal of oil and grease from sewage, is known

Skimming
None of these
Filtration
Screening

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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

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

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Waste Water Engineering
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

Citric acid
Hydrochloric acid
Sulphuric acid
Nitric acid

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 120
1 in 100
None of these
1 in 60

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Waste Water Engineering
For house drainage minimum gradient is

1 in 10
1 in 80
1 in 60
1 in 400

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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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