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Waste Water Engineering

Waste Water Engineering
Chlorination of water is done for the removal of

Sediments
Bacterias
Hardness
Suspended solids

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

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

All listed here
Oxidation
Screening
Sedimentation

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Waste Water Engineering
The average temperature of sewage in India, is

15°C
20°C
10°C
25°C

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Waste Water Engineering
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1 in 5
1 in 10
1 in 20
1 in 15

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

100 mg/l
50 mg/l
150 mg/l
250 mg/l

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