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Waste Water Engineering

Waste Water Engineering
Are available in size Stoneware sewers

All of these
15 cm
20 cm
10 cm

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Waste Water Engineering
Fresh sewage is generally

Acidic
Alkaline
A source of objectionable odour
Highly decomposed

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Waste Water Engineering
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

0.1
0.5
0.05
0.25

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

300 mg/l
100 mg/l
400 mg/l
200 mg/l

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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 20
1 in 10
1 in 15

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5

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