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WASTE WATER ENGINEERING

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

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

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Waste Water Engineering
1000 kg of sewage contains

0.112 kg in solution
0.225 kg in solution
0.112 kg in suspension
Both A and C of above

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Waste Water Engineering
Water content of sewage is about

0.95
0.99
0.999
0.9

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Waste Water Engineering
A circular sewer section is preferred to because

It provides maximum area for a given perimeter
It is cheaper in construction
All listed here
It provides maximum hydraulic mean depth

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Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43894
43832
43833
43834

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