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Waste Water Engineering

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 15
1 in 20

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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

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

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Waste Water Engineering
Kjeldahl nitrogen is a mixture of

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

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

15 cm
18 cm
12 cm
10 cm

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Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

60 days
30 days
15 days
90 days

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Waste Water Engineering
The sewage treatment in septic tanks is due to

Aerobic decomposition
Anaerobic decomposition
Parasitic decomposition
None of these

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