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Waste Water Engineering

Waste Water Engineering
In sewage having fully oxidised organic matter, the nitrogen exists in the form of

Aluminoid nitrogen
Nitrates
Free ammonia
Nitrites

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Waste Water Engineering
Primary treatment of sewage consists of removal of

Floating materials
Oil and grease
Sand and girt
Large suspended organic solids

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Waste Water Engineering
Antisyphonage pipe is fitted

On manholes
At the beginning of sewer line
With a W.'trap
At the end of septic tanks

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.84 D
D’ = 0.74 D
D’ = 0.64 D
D’ = 0.94 D

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Waste Water Engineering
Which one of the following part of human body withstands minimum radiation?

Thyroid
Kidneys
Ovaries/testis
Eyes

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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

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

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