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Waste Water Engineering

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

Kidneys
Thyroid
Eyes
Ovaries/testis

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

Depth of 0.9 m to 1.20 m is kept
Flow velocity 0.15 m to 0.3 m/sec is kept
All of these
One minute of detention period is kept

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

Initial demand
First stage demand
All of these
Carbonaceous demand

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

None of these
Acid fermentation
Acid regression
Alkaline fermentation

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Adding sulphuric acid
Boiling
Adding potassium permanganate
Phenol-di-sulphuric acid

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Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

4 ppm
10 ppm
3 ppm
5 ppm

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