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Waste Water Engineering

Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

Dysentery
All listed here
Cholera
Typhoid

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Waste Water Engineering
Aerobic bacterias

Flourish in the presence of free oxygen
All of these
Oxidise organic matter in sewage
Consume organic matter as their food

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

10% more
10% less
20% more
20% less

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

100 ppm
50 ppm
150 ppm
200 ppm

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Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

150 mm dia
All of these
100 mm dia
225 mm dia

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Waste Water Engineering
Discrete or granular particles change their

Shape
None of these
Weight
Size

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