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Waste Water Engineering

Waste Water Engineering
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

Plateau
A heap
Windrow
None of these

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

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Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

80,000 to 100,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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

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

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

10 days
30 days
20 days
60 days

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Carbondioxide
Ammonia
Carbon monoxide
Methane

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