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Waste Water Engineering

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

First stage demand
Carbonaceous demand
Initial demand
All of these

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Waste Water Engineering
Aerobic bacterias

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

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Waste Water Engineering
The algae dies out in the zone of

Recovery
Degradation
Cleaner water
Active decomposition

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Waste Water Engineering
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

Kutter
Bazin
Crimp and Bruges
William-Hazen

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Waste Water Engineering
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

110 cm
120 cm
100 cm
150 cm

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Waste Water Engineering
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

1.15 D
1.75 D
1.5 D
1.25 D

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