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Waste Water Engineering

Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

500 cm/sec
313.5 cm/sec
413.5 cm/sec
213.5 cm/sec

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Waste Water Engineering
The intensity of rain is expressed in

cm/day
cm/hour
cm/minute
None of these

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Waste Water Engineering
In sewers designed with self cleansing velocity,

Neither silting nor scouring occurs at the bottom
The bottom is scoured
The bottom is silted
Both silting and scouring occur at the bottom

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Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

0°C
20°C
25°C
15°C

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 3H3p/2 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 2H3p/3 Z5

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Waste Water Engineering
In detritus tanks,

Organic and inorganic materials are separated
Detention period is kept 3 to 4 minutes
All listed here
Flow velocity is kept 0.09 m/sec

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