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Waste Water Engineering

Waste Water Engineering
The sewer which resists sulphide corrosion, is

Lead sewer
R.C. sewer
Brick sewer
Cast iron sewer

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Waste Water Engineering
In case of Imhoff tanks,

The shape is rectangular
The velocity of flow is restricted to 0.30 m/minute
Detention period is 2 hours
All of these

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.15 cumec
0.12 cumec
0.10 cumec
0.20 cumec

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Waste Water Engineering
The laying of sewers is done with

Clinometer
Theodolite
Magnetic compass
Level

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Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 – P1)/(100 + P2)] V1
[(100 + P1)/(100 – P2)] V1
[(100 – P1)/(100 – P2)] V1
[(100 + P2)/(100 – P1)] V1

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

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