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Waste Water Engineering

Waste Water Engineering
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1 in 15
1 in 10
1 in 20
1 in 5

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Waste Water Engineering
Hume steel pipes are

Both B and C
Steel shell coated from outside with cement mortar
Steel pipes
Steel shell coated from inside with cement mortar

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05554 cumec
0.05552 cumec
0.05556 cumec
0.0556 cumec

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

15 cm
12 cm
10 cm
18 cm

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Waste Water Engineering
The laying of sewers is done with

Theodolite
Magnetic compass
Clinometer
Level

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

Carbonaceous demand
First stage demand
All of these
Initial demand

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