A. 2.30 m
B. 2.40 m
C. 2.45 m
D. 2.50 m
Answer: Option C
This Question Belongs to Civil Engineering >> Waste Water Engineering
The effluent of a septic tank is
A. Fit for discharge into any open drain
B. Foul and contains dissolved and suspended solids
C. As good as that from a complete treatment
D. None of these
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
A. 1 in 5
B. 1 in 10
C. 1 in 15
D. 1 in 20
Drop manholes are the manholes
A. Without entry ladders
B. Without manhole covers
C. With depths more than 3.5 m
D. Having drains at different levels
Given
Height of cylindrical ejector,H=2m
Filling time,t=10min =600s
Peak sewage discharge,
Q=0.0157m^3/s
1. Volume of sewage collected
V=Qt
V=0.0157*600
V=9.42m^3
2. Volume of cylindrical chamber
V=3.14*d^2 *H/4
9.42=3.14*d^2*2/4
D^2=5.997
D=2.45m
So the diameter of the ejector chamber is approximately 2.45 m (2450 mm).