DESIGN OF SEPTIC TANK
DESIGN
OF SEPTIC TANK
No.
of people=75
Sewage
/capital/day=120liters
De-
sludging period=1 year
Length
: width=4:1
Assume
the detention period=24 hrs
Free
board =300mm
Quantity
of sewage produced per day=9000 liters/day
Quantity
of sewage produced per day=9000 liters/day
Capacity
of the tank=9000*24/24
=9000liters
Assuming
the rate of sludge deposit =30liters/capita/day
The
quantity of sludge deposited
=30*75*1
=2250liters
Total
required capacity of the tank
=9000 /750
=12 m3
Assuming
the depth of tank =1.5m
Area
of tank =12/1.5
=8m2
4B2=8
B=1.4m
L=4*1.4
=5.6m
The
dimensions of the tank will be =5.6m*1.5*(1.5+0.3)
=5.6m*1.5m*1.8m
DESIGN OF SOAK PIT:
Sewage
flow=9000 L/d
Percolation
rate=1250 L/m3/d
Volume
required for the soak pit=9000/1250
=7.2m3
Assume
the depth of soak pit =2m
Area
of soak pit required =7.2/2
=3.6m2
Diameter
of soak pit =√(3.6*4/Ï€)
=2.14m
About Author:
I am Thomas Britto here to share my experiences in the civil engineering field to all my readers.Today many students are struggling to buy books at high prices. So I decided to start a blog and share my experience and knowledge with all my readers.
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