SEPTIC TANK
SEPTIC TANK AND ITS SIZE
INTRODUCTION:
A septic tank is a watertight chamber made of concrete, fiberglass, PVC or plastic, through which domestic wastewater (sewage) flows for primary treatment. Settling and anaerobic processes reduce solids and organics.
PARTS OF SEPTIC TANK:
INTRODUCTION:
A septic tank is a watertight chamber made of concrete, fiberglass, PVC or plastic, through which domestic wastewater (sewage) flows for primary treatment. Settling and anaerobic processes reduce solids and organics.
PARTS OF SEPTIC TANK:
SEWAGE: Dirty
water which comes out from inlet.
SLUDGE: Sludge which comes from inlet and stay inside
DETENTION
TIME: Time taken to digest the sludge.the detension time
varies from 12 hrs to 24 hrs.
TOP
SEWAGE LINE: Top swage line stay above 300 mm from ground level.
INLET:
Through inlet sewage and solid particles comes in the
septic tank.
OUTLET:
Digested sludge went to drain through outlet.
SIZE OF SEPTIC TANK:
Lests assume number of users: 6
Cleaning period:3 years
One person produces 30 lit sludge/year
Total sludge:6x30x3
=540 lit
One person produces sewage 50 lit/day
Total sewage:6x50
=300 lit
Total volume: 540+300
=840 lit
But we know that standard volume of septic tank is 1400 lit for being
successful.
Capasity of tank=1400 lit
Depth:1.5m
Surfacearea=1.4/1.5
=~ 1 square meter( value less than required standard
=~ 1 square meter( value less than required standard
for 6 persons
size:
width: 900 mm
length: 3x900=2700 mm
height: 1.5 m + free board 300 mm=1800 mm
volume:900x2700x1800 cubic mm.
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