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Design of Septic tank

What is the size of my septic tank

Functioning of a septic tank
The size of septic tank depends on number of users and interval of sludge removal.The liquid capacity of tank is taken as 130 liters to 70 liters per head.

Parts of a Septic Tank.

Watertight tank,In let pipe, Baffle wall,Outlet pipe, Gas ventilation, Man hole, Bottom  floor slope etc are the elements to consider while constructing  a septictank.

Size of the tank

As per IS 2470 Septic tank shall have

minimum width of 75cm,

minimum depth of 1 metre below water level

minimum liquid capacity of 1 000 litres ( 1 m3).

For rectangular septic tanks, the length of the tank shall be 2 to 4 times the width.

For circular tanks the minimum diameter shall not be less than l-35 m and operating depth shall not be less than 1-O m.

Baffle Walls of Septic Tank

Septic tanks are split into two chambers. The chambers are divided by a baffle wall. Solids are retained in the first chamber, and liquids then pass through the baffle into the second chamber and on to the percolation areaBaffle walls are provided near the inlet. Baffle wall is placed at a distance of L/5 from the  in let wall, where L is the length of the wall. The baffle wall is generally extended 150mm above to scum level and 400-700mm below it. Thickness of the wall varies from 50mm to 100mm. for large tanks lower portion are having holes for flow of sludge.

the floor of septic tank is given a slope of 1:10 to 1:20 towards the inlet side. ie the floor of the outlet side will be on the higher elevation than the floor at inlet side.
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Some technical words to understand

Detention Time. The theoretical (calculated) time required for a given amount of water or wastewater to pass through a tank at a given rate of flow. The time required to fill a tank at a given flow
Conversion of litter to gallon: 1litter=.264 US gallon ; I gallon =3.78 litter
Anaerobic digestion : is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen.
Effluent sewer systems, is that collect sewage from residences and businesses places, and the effluent that comes out of the tank is sent to either a centralized sewage treatment plant or a distributed treatment system for further treatment or to leach pit.
Scum: a layer of dirt or froth on the surface of a liquid.
Read more from SEPTIC MATTERS
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Functioning of a septic tank

 

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