Septic Tank, It’s Principle and Guidelines

 

Septic tanks or soak pits are useful for disposal of waste in the areas or houses where public sewerage system is not applicable.

Public sewerage system is not laid at some places or in houses located in isolated areas which can not be connected with public sewer system economically. In this situation the waste of the house can be disposed off through individual disposal system such as septic tank or soak pit etc. Septic tank has limitations and will provide unsatisfactory quality of the effluent and also faces difficulty for providing proper disposal system of the effluent. The septic tank is recommended for small communities where population does not exceed 300. 

Working Principle        

Sewage and waste of the house come into septic tank and solid matters settle down at the bottom of the tank. Anaerobic Bacteria convert the sewage into liquid and gases during the process of digestion. In this way there is appreciable reduction in the volume of waste and it changes into semi solid condition, which is called sludge. It is necessary that septic tank is covered with water tight top roof slab. Septic tanks are generally constructed in brick masonry.
       
Guidelines for Septic Tank

  1. Sufficient water is required for proper functioning of septic tank.
  2. The waste containing detergent should be avoided in septic tank as it had adverse effect on anaerobic bacteria.
  3. Septic tank should have minimum width of 0.75 meter and minimum depth of 1 meter below water level of the septic tank.
  4. Length of the tank should be 2 to 4 times the width.
  5. Every septic tank should be provided with ventilation pipe of at least 50 mm diameter.
  6. Minimum free board above water level should be of 30 cm.
  7. The floor of the tank should be of cement concrete 1:1.5:3 and has a minimum slope 1 in 10 provided towards the sludge outlet to facilitate de-sludging. 
  8. The inner surface of septic tank should be plastered with rich cement.
  9. For efficient working of septic tank the sludge should be cleaned half yearly or yearly.

 

 
8  Comment(s)
Selvakumar
By Selvakumar -  On  5/27/2015 4:05:37 PM
We are constructing a new house in Madurai. Our contractor says that we can leave a partial portion of the the base of the septic tank without cement flooring so that the water will get absorbed into the soil and we can have the tank cleaned once in 2 - 3 years.

Is the method of leaving the base of a septic tank without cement flooring advisable? Won’t it affect the soil and gradually won’t the contaminated water get mixed with the bore well, which is just about 15 feet away from the septic tank.

Kindly advice.
 
Sailendra Kr Prasad
By Sailendra Kr Prasad -  On  1/19/2015 9:27:36 PM
can i make Septic tank and soak pit in south side.
 
Anonymous
By Anonymous - On 6/16/2014 6:07:30 PM
What should be ideal distance between drain/leech field of a septic tank from water source example: ponds, well.
 
Anonymous
By Anonymous - On 2/18/2014 10:29:58 PM
Soak Pit is required in addition to septic tank as it helps in percolation of overflow/excess of effluent from septic tank to the soil and sludge will be deposited in the septic tank. As such it helps in efficient working of septic tank and prevents overflow/early filling of septic tank and thereby reduce the frequency of disposal of sewage from the septic tank.
 
Mohammad Abdul Ahad
By Mohammad Abdul Ahad -  On  9/22/2013 7:57:08 PM
Very informative
 
Mansingrao
By Mansingrao -  On  5/11/2011 5:31:39 PM
USEFULINFORMATION. THANKS..
 
Anonymous
By Anonymous - On 12/21/2010 5:32:12 PM
my house septic tank is in south east corner. Is it good?
 
satish singh
By satish singh -  On  8/29/2010 9:14:46 PM
why soak pit is required in addition to septic tank?
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