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Septic Tank

Septic Tank 

In normal areas and in the case of isolated buildings and institutions, hotels, hospitals schools, and small residential colonies, an underground sewerage system with provision for complete treatment of sewage may be neither feasible nor economical even though water supply facilities exist. In such cases, septic tanks and subsurface disposal of effluent are provided.

Septic Tank Is



The septic tank should be located as far as possible away from buildings. It should not be located in swampy areas or areas prone to flooding. Where there are 15 clayey or nonporous soil or where houses are closely built suitably designed loading pits may have to be used a septic tank cannot be avoided. Where the soil IS heavily porous the septic tank is effective.

The septic tank 15 is a water-tight, single-storeyed, underground tank 111 in which sewage is retained for a long period. Here sedimentation and sludge digestion take place simultaneously. The Septic tank is generally rectangular in shape with R.C.C. roofing.

 Usually, it has two chambers separated by a baffle wall. Sewage enters the front chamber known as the grit or screen chamber. The other is the anaerobic chamber. The Septic tank should be properly ventilated with the provision of air vent pipes. A manhole is provided in the roof for inspection and cleaning: Sludge accumulated at the bottom of the Septic tank is removed at intervals either by manual labour or by pumping.


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