SEPTIC TANK TREATMENT PROCESS

A Septic Tank is a waterproof tank usually located below ground level. Septic Tanks provide preliminary treatment for the entire wastewater stream by allowing solids to settle to the base of the tank, and oils and fats to float to the top to form a scum layer. Anaerobic (in the absence of oxygen) bacterial digestion of the stored solids produces sludge, which accumulates in the bottom of the tank. Partly treated odorous effluent flows from the Septic Tank to either further on-site treatment or directly to one or more ETA Beds.

The settled and digested solids undergo slight compaction and Anaerobic decomposition, they need to be removed periodically to prevent clogging of the tank and the carry over of solids with the treated wastewater (these can clog and shorten the life of any of the components of the treatment system).

Desludging should be done every three years, but the frequency depends on how heavily the system is used and the design of the tank.

Septic Tanks do not remove nutrient. The wastewater is not disinfected, and because it is highly infectious it must be applied to land below ground level.

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