Septic tanks are used for the collection and partial treatment of household waste waters. There are three types of septic tanks available:-non-backflowing septic tanks for dry toilets,-non-backflowing septic tanks for household waste waters,-backflowing septic tanks for household waste waters.Septic tanks may be used for a maximum of 50 persons. The drainage of effluent from backflowing septic tanks into surface waters is not allowed but it can be directed into the underground system provided that this does not endanger the water sources. Septic tanks may be used as a temporary solution for the drainage of waste waters where the construction of the sewage system is envisaged.
A non-backflowing septic tank is a double compartment container, in which waste waters are collected. The volume of a septic tank for dry WC cubicles must be 500 litres/person and for household waste waters, 3000 litres/person. A backflowing septic tank must have a volume of 2000 litres/person. A backflowing septic tank for 10 persons must have two compartments while for over 10 persons, it must have three compartments. In the backflowing septic tank, waste waters are partially treated and are drained into the underground water (if this does not endanger the water sources). Anaerobic biological decomposition occurs in the septic tanks which however, is not final.The outflow from the septic tank with three compartments is cleaner and smells less. The septic tank must be emptied at least once a year.
A septic tank is a dug in container. It must be installed in an accessible place which enables maintenance and emptying. It can be installed on a non-trafficked or trafficked surface.
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