Biofiltre
See also: Filter
A biofiltre is a means used for the water treatment polluted (biofiltration). It constitutes another technique of biological purification to fixed cultures. This method is generally used for the urban water treatment.
Purification of polluted water
Water to be treated undergoes a primary Décantation normally in a decanter-digester. Elutriated water then will cross the biofiltre. It consists of a granular solid mass (sand) of at least 70 cm like bacterial support with air insufflated by bottom. The granular material will play a part of filtration and the bacteria will degrade the pollution which water contains. Filter surface can be distributed on several beds in order to carry out rotations of food on the works because it is necessary to proceed to periods of rest of the filter solid masses in order to ensure D-oxygenation of it.This method can be used for purification plants of a capacity from 100 to 2000 Eq/Hab, it will function best from 200 to 1300 Eq/Hab.
Purification of water
The filter Chamberland is a means of filtering water pollée by infectious agents.Lors of an epidemic of typhoid fever in Paris, it conceives in 1884 its filter starting from a porous porcelain candle making it possible to filter the liquids and to retain for example the micro-organisms present in water.
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