Aerobic biological wastewater treatment reactor in which the bacterial purifying biomass is placed on an inert support, forming a biofilm (fixed bed). Wastewater is uniformly distributed on the surface and flow downwards with the gravity, through the pores of the filter. Thus, bacteria can degrade the carbon pollution and a part of the nitrogen one. The natural air ventilation carries to the bacteria, all the oxygen they need to eliminate the pollution.
According to Seine-et-Marne Departemental Council
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