The subject innovation is in the sewage treatment apparatus to prevent a performance degradation due to microbial death while installing the chemical treatment tank, and the volume of the biofilm filtering apparatus to a minimum can be easily applied to, small sewage treatment plant of by a small sewage treatment plant that is, of course, relates to a biofilm filtration system at a sewage treatment apparatus according to the microorganism in contact to prevent the filtration efficiency of the biofilm filtering device in accordance with increasing the anaerobic tank and the aerobic removal of the residual sludge-filled filter media tank efficiency is lowered When explaining the configuration as follows:; In the sewage treatment apparatus constructed twos flow adjustment tank, the chemical treatment vessel, the inclined plate settler, biofilm filtering device, and discharged, wherein the biofilm is a filtering device, the first and second branch pipe connected to the air line and the air supply is attached to one side of the other top in the hasuyi songgwan it is mounted a housing, a mixed solution turned portion which is formed on the first lower side of the housing, is positioned on top of the mixed solution turned portion through the first interface portion consisting of a plurality of first air distributor pipe and the first screen, an anaerobic tank and is separated from the mixture in part, being located on an upper part of the anaerobic pairs of second screen and a plurality of second aerobic tank and that is through a second interface portion consisting of the air distributor pipe separate anaerobic tank and, being positioned above said aerobic Article a third screen, and will be characterized by a part adapted supernatant taken out to be mounted on an upper peripheral edge the breathable sets.
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