SEWAGE PURIFYING APPARATUS

摘要

PURPOSE:To efficiently obtain purified water by arranging flat rotary plates and flat rotary membranes in a combined state within a bioreactor. CONSTITUTION:Sewage flows in a bioreactor 2 and receives aerobic aeration treatment by flat rotary plates 4 and aerated treated water is discharged. The microbial sludge layer adhered to the flat plate 4b of each flat rotary plate 4 is grown by aerobic aeration treatment to become thick but, since aeration treatment capacity is lowered by the reduction of an aeration surface area when said sludge layer becomes too thick, flat membranes 5b arranged in a superposed state so as to hold a predetermined gap P are brought into contact with the thickened microbial sludge layers under rotation to release said sludge layers. Therefore, a lowering of the aeration capacity of each flat rotary plate 4 can be prevented. Subsequently, the sewage is sucked and filtered by the filter membranes on the surface of the flat membranes 5b of flat rotary membranes 5 and the transmitted purified water passes through the pores of the main body of each flat membrane 5b to be sucked in a hollow rotary shaft 5a and is discharged to the outside of the bioreactor 2.