Patent ID: 7427354

Claim:
A system for the degradation treatment of organics in organically-polluted water, said system being provided with a treatment tank for receiving, as said organically-polluted water, sewage or wastewater, to subject said organics in said organically-polluted water to degradation treatment in said treatment tank, wherein said treatment tank comprises: an inlet for introducing said organically-polluted water into said treatment tank, an outlet for discharging treated water from said treatment tank, a purification zone arranged between said inlet and said outlet to purify said organically-polluted water while allowing said organically-polluted water to flow there through, and a plurality of perforated walls, each of the perforated walls having at least one plate, each of the perforated walls including a plurality of through-holes formed therein, and arranged with intervals there between in said purification zone to divide said purification zone into plural cells, wherein the plurality of through-holes form openings across 5%-40% of a surface of each perforated wall; said perforated walls are arranged across said flow of said organically-polluted water such that aerobic cells, into which oxygen-containing gas is fed to effect degradation of soluble organics in said organically-polluted water primarily with aerobic bacteria, and anaerobic cells including a pit region formed below a plane that intersects a bottom-most surface of the aerobic cells that the pit region is disposed below the adjacent aerobic cells, in which degradation of solid organics in said organically-polluted water is effected primarily with anaerobic bacteria without feeding oxygen-containing gas, are located adjacent to each other in combinations with said perforated walls interposed there between, respectively, and upon operation of said system, transition zones in which degradation of said organics in said organically-polluted water is effected primarily with facultive bacteria are formed in vicinities of said perforated walls, respectively; and said inlet and said outlet are in communication with a most upstream one and a most downstream one of said aerobic cells, respectively.