| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic wastewater treatment apparatus which achieves a higher reduction of surplus sludge. SOLUTION: The organic wastewater treatment apparatus comprises an aeration tank which passes organic wastewater to bring the wastewater in contact with floating microbial sludge to biologically treating the wastewater; a submerged filter bed tank which has a packed bed consisting of a filler the surface of which has deposits of activated sludge and passes the treated water of the aeration tank through the packed bed to biologically treat it, a sludge separator which separates sludge from the treated water of the submerged filter bed tank and from back washing water generated when a submerged filter bed is back washed, a sludge solubilization device which solubilizes the sludge separated by the sludge separator; and a means for returning sludge-solubilized liquid after the solubilization treatment to the aeration tank. The organic wastewater treatment apparatus comprises the aeration tank which passes the organic wastewater to bring the wastewater in contact with the floating microbial sludge to biologically treat the wastewater, a fluidized bed tank which contains the filler the surface of which has deposits of the activated sludge and passes the treated water of the aeration tank to aerate the treated water together with the filling material while mixing them, the sludge separator which separates sludge from the treated water of the fluidized bed tank, the sludge solubilization device which solubilizes the sludge separated by the sludge separator, and the means for returning the sludge-solubilized liquid after the solubilization treatment to the aeration tank. COPYRIGHT: (C)2005,JPO&NCIPI
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