| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for certainly recovering phosphorus with high efficiency by efficiently discharging phosphorus contained in the excess sludge formed from a biological dephosphorization process. SOLUTION: In a biological dephosphorization process having an anaerobic tank and an aerobic tank, produced excess sludge is recovered as a slurry and, after the recovered phosphate type phosphorus (PO<SB>4</SB>-P) is discharged into slurry water, the slurry after discharge is concentrated to be separated into active sludge and phosphorus concentrated water and the phosphorus concentrated water after separation is charged in a fluidized bed filled with steel sludge to crystallize phosphorus component as calcium appatite to be recovered. COPYRIGHT: (C)2008,JPO&INPIT
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