| 摘要 |
PROBLEM TO BE SOLVED: To remarkably improve the removal and recovery rate of phosphorous from an organic waste water and sludge containing organic matter, phosphorous and nitrogen of a high concentration. SOLUTION: The treatment method having an MAP (Magnesium Ammonium Phosphate) separation stage where MAP generated in sludge in an anaerobic digestion stage is discharged to the outside of a system, is provided with: a sludge reduction stage to MAP-free sludge after the removal of the MAP particles dispersed into the sludge in the MAP separation stage; an MAP-Mg solution contact stage where a solution containing Mg ions is mixed into the MAP concentrated suspension separated in the MAP separation stage; an MAP particle recovery stage from the liquid containing the MAP concentrated suspension after the MAP-Mg solution contact stage; and a stage where the MAP-free suspension after the removal of the recovered solid MAP particles is returned to the anaerobic digestion stage or the prestage thereto. COPYRIGHT: (C)2004,JPO
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