| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for removing phosphorus in an activated sludge treatment which removes organic materials and phosphorus and can minimize the amount of generated sludge only by drawing the minimum sludge as an excess sludge in the treatment of an organic polluted water by a flocculant- adding activated sludge method in combination with the solubilizing of the sludge. SOLUTION: In the method for removing phosphorus in the activated sludge treatment biologically treating the organic polluted water by the activated sludge in a reactor 2, after phosphorus is insolubilized by adding an flocculant to a polluted water A the sludge is solubilized and phosphorus is eluted, and also the solubilized sludge is solid-liquid separated by adding an acid to a sludge C generated from the reactor 2, and phosphorus is separated and discharged by insolubilizing phosphorus again by adding an alkaline agent to a separated solution E to solid-liquid separate the insolubilized phosphorus in the separated solution.</p> |
