| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for treating water containing fluorine and phosphorus capable of enhancing an effect by a sludge circulation method up to the most, further enhancing removal rates of fluorine and phosphorus contained and also effectively reducing loadings of an inorganic flocculent, and an apparatus therefor. SOLUTION: The method for treating the water containing fluorine and phosphorus is characterized by including a first process in which the water containing fluorine or/and phosphorus is acted by a calcium compound and made insoluble as calcium fluoride or/and calcium phosphate, a second process for adding sludge removed from a later stage and carried out regeneration treatment to the waste water from the first process to be mixed, a third process for adding an aluminum salt to the waste water from the second process to prepare an insoluble matter, a fourth process for separating the sludge containing the prepared insoluble matter to obtain treated water and discharge the sludge, and a fifth process for removing a part of the sludge, carrying out the regeneration treatment in which aluminum contained in the sludge is dissolved by adding an acid or an alkali and recirculating to the second process. COPYRIGHT: (C)2006,JPO&NCIPI
|
