| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for treating waste water containing fluorine and heavy metals capable of efficiently flocculating and precipitating heavy metals in a simple manner from the waste water and removing the heavy metals at a high degree. SOLUTION: Calcium chloride is dissolved in the waste water containing the heavy metals and thereafter a flocculant is added thereto and the pH of the liquid is adjusted to 4 to 7. The formed solids are then removed. At this time, the calcium chloride is preferably dissolved into the waste water containing the heavy metals at a concentration of 1 to 9g/100cc. Also, a silica-iron inorganic polymeric flocculant and a polymeric flocculant are preferably used in combination as the flocculant. COPYRIGHT: (C)2005,JPO&NCIPI
|
