TREATMENT METHOD FOR WASTE WATER INCLUDING FLUORINE

摘要

The removing processes of fluorine ions from the wastewater including fluorine in presence of CaF2 dissolving material comprise as the following steps : (a) the high concentration fluorine treatment step for making fluorine concentration in wastewater decrease to 20-25 ppm by adding slaked lime and sulfuric acid to be pH 5.8-8.3 ; (b) the low concentration fluorine treatment step for making fluorine concentration in the treated wastewater decrease to 15 ppm by adding slaked lime and alum to be pH 5.8-8.3 : (c) the coagulation elimination step for removing the coagulated solids precipitated by adding a flocculant such as polyacryamide.