METHOD FOR TREATING FLUORINE-CONTAINING WASTE WATER

摘要

PROBLEM TO BE SOLVED: To provide a method for treating fluorine-containing waste water capable of removing fluorine contained in the waste water while suppressing production of a dehydrated cake as waste. SOLUTION: In the treating method in which the waste water discharged from a desulfurization equipment is pH-adjusted in a pH adjustment tank and fluorine contained in the waste water is adsorbed on a precipitable compound in a reaction vessel and removed by coagulation sedimentation, a part of the fluorine is drawn from the system by adding calcium hydroxide in a stage subsequent to the pH adjustment tank and sodium hydroxide is added to the reaction vessel so that a slurry containing basic magnesium sulfate on which the remaining fluorine has been adsorbed is dehydrated and drawn as a dehydrated slurry from the system.