Method for treating wastewater including fluorine

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PURPOSE : A method for treating wastewater containing fluorine ions is provided to remove fluorine from fluorine ions contained in wastewater selectively to a low concentration range irrespective of the initial concentration, and minimize the concentration of residual chlorine ions of treated water. CONSTITUTION : A method for treating wastewater containing fluorine ions comprises the steps of : flowing fluorine ion-containing wastewater collected in a catchment tank into a first reaction tank, and injecting a lanthanium carbonate-reacting aqueous sulfuric acid solution into the wastewater; flowing the wastewater having the lanthanium carbonate-reacting aqueous sulfuric acid solution injected thereinto into a second reaction tank, and injecting an alkaline solution into the wastewater to adjust a pH of the wastewater to at least 5; flowing the wastewater of which a pH has been adjusted to the at least 5 into a third reaction tank, and injecting an aqueous sodium polymetaphosphate solution or a rare earth compound into the wastewater until the wastewater has a pH of 8 to 9; and injecting a polymer flocculant into the wastewater when a pH of the wastewater is adjusted to a range of 4 to 9. Further, the alkaline solution is sodium hydroxide, and the rare earth compound is one of Ce, La or a mixture thereof. © KIPO 2008