Waste water treatment method of removing fluorine and cyanides using rare metal

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According to the present invention, a waste water treatment method containing fluorine ions and cyanides is provided, in which the removal of fluoride is carried out by adding a first metal salt aqueous solution containing metal ions having an average oxidation number of +3 to +4 to the wastewater and adjusting the acidity to pH 1 to 5 so that a rare metal compound binds with the fluorine ions to form a precipitate, and the removal of the cyanide is carried out by adding a second metal salt aqueous solution containing metal ions having an average oxidation number of +1 to +3 to the wastewater and adjusting the acidity to pH 1 to 3 so that the transition metal compound binds with cyanide to form a precipitate.(S100) Step of removing fluorine ions(S110) Step of adding an iron compound(S120) Step of adding aluminum and iron compound(S200) Step of removing cyanide ions(S300) Step of adding a polymer flocculantCOPYRIGHT KIPO 2018