METHOD FOR TREATING RESIST-CONTAINING WASTE LIQUID, AND CHEMICAL TO BE USED IN THE METHOD

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PROBLEM TO BE SOLVED : To provide a method for efficiently treating the resist-containing waste liquid discharged from a printed circuit board manufacturing factory, and a treating agent to be used for treating the resist-containing waste liquid. SOLUTION : Organic matter in the resist-containing waste liquid discharged from the printed circuit board manufacturing factory is precipitated/separated as a hardly soluble substance by adding a rare-earth element compound to the resist-containing waste liquid, adding an acid substance to rare-earth element compound-added liquid to adjust the pH to 0-4 and adding an alkaline substance to the acid substance-added liquid to adjust the pH to 6-12.