| http://www.w3.org/ns/prov#value | - Specifically, the present invention is a method of processing an organic quaternary ammonium hydroxide-containing waste liquid where a waste liquid containing at least an organic quaternary ammonium hydroxide is brought into contact with a cation-exchanging material so as to remove the organic quaternary ammonium ions from the waste liquid due to adsorption of them to the cation-exchanging materia
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