PROBLEM TO BE SOLVED: To efficiently treat a high polymer absorbent of a used sanitary article containing a pulp fiber and the high polymer absorbent, and to efficiently recover the pulp fiber from the used sanitary article.SOLUTION: A method for treating a high polymer absorbent includes: a process in which the high polymer absorbent is dissolved with ozone water, is decomposed into low molecules, and is solubilized； and a process in which the high polymer absorbent is solved in ozon water, and the high polymer absorbent is discharged together with ozon water. A method for recovering a pulp fiber includes: a process in which the high polymer absorbent is dissolved with ozone water, is decomposed into low molecules, and is solubilized； a process in which the high polymer absorbent is solved in ozon water, and the high polymer absorbent is discharged together with ozon water； and a process in which the pulp fiber as a residue of a sanitary article is recovered.SELECTED DRAWING: None【課題】パルプ繊維および高分子吸収材を含む使用済み衛生用品の高分子吸水材を効率的に処理する。また、使用済み衛生用品からパルプ繊維を効率的に回収する。【解決手段】本発明の高分子吸水材を処理する方法は、高分子吸水材をオゾン水で分解し低分子量化し、可溶化する工程、および高分子吸水材がオゾン水に溶け、オゾン水とともに高分子吸水材を排出する工程を含む。本発明のパルプ繊維を回収する方法は、高分子吸水材をオゾン水で分解し低分子量化し、可溶化する工程、および高分子吸水材がオゾン水に溶け、オゾン水とともに高分子吸水材を排出する工程、および衛生用品の残渣であるパルプ繊維を回収する工程を含む。【選択図】なし
