PROBLEM TO BE SOLVED: To recover efficiently highly-safe pulp fibers free from performance degradation of the pulp fibers, from a used absorbent article containing pulp fibers and a highly absorbent polymer such as a paper diaper.SOLUTION: A method includes steps for: taking out a mixture of pulp fibers, a highly absorbent polymer and water from a used absorbent article； inactivating the highly absorbent polymer by applying a voltage by using a pair of electrodes to the mixture of pulp fibers, the highly absorbent polymer and water； and separating pulp fibers from the mixture of pulp fibers, the inactivated highly absorbent polymer and water.SELECTED DRAWING: Figure 1【課題】紙おむつ等のパルプ繊維および高吸水性ポリマーを含む使用済み吸収性物品から、パルプ繊維の性能劣化がなく、安全性の高いパルプ繊維を効率的に回収する。【解決手段】本発明の方法は、使用済み吸収性物品からパルプ繊維と高吸水性ポリマーと水の混合物を取り出す工程、パルプ繊維と高吸水性ポリマーと水の混合物に、一対の電極を用いて電圧を印加して、高吸水性ポリマーを不活化する工程、およびパルプ繊維と不活化した高吸水性ポリマーと水の混合物からパルプ繊維を分離する工程を含む。【選択図】図１
