PROBLEM TO BE SOLVED: To provide a bactericidal/algicidal method comprising the addition of an oxidant-based bactericidal/algicidal agent and its stabilizer to a target water system to carry out a bactericidal/algicidal treatment and reducing the nitrogen content and COD level derived from the stabilizer by effectively utilizing the stabilizer and reducing the amount of the stabilizer.SOLUTION: The bactericidal/algicidal method comprises the addition of an oxidant-based bactericidal/algicidal agent and its stabilizer to a target water system, while controlling the addition amount of the oxidant-based bactericidal/algicidal agent in a manner to fall the total residual chlorine concentration of the water system within a prescribed range and controlling the addition amount of the stabilizer in a manner to fall the free residual chlorine concentration within a prescribed range.COPYRIGHT: (C)2009,JPO&INPIT【課題】対象水系に、酸化剤系殺菌殺藻剤とその安定化剤とを添加して、殺菌殺藻処理するに際し、上記安定化剤を有効活用し、その使用量を低減することにより、該安定化剤由来の窒素分及びCOD分を低減し得る殺菌殺藻方法を提供する。【解決手段】酸化剤系殺菌殺藻剤とその安定化剤とを、対象水系に添加して殺菌殺藻する方法であって、当該水系における全残留塩素濃度が所定の範囲内にあるように、前記酸化剤系殺菌殺藻剤の添加量を制御すると共に、遊離残留塩素濃度が所定範囲内にあるように、前記安定化剤の添加量を制御する。【選択図】なし
