PROBLEM TO BE SOLVED: To provide a treatment method for open circulating cooling water system which is capable of unfailingly sterilizing and suppressing Legionella to a non-detection level, and hardly proliferate algae having drug resistant bacteria and drug resistance.SOLUTION: The treatment method includes treatments to cooling water of the open circulating cooling water system by: a halogen oxide for one hour or more within 24 hours and an organic sterilizing agent at least once within 30 days.COPYRIGHT: (C)2012,JPO&INPIT【課題】レジオネラ属を確実に不検出レベルに殺菌、抑制することができ、しかも薬剤耐性菌や薬剤耐性を持った藻類が繁殖しにくい開放循環冷却水系の処理方法を提供する。【解決手段】開放循環冷却水系の冷却水に対して、ハロゲン系酸化物による処理を24時間に1時間以上行い、かつ、有機系殺菌剤による処理を30日間に1回以上行う。【選択図】なし
