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目的观察3种消毒方法对空调循环冷却水中嗜肺军团杆菌的消毒效果。方法通过模拟现场消毒试验和现场消毒试验方法,对三种消毒方法杀灭嗜肺军团杆菌的效果进行了观察。结果在模拟现场条件下,用30mg/L的二氧化氯作用45 min,对冷却塔水中嗜肺军团杆菌的杀灭率达99.98%;紫外线/镍网/二氧化钛光催化反应器运行90 min,对该细菌杀灭率达99.99%;0.4 mg/L铜离子与0.04 mg/L银离子以及0.3 mg/L有效氯协同作用45 min,对该细菌杀灭率为99.99%。在现场处理条件下,用上述3种方法分别处理12～48 h,空调冷却水中未检出嗜肺军团杆菌;在间隔2周后,冷却塔水中重新检出嗜肺军团杆菌。结论上述3种消毒方法在模拟现场和现场消毒试验中,均可在不同时间内有效杀灭冷却塔水中嗜肺军团杆菌。
Objective To observe the disinfection effect of three disinfection methods on Legionella pneumophila in air conditioning circulating cooling water. Methods The effects of three sterilization methods on killing Legionella pneumophila were observed by simulating field disinfection test and field disinfection test. Results Under simulated field conditions, the killing rate of Legionella pneumophila in the cooling tower was 99.98% with the effect of 30mg / L chlorine dioxide for 45 min. The UV / Ni / TiO2 photocatalytic reactor was operated for 90 min, The killing rate of this bacterium reached 99.99%. The synergistic effect of 0.4 mg / L copper ion with 0.04 mg / L silver ion and 0.3 mg / L available chlorine for 45 min resulted in the killing rate of 99.99%. Under the condition of field treatment, the Legionella pneumophila bacteria were not detected in the air-conditioning cooling water for 12 ~ 48 h with the above three methods, respectively; and after a lapse of 2 weeks, the Legionella pneumophila re-detected in the cooling tower water. Conclusion The above three kinds of disinfection methods can effectively kill Legionella pneumophila in cooling tower at different times in the simulated field and on-site disinfection.