臭氧协同过氧乙酸消毒在医院集中式纯水供应系统中的应用研究

Application of ozone combined with peracetic acid disinfection in centra-lized pure water supply system in hospitals

目的探讨臭氧协同过氧乙酸(PAA)消毒法降低集中式纯水供应系统使用点末端纯水中需氧菌总数的效果。方法开展两阶段对照研究,对某医院集中式纯水供应系统的末端纯水进行微生物限度检查。第一阶段使用PAA消毒法,第二阶段为臭氧强化消毒阶段,使用PAA协同臭氧的消毒方式。比较不同阶段的消毒效果。结果试验期间共采集211份水标本,PAA消毒组101份,臭氧强化消毒组110份,用水点末端纯水菌落合格率臭氧强化消毒组(85.45%)高于PAA消毒组(74.26%),差异有统计学意义(P=0.04)。臭氧强化消毒组的需氧菌菌落数的中位数(2 CFU/mL)低于PAA消毒组(20 CFU/mL)。随着消毒后时间延长,PAA消毒组的水标本中需氧菌数量呈现明显的上升趋势(第1天VS第92天:9 CFU/mL VS 1062 CFU/mL),臭氧强化消毒组纯水需氧菌数量则波动较小(第1天VS第92天:8 CFU/mL VS 58 CFU/mL)。结论臭氧协同PAA消毒法可降低集中式纯水供应系统的末端出水的需氧菌总数,且维持效果明显。

Objective To explore the disinfection effect of ozone combined with peracetic acid(PAA)on reducing the total number of aerobic bacteria in pure water from the terminal of centralized pure water supply system.Methods A two-stage controlled study was conducted,and microbial limit test was performed on the pure water from the terminal of centralized pure water supply system in a hospital.At the first stage,PAA disinfection method was adop-ted,and ozone enhanced disinfection(PAA combined with ozone disinfection)was adopted at the second stage.Disinfection effects at different stages were compared.Results A total of 211 water specimens were collected for testing,including 101 specimens from PAA disinfection group and 110 from ozone enhanced disinfection group.The bacterial colony qualification rate of terminal pure water from the ozone enhanced disinfection group was higher than PAA group(85.45%vs 74.26%,P=0.04).The median of aerobic bacterial colony number of the ozone enhanced disinfection group(2 CFU/mL)was significantly lower than that of the PAA disinfection group(20 CFU/mL).With time increase after disinfection,the number of aerobic bacteria colony in water specimens from the PAA disinfection group showed a significant upward trend(Day 1 vs Day 92:9 CFU/mL vs 1062 CFU/mL),while the aerobic bacteria fluctuation range in the pure water from the ozone enhanced disinfection group was relatively small(Day 1 vs Day 92:8 CFU/mL vs 58 CFU/mL).Conclusion The ozone combined with PAA disinfection method can significantly reduce the total number of aerobic bacteria in water from the terminal of centralized pure water supply system,with obvious maintaining effect.