消毒装置对家用反渗透纯水机出水的消毒效果

Disinfection for Pure Water Produced by Household RO Purifier

目的探讨加装消毒装置对家用反渗透纯水机出水的消毒效果。方法分别采用紫外线消毒器和臭氧消毒器代替某品牌反渗透纯水机的活性炭过滤器,观察加装消毒装置前后纯水机制备的纯净水在储水罐内储存2h～14d出水中细菌总数的变化,以及出水静置0～24h细菌总数的变化,并按照CJ94-1999《饮用净水水质标准》(<50cfu/ml)进行评价。结果装备活性炭过滤器的反渗透纯水机制备的纯净水在储水罐中储存超过6h,出水中细菌总数超标,并且菌落总数随着储存时间的延长而增加。采用紫外线消毒器或者臭氧杀菌器后,纯水机制备的纯净水在储水罐中储存14d,出水中细菌总数均达标;出水在室温下保存不超过8h,水中的细菌总数小于15cfu/ml;静置16h时,细菌总数超标;静置6h以内,臭氧的消毒效果略好于紫外线;静置6h以后,紫外线的消毒效果略好于臭氧。结论建议反渗透纯水机加装紫外线消毒器,经紫外线消毒的出水应在16h内饮用。

Objective To study the relationship between static duration and bacteria reproduction of pure water from the RO purifier. Methods The original structure of RO purifier was modified by installing additional UV lights and ozone disinfector respectively. Bacteria reproduction in the effluent from RO purifier and modified RO purifier was detected after different static duration. Results The total count of bacteria in the fresh pure water was 20 cfu/ml which was up to the standard of pure drinking water CJ 94-1999. However the total count of bacteria in the pure water will be more than 50 cfu/ml after the pure water was stored inside the tank for six hours, which was not up to the standard of CJ 94-1999. Both ultraviolet rays and ozone could prolong the static duration of pure water, and the efficacy of ultraviolet rays was better than ozone. Conclusion UV light should be installed in RO purifier, the disinfected pure water by UV should be used in 16 hours after disinfection.