Szabo Jeffrey, Rodgers Mark, Mistry Jatin, Steenbock Joshua, Hall John
US Environmental Protection Agency, National Homeland Security Research Center, 26 W. Martin Luther King Dr. (MS NG-16), Cincinnati, OH 45268, USA.
US Environmental Protection Agency, National Risk Management Research Laboratory, 26 W. Martin Luther King Dr. (MS NG-16), Cincinnati, OH 45268, USA.
Water Sci Technol Water Supply. 2019 Aug 1;19(5):1339-1346. doi: 10.2166/ws.2018.195. Epub 2018 Dec 24.
A full-scale reproduction of an aircraft drinking water system was conditioned using municipal tap water with a mixture of free chlorine and chloramines, and subsequently contaminated with coliforms. Disinfection was undertaken using chlorine dioxide, ozone and a mixed oxidant solution followed by flushing until no disinfectant residual remained. Results showed that coliforms were not persistent on the aircraft plumbing surfaces, and coliforms were not detected after disinfection and flushing with any disinfectant. The one exception was the aerator installed in the lavatory faucet, which was coliform positive after disinfection with ozone and mixed oxidants. These data suggest that the faucet aerators could be a source of coliform contamination that may result in coliform positive samples. Further experiments conducted on disinfection of aerators with glycolic acid and quaternary ammonia (both commonly used by the airlines) showed no detectable coliforms on coliform contaminated aerators after 30 minutes of soaking in the disinfectants.
使用含有游离氯和氯胺混合物的市政自来水对飞机饮用水系统的全尺寸复制品进行预处理，随后用大肠菌群进行污染。分别使用二氧化氯、臭氧和混合氧化剂溶液进行消毒，然后冲洗直至无消毒剂残留。结果表明，大肠菌群在飞机管道表面不会持续存在，并且在使用任何消毒剂进行消毒和冲洗后均未检测到大肠菌群。唯一的例外是安装在卫生间水龙头上的曝气器，在用臭氧和混合氧化剂消毒后大肠菌群呈阳性。这些数据表明，水龙头曝气器可能是大肠菌群污染的一个来源，这可能导致样本大肠菌群呈阳性。对航空公司常用的乙醇酸和季铵盐对曝气器进行消毒的进一步实验表明，在消毒剂中浸泡30分钟后，大肠菌群污染的曝气器上未检测到大肠菌群。
