Armstrong Andrew M, Sobsey Mark D, Casanova Lisa M
Water Missions International, 1150 Kinzer Street, Building 1605, N. Charleston, SC 29405-1484, USA.
Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA.
J Water Health. 2016 Jun;14(3):424-32. doi: 10.2166/wh.2016.059.
When households lack access to continuous piped water, water storage in the home creates opportunities for contamination. Storage in copper vessels has been shown to reduce microbes, but inactivation kinetics of enteric bacteria in water by copper alone needs to be understood. This work characterized inactivation kinetics of Escherichia coli and Pseudomonas aeruginosa by dissolved ionic copper in water. Reductions of E. coli and P. aeruginosa increase with increasing dose. At 0.3 mg/L, there was a 2.5 log10 reduction of E. coli within 6 hours. At 1 and 3 mg/L, the detection limit was reached between 3 and 6 hours; maximum reduction measured was 8.5 log10. For P. aeruginosa, at 6 hours there was 1 log10 reduction at 0.3 mg/L, 3.0 log10 at 1 mg/L, and 3.6 log10 at 3 mg/L. There was no significant decline in copper concentration. Copper inactivates bacteria under controlled conditions at doses between 0.3 and 1 mg/L. E. coli was inactivated more rapidly than P. aeruginosa. Copper at 1 mg/L can achieve 99.9% inactivation of P. aeruginosa and 99.9999997% inactivation of E. coli over 6 hours, making it a candidate treatment for stored household water.
当家庭无法获得持续的管道供水时，家庭中的储水就会造成污染的机会。已证明储存在铜容器中可减少微生物，但仅铜对水中肠道细菌的失活动力学需要了解。这项工作表征了水中溶解的离子铜对大肠杆菌和铜绿假单胞菌的失活动力学。大肠杆菌和铜绿假单胞菌的减少量随剂量增加而增加。在0.3毫克/升时，6小时内大肠杆菌减少了2.5个对数10。在1毫克/升和3毫克/升时，3至6小时达到检测限；测得的最大减少量为8.5个对数10。对于铜绿假单胞菌，6小时时，0.3毫克/升减少1个对数10，1毫克/升减少3.0个对数10，3毫克/升减少3.6个对数10。铜浓度没有显著下降。在0.3至1毫克/升的剂量下，铜在受控条件下可使细菌失活。大肠杆菌比铜绿假单胞菌失活更快。1毫克/升的铜在6小时内可使铜绿假单胞菌失活99.9%，使大肠杆菌失活99.9999997%，使其成为家庭储水的候选处理方法。
