ID:
publications-4107
Type:
article
Year:
2007
Authors:
Silvestry-Rodriguez, Nadia and Silvestry-Rodriguez, Nadia and Bright, Kelly R. and Bright, Kelly R. and Uhlmann, D. R. and Uhlmann, Donald R and Slack, D. C. and Slack, Donald C and Gerba, Charles P. and Gerba, Charles P.
Title:
Inactivation of Pseudomonas aeruginosa and Aeromonas hydrophila by silver in tap water.
Venue/Journal:
Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering
DOI:
10.1080/10934520701517689
Research type:
Water System:
Technical Focus:
Abstract:
This study was conducted to assess the efficacy of silver as a secondary disinfectant to replace or reduce the level of chlorine utilized in water distribution systems. Pseudomonas aeruginosa and Aeromonas hydrophila are opportunistic pathogens present in drinking water and have been associated with waterborne disease. After 8 hours of exposure to 100 ΞΌ g/L of silver, there was a > 6-log10 reduction in P. aeruginosa in tap water at room temperature at pH7 and a 5.55-log10 reduction in the presence of 3 mg/L humic acid. Similar reductions were observed at pH9. At 4Β°C, reductions greater than 4-log10 were observed after 24 hours. For A. hydrophila, a > 6-log10 reduction occurred at both pH7 and pH9 within nine hours. The World Health Organization has determined that this amount of silver could be used for water disinfection without health risks. Furthermore, silver shows promise as a secondary disinfectant, even in the presence of organic matter in concentrations that would reduce the effectiveness of free ...
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