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Title of Journal: Water Sci Technol

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Abbravation: Water Science and Technology

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IWA Publishing

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DOI

10.1016/0006-3207(92)90839-f

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ISSN

0273-1223

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Efficacy of a combined system of copper and silver

Authors: Cassells J M Yahya M T Gerba C P Rose J B
Publish Date: 1995/03/01
Volume: 31, Issue: 5-6, Pages: 119-122
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Abstract

J M Cassells M T Yahya C P Gerba J B Rose Efficacy of a combined system of copper and silver and free chlorine for inactivation of Naegleria fowleri amoebas in water Water Sci Technol 1 March 1995 31 56 119–122 doi https//doiorg/102166/wst19950578J M Cassells M T Yahya C P Gerba J B Rose Efficacy of a combined system of copper and silver and free chlorine for inactivation of Naegleria fowleri amoebas in water Water Sci Technol 1 March 1995 31 56 119–122 doi https//doiorg/102166/wst19950578Electrolytically generated copper and silver ions 40040 and 80080 μg/l were evaluated separately and combined with 10 mg/l free chlorine for their efficacy in reducing the viable numbers of Naegleria fowleri amoebas in water pH 73 and 2325°C Inactivation rates k = log10 reduction/min and T99 values exposure time required to achieve a 99 or a 2 log10 reduction of the disinfectants were determined Copper and silver alone at ratio of 40040 to 80080 μg/l caused no significant inactivation of N fowleri even after 72 hours of exposure k = 000017 and 000013 respectively Addition of 10 mg/l free chlorine to water which contained 40040 or 80080 μg/l copper and silver resulted in enhanced inactivation rates k = 0458 and 0515 respectively compared to either chlorine alone k = 033 or the metals alone Water containing 80080 μg/l copper and silver with 10 mg/l chlorine showed a T99 value of 39 minutes while chlorine alone showed a T99 of 61 minutes Enhanced inactivation of N fowleri by a combined system of free chlorine and copper and silver may be attributed to the different mechanism that each disinfectant utilizes in inactivating the amoebas and may suggest a synergistic effect

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  2. Detection of F+ bacteriophage in large volumes of water by a membrane filter method (MFM)
  3. Estimation of the fate of microbial water quality contaminants in a South African river
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