Disinfection of bacteria in water systems by using electrolytically generated copper: Silver and reduced levels of free chlorine

M. T. Yahya, L. K. Landeen, M. C. Messina, S. M. Kutz, R. Schulze, Charles P Gerba

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

As an alternative disinfectant to chlorination, electrolytically generated copper:silver (400 and 40 μg/L copper and silver, respectively) with and without free chlorine (0.3 mg/L) was evaluated over a period of 4 weeks in indoor and outdoor water systems (100 L tap water with natural body flora and urine). Numbers of total coliform, pseudomonas, and staphylococci were all less than drinking water standards in systems treated with copper:silver and free chlorine and systems treated with free chlorine alone (1.0 mg/L). No significant differences (p ≤ 0.05) in bacterial numbers were observed between systems with copper:silver and free chlorine and those with free chlorine alone. Overall, free-chlorine treatments (0.3 or 1.0 mg/L) showed significantly lower heterotrophic plate numbers than those without free chlorine. When challenged with a natural Staphylococcus sp. isolate, water with copper:silver and free chlorine had a 2.4 log10 reduction in bacterial numbers within 2 min, while free chlorine alone or copper:silver alone showed 1.5 and 0.03 log10 reductions, respectively. Addition of copper:silver to water systems may allow the concentration of free chlorine to be reduced while still providing comparable sanitary quality of the water.

Original languageEnglish (US)
Pages (from-to)109-116
Number of pages8
JournalCanadian Journal of Microbiology
Volume36
Issue number2
StatePublished - 1990

Fingerprint

Disinfection
Chlorine
Silver
Copper
Bacteria
Water
Staphylococcus
Disinfectants
Chlorination
Halogenation
Water Quality
Pseudomonas
Drinking Water
Urine

Keywords

  • Chlorine
  • Copper
  • Disinfection
  • Silver
  • Water

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biotechnology
  • Immunology
  • Microbiology

Cite this

Disinfection of bacteria in water systems by using electrolytically generated copper : Silver and reduced levels of free chlorine. / Yahya, M. T.; Landeen, L. K.; Messina, M. C.; Kutz, S. M.; Schulze, R.; Gerba, Charles P.

In: Canadian Journal of Microbiology, Vol. 36, No. 2, 1990, p. 109-116.

Research output: Contribution to journalArticle

Yahya, M. T. ; Landeen, L. K. ; Messina, M. C. ; Kutz, S. M. ; Schulze, R. ; Gerba, Charles P. / Disinfection of bacteria in water systems by using electrolytically generated copper : Silver and reduced levels of free chlorine. In: Canadian Journal of Microbiology. 1990 ; Vol. 36, No. 2. pp. 109-116.
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