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.
@article{6e17c62d02f84efe902b7e36e378f1a7,
title = "Disinfection of bacteria in water systems by using electrolytically generated copper: Silver and reduced levels of free chlorine",
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.",
keywords = "Chlorine, Copper, Disinfection, Silver, Water",
author = "Yahya, {M. T.} and Landeen, {L. K.} and Messina, {M. C.} and Kutz, {S. M.} and R. Schulze and Gerba, {Charles P}",
year = "1990",
language = "English (US)",
volume = "36",
pages = "109--116",
journal = "Canadian Journal of Microbiology",
issn = "0008-4166",
publisher = "National Research Council of Canada",
number = "2",

}

TY - JOUR

T1 - Disinfection of bacteria in water systems by using electrolytically generated copper

T2 - Silver and reduced levels of free chlorine

AU - Yahya, M. T.

AU - Landeen, L. K.

AU - Messina, M. C.

AU - Kutz, S. M.

AU - Schulze, R.

AU - Gerba, Charles P

PY - 1990

Y1 - 1990

N2 - 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.

AB - 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.

KW - Chlorine

KW - Copper

KW - Disinfection

KW - Silver

KW - Water

UR - http://www.scopus.com/inward/record.url?scp=0025212522&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025212522&partnerID=8YFLogxK

M3 - Article

VL - 36

SP - 109

EP - 116

JO - Canadian Journal of Microbiology

JF - Canadian Journal of Microbiology

SN - 0008-4166

IS - 2

ER -