[논문]Controlling Legionella in a UK hospital using copper and silver ionisation-A case study

Barbosa, V.L.; Thompson, K.C.

doi:10.1016/j.jece.2016.06.016

Controlling Legionella in a UK hospital using copper and silver ionisation-A case study

Journal of environmental chemical engineering, v.4 no.3, 2016년, pp.3330 - 3337

Barbosa, V.L. , Thompson, K.C.

Abstract ▼ AI-Helper

This paper describes work that evaluated a copper and silver ionisation system, comprising 99.99% copper and 99.99% silver electrodes, installed as a replacement to a low performing chlorine dioxide (ClO2) system for the control of Legionella in a UK hospital. The system was used in conjunction with the existing temperature regime and was installed upstream of the water storage tanks to allow adequate build-up of copper and silver in tanks so that good levels were available for distribution to outlets. Samples were taken monthly and analyzed for Legionella, by the culture method, and for copper and silver by Inductively Coupled Plasma-Optical Emission Spectroscopy/Mass Spectrometry over a four-year period. The results showed that water temperature above 55oC did not control L. pneumophila in 25 out of 140 outlets. The copper and silver ionisation system had initial problems during the commissioning stage and up to four months after commissioning, owing to deadlegs, deadends and low-use outlets. Once these problems were solved, Legionella was controlled consistently and monthly monitoring of outlets has showed no positive result for 15 months. It was concluded that: Legionella could not be effectively controlled using a temperature regime alone, even when temperature was maintained at below 20oC or at above 55oC; and that copper and silver ionisation was effective for Legionella control provided the system was regularly monitored to ensure the required concentration of ions was maintained, so that potential Legionella sources, such as build-up of biofilms in rubber-lined hoses, were dealt with as soon as detected.

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참고문헌 (26)

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Controlling Legionella in a UK hospital using copper and silver ionisation-A case study

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