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| Legionella |
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| Order Number | Title | Author | Date |
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An Update on ASHRAE Standard 188P: Prevention of Legionellosis Associated with Building Systems |
William F McCoy, Phigenics and Paul Lindahl, Jr., SPX Cooling Technologies |
2012 |
| Abstract: The American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE) has developed a proposed Standard Practice that specifies what is required to prevent legionellosis associated with building water systems. The proposed Standard Practice was approved in July 2010 for public review publication. The first public, review was completed in November 2010; there were many supportive comments posted and also many excellent suggestions to improve the Standard. A revision was produced in response to comments received during the public review. The second public review opened June 10, 2011 and closed July 25. This paper gives perspectives in relation to CTI Standard 159, Legionellosis Related Practices for Evaporative Cooling Water Systems, which is in process and could be public by the time of the presentation of this paper. |
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Biocide Treatments for Controlling Amoeba Amplified Legionella in Cooling Towers |
Jana Rajan and Paul Schook, Dow Microbial Control |
2012 |
| Abstract: There is an expanding body of evidence that highly prevalent free-living amoebae increase both the numbers and virulence of water based, human-pathogenic, amoeba-resisting microorganisms such as Legionella. We have focused on controlling amoeba-amplified forms of Legionella by various biocide regimes commonly used in water treatment and provide proof for a hypothesis that explains the inability of conventional treatments in controlling these hardy and relevant forms. Our studies demonstrate a need to revisit current biocide dosing practices in order to meet the new guidelines for Legionella control in industrial water systems. This paper will discuss, with supporting data, some feasible alternatives that provide adequate control of amoeba-fed Legionella in cooling towers by employing a combination of US EPA approved organic biocides. |
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Efficacy of Non-chemical Devices In Controlling Legionella: Results From A Model Cooling System |
Janet E. Stout, Ph.D., Scott M. Duda, M.S. and Radisav D. Vidic, Ph.D., University of Pittsburgh |
2011 |
| Abstract: The objective of this investigation was to assess the ability of several classes of non-chemical water treatment devices (NCD’s) to control the growth of Legionella in a model cooling system. In addition, water samples from cooling towers treated with NCD’s were also tested. NCD devices did not prevent Legionella growth in the model cooling towers or in field tests. Building owners and engineers should test water samples for Legionella from cooling systems, especially if they are only treated with non-chemical devices. |
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A Systematic Review of Biocides Used in Cooling Towers for the Prevention and Control of Legionella ssp. Contamination |
Kelly Rangel, University of Texas Health and Science Center |
2009 |
| Abstract: The use of biocides is very important for controlling Legionella contamination in evaporative cooling systems. This study is a systematic review of research studies that evaluated the effectiveness of biocides in evaporative cooling systems for Legionella control. |
