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    Vapor-induced transfer of bacteria in the absence of mechanical disturbances

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    Type
    Article
    Authors
    Ayoub, George M.
    Dahdah, Lamia
    Alameddine, Ibrahim M.
    Malaeb, Lilian
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-09
    Permanent link to this record
    http://hdl.handle.net/10754/563738
    
    Metadata
    Show full item record
    Abstract
    Transfer of bacteria through water vapor generated at moderate temperatures (30-50. °C) in passive solar stills, has scarcely been reported. The objective of this research was to investigate whether bacteria in highly humid atmospheres can get transferred through water vapor in the absence of other transfer media to find their way to the distillate. To achieve this objective, passive solar reactors were chosen as the medium for experimentation, and distillation experiments were conducted by spiking a pure bacterial culture (Escherichia coli, Klebsiella pneumonia or Enterococcus faecalis) in low mineralized water vs. highly mineralized water in the dark under moderate temperatures ranges (30-35. °C, 40-45. °C and 50-55. °C). Results showed that bacteria indeed get transferred with the vapor in stills when not exposed to solar U.V. radiation. The trends observed were adequately explained by a zero-modified Hurdle-Poisson model. The numbers of cultivable bacterial colonies transferred were bacterial size, water type and temperature dependent with highest transfers occurring in E. faecalis>. E. coli>. K. pneumonia at the 40. °C range in low mineralized water. Proper management strategies are recommended to achieve complete disinfection in solar stills. © 2014 Elsevier B.V.
    Citation
    Ayoub, G. M., Dahdah, L., Alameddine, I., & Malaeb, L. (2014). Vapor-induced transfer of bacteria in the absence of mechanical disturbances. Journal of Hazardous Materials, 280, 279–287. doi:10.1016/j.jhazmat.2014.08.003
    Sponsors
    The study was made possible by funding from the Lebanese National Council for Scientific Research (NCSR). Any views, findings or conclusions expressed are those of the authors and do not necessarily reflect the views of the NCSR. The authors extend their appreciation to Professor George Araj, Director of Clinical Microbiology, for extending his help and advice.
    Publisher
    Elsevier BV
    Journal
    Journal of Hazardous Materials
    DOI
    10.1016/j.jhazmat.2014.08.003
    PubMed ID
    25169809
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jhazmat.2014.08.003
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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