The survival and recovery of Salmonella in Tucson's wastewater reclamation program
Committee ChairLudovici, Peter P.
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PublisherThe University of Arizona.
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AbstractAn investigation into the survival and recovery of Salmonella and Shiella in Tucson's wastewaters was conducted as one aspect of a program dealing with the use of a pilot soil fitter to reclaim water from secondary treated sewage. Only a rare Salmonella and no Shigella were detected in the sewage or activated sludge effluents. When Salmonella typhimurium was added to wastewaters, recovery was dependent on the number of indigenous organisms. Salmonella typhimurium could not be recovered from sewage when the ratio of added Salmonella to indigenous organisms was 1:500,000 per ml. When the ratio was 1:50,000 per ml, Salmonella typhimuriurn was recoverable. When the indigenous organisms were removed by membrane filtration or reduced by high-speed centrifugation, added Salmonella typhimurium or Shigella flexneri not only survived but increased 2 to 5 logs in 24 hours.
Degree ProgramMicrobiology and Medical Technology