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Aquatic biofilms and their responses to disinfection and invading speciesThe control of microbial contamination is a primary concern in the development of a water reclamation system for long-duration manned space flights. This paper describes bench-scale experiments, using both static and recycling water systems, investigating the interaction of bacterial species in the development of a biofilm and their response to the introduction of a disinfectant or of additional species. The results showed that iodine concentrations as high as 15 to 20 mg/l I2 are necessary to completely disinfect a stable biofilm. When S. aueus and E. coli were introduced into a system containing natural mixed culture biofilms, their colonization in the biofilms increased their survival time, from 3 to 5 days as unattached cells to over 60 days when protected in the biofilms. While iodine concentrations of 0.5 to 1 mg/l were enough to eliminate these organisms from the bulk water, concentrations higher than 4.0 mg/l were necessary to completely eliminate these organisms from the biofilm.
Document ID
19930057390
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smithers, G. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Rodgers, E. B.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Obenhuber, D. C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Huff, T. L.
(Sverdrup Technology, Inc. Huntsville, AL, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1992
Subject Category
Man/System Technology And Life Support
Report/Patent Number
SAE PAPER 921211
Meeting Information
Meeting: SAE, International Conference on Environmental Systems
Location: Seattle, WA
Country: United States
Start Date: July 13, 1992
End Date: July 16, 1992
Sponsors: SAE
Accession Number
93A41387
Distribution Limits
Public
Copyright
Other

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