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Recent experiences with iodine water disinfection in ShuttleMicrobial proliferation in the STS potable water system is prevented by maintaining a 2-5 ppm iodine residual. The iodine is added to fuel cell water by an iodinated ion exchange resin in the Microbial Check Valve (MCV). Crew comments indicated excessive iodine in the potable water. To better define the problem, a method of in-flight iodine analysis was developed. Inflight analysis during STS-30 and STS-28 indicated iodine residuals were generally in the 9-13 ppm range. It was determined that the high iodine residual was caused by MCV influent temperatures in excess of 120 F. This is well above the MCV operating range of 65-90 F. The solution to this problem was to develop a resin suitable for the higher temperatures. Since 8 months were required to formulate a MCV resin suitable for the higher temperatures, a temporary solution was necessary. Two additional MCV's were installed on the chilled and ambient water lines leading into the galley to remove the excess iodine. These reduced the iodine residual to 3-4 ppm during STS-33, STS-34, STS-36 and STS-32. A high-temperature resin was formulated and initially flown on STS-31.
Document ID
19900062334
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gibbons, Randall E.
(Krug International Houston, TX, United States)
Flanagan, David T.
(Krug International Houston, TX, United States)
Schultz, John R.
(Krug International Houston, TX, United States)
Sauer, Richard L.
(Krug International Houston, TX, United States)
Slezak, Terry N.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1990
Subject Category
Man/System Technology And Life Support
Report/Patent Number
SAE PAPER 901356
Accession Number
90A49389
Distribution Limits
Public
Copyright
Other

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