Full Description

A complementary disinfection process that uses ultraviolet (UV) radiation as the primarydisinfectant and a chemical disinfectant (iodine) as the residual disinfectant has beendeveloped for use in a long-term space mission scenario. For long-term space missionscenarios, closed-loop water treatment systems are used to continually treat a finiteamount of water for the entire mission. Chemicals added during treatment (e.g.,disinfection) may remain and accumulate in the water as the length of the missionincreases. In addition, bacteria that are not inactivated or removed by treatment may alsopersist and accumulate.To overcome the hurdles associated with a closed-loop system, a complementarydisinfection process has been designed. UV radiation was selected as the primarydisinfectant because it is effective at inactivating a broad spectrum of microorganismsand has minimal potential for the formation of disinfection byproducts. Iodine, which iseffective at inactivating many microorganisms, was selected as the residual disinfectantbecause it has the potential for dual use as an on-line UV monitor and a disinfectant.Also, iodine has been used as a water disinfectant in NASA space missions since the1970s. NASA chose iodine as the disinfectant of choice because it has a low vaporpressure and a relatively long-lasting residual (Columbo 1987). Includes 6 references, figures.

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Edition: Vol. - No. Published: 11/01/2005 Number of Pages: 8File Size: 1 file , 630 KB