Technical Paper
Microbial Biofilm Studies of the Environmental Control and Life Support System Water Recovery Test for Space Station Freedom
1991-07-01
911378
NASA is developing a Water Recovery System (WRS) for Space Station Freedom to reclaim human waste water for reuse by astronauts as hygiene or potable water. A Water Recovery Test (WRT) currently in progress investigates the performance of a prototype of the WRS. Analysis of biofilm accumulation, the potential for microbially influenced corrosion (MIC) in the WRT, and studies of iodine disinfection of biofilm are reported. Analysis of WRT components indicated the presence of organic deposits and biofilms in selected tubing. Water samples from the WRT contained acid-producing and sulfate-reducing organisms implicated in corrosion processes. Corrosion of an aluminum alloy was accelerated in the presence of these water samples; however, stainless steel corrosion rates were not accelerated.