A combined filtration—reverse-osmosis water recovery system has been evaluated to determine its capability to reclaim domestic wash water for reuse as a commode water sup¬ply. The system produced water that met all chemical and physical requirements established by the U.S. Public Health Service for drinking water with the exception of carbon chloroform extractables, methylene blue active substances, and phenols. It is thought that this water is of sufficient quality to be reused as commode supply water. The filters, which were used to protect the reverse-osmosis unit from plugging, did not sufficiently perform this-function because they were not capable of removing particles less than 1 fim in size from the waste water. The process rate of the reverse-osmosis unit was degraded by approximately 46.9 percent for the 2.7 m3 (713 gallons) of filtered wash water processed. The energy required to process the wash water through the filtration unit and reverse osmosis unit averaged 2.37 kilowatt-hours per cubic meter (0.00897 kilowatt-hour per gallon) and 16.87 kilowatt-hours per cubic meter (0.0639 kilowatt-hour per gallon), respectively.
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