Hyperfiltration wash water recovery subsystem - Design and test resultsThe Hyperfiltration Wash Water Recovery (HWWR) subsystem, designed to offer low-power high-volume wash water purification for extended mission spacecraft, is discussed in terms of preprototype design and configuration. Heated wash water collected from the shower, hand wash, and laundry flows into a temperature-controlled (374 K) waste storage tank. Two parallel 25 micron absolute filters at the tank outlet remove large particles from the feed stream. A positive displacement feed pump delivers wash water to the hyperfiltration module at a constant flow rate of 0.20 lpm with discharge pressure variations from 4181-7239 Kpa. The hyperfiltration membrane module is a single-pass design including 36 porous stainless steel tubes, and is designed to provide an approximate water recovery rate of 90 percent. Permeate and brine water flows are monitored by flow meters, and removal of urea and ammonia is achieved by adding 15 percent NaOCl solution to the permeate fluid stream. An alternate module design using two diameters of tubing (allowing a smaller pressure drop and a larger membrane area) gave a superior predicted performance over the first module with larger tubing throughout.
Document ID
19840046260
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Reysa, R. P. (Boeing Aerospace Co. Houston, TX, United States)
Price, D. F. (NASA Johnson Space Center Houston, TX, United States)
Olcott, T. (Lockheed Missiles and Space Corp. Palo Alto, CA, United States)
Gaddis, J. L. (Clemson University Clemson, SC, United States)