TY - JOUR
T1 - Rotating reverse osmosis and spiral wound reverse osmosis filtration
T2 - A comparison
AU - Shah, Tapan N.
AU - Yoon, Yeomin
AU - Pederson, Cynthia L.
AU - Lueptow, Richard M.
N1 - Funding Information:
This work was supported by National Aeronautics and Space Administration (NASA).
PY - 2006/11/15
Y1 - 2006/11/15
N2 - Wastewater produced by the crew members on a long-term space mission needs to be recovered as potable water. Reverse osmosis (RO) has long been in use as a physical membrane separation technology for wastewater treatment. However, membrane fouling and concentration polarization have limited the efficiency for high recovery reverse osmosis systems. An advanced high pressure rotating RO device was designed to minimize these problems by the rotation of the cylindrical RO filter producing shear and Taylor vortices in the annulus of the device. We compare the performance of the rotating RO device to a standard spiral wound RO module using a commercially-available RO membrane under conditions of very high recovery and similar permeate flux. The studies were conducted using 0.01N sodium chloride solution and biological water processor effluent (BWPE) as model wastewaters. The results for 100% recovery of water from 0.01N sodium chloride solution show that the spiral wound RO has poor rejection (<5%) compared to more than 75% rejection for the rotating RO over a period of 2 days. Similar differences in rejection were observed for BWPE for a 5-day test at high recoveries. The overall ion rejection, dissolved organic carbon (DOC) rejection, and ammonium ion rejection from BWPE was typically two times higher for the rotating RO system than for spiral wound RO at 70-80% recovery. Thus, while rotating RO is a more complicated system than spiral wound RO, it provides better rejection of contaminants at very high recoveries.
AB - Wastewater produced by the crew members on a long-term space mission needs to be recovered as potable water. Reverse osmosis (RO) has long been in use as a physical membrane separation technology for wastewater treatment. However, membrane fouling and concentration polarization have limited the efficiency for high recovery reverse osmosis systems. An advanced high pressure rotating RO device was designed to minimize these problems by the rotation of the cylindrical RO filter producing shear and Taylor vortices in the annulus of the device. We compare the performance of the rotating RO device to a standard spiral wound RO module using a commercially-available RO membrane under conditions of very high recovery and similar permeate flux. The studies were conducted using 0.01N sodium chloride solution and biological water processor effluent (BWPE) as model wastewaters. The results for 100% recovery of water from 0.01N sodium chloride solution show that the spiral wound RO has poor rejection (<5%) compared to more than 75% rejection for the rotating RO over a period of 2 days. Similar differences in rejection were observed for BWPE for a 5-day test at high recoveries. The overall ion rejection, dissolved organic carbon (DOC) rejection, and ammonium ion rejection from BWPE was typically two times higher for the rotating RO system than for spiral wound RO at 70-80% recovery. Thus, while rotating RO is a more complicated system than spiral wound RO, it provides better rejection of contaminants at very high recoveries.
KW - Rejection
KW - Rotating reverse osmosis
KW - Spiral wound membrane
KW - Wastewater treatment
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U2 - 10.1016/j.memsci.2006.09.004
DO - 10.1016/j.memsci.2006.09.004
M3 - Article
AN - SCOPUS:33750026919
VL - 285
SP - 353
EP - 361
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
IS - 1-2
ER -