TY - JOUR
T1 - Effects of magnetic ion exchange pretreatment on low pressure membrane filtration of natural surface water
AU - Huang, Haiou
AU - Cho, Hyun Hee
AU - Schwab, Kellogg J.
AU - Jacangelo, Joseph G.
N1 - Funding Information:
The authors would like to thank the Northern Bay Regional Water Treatment Plant, California, USA for providing water samples, Orica WaterCare for providing MIEX resin, and membrane manufacturers for providing membrane fibers employed in this study. We are grateful to Mr. James Schissler for conducting MS2 enumeration and Dr. Kai Loon Chen and his students for performing electrophoretic mobility and dynamic light scattering measurements. Dr. John Tobiason, Dr. Scott Summers, and Dr. Philip Singer provided valuable comments and suggestions during the study. This study was primarily funded by Solano County Water Agency (SCWA), California, USA through MWH Americas. David Okita and Alex Rabidoux who were the project principals at SCWA; and William Taplin and Stefani Harrison who were the project director and project manager for MWH Americas, respectively, are thanked for the support and advice. Additional funding was provided by the Johns Hopkins University Global Water Program and Center for Water and Health , as well as the Osprey Foundation of Maryland .
PY - 2012/11/1
Y1 - 2012/11/1
N2 - Magnetic ion exchange (MIEX) pretreatment has been increasingly employed by water treatment plants for removal of dissolved organic carbon (DOC). In this study, the effects of MIEX pretreatment on low pressure membrane filtration of natural surface water were investigated under different feedwater qualities, membrane properties, and MIEX dosing conditions. Regardless of feedwater DOC, moderate decrease in the total and hydraulically irreversible fouling was observed for a polyvinylidene fluoride (PVDF) microfiltration membrane and a polyethersulfone ultrafiltration (UF) membrane after MIEX pretreatment, which was coincident with moderate removals of high molecular weight DOC in the feedwaters. Comparatively, the fouling of a PVDF UF membrane did not decrease after MIEX pretreatment, revealing the impact of membrane properties on membrane fouling in the presence of MIEX pretreatment. Reuse of virgin or regenerated MIEX resulted in similar membrane fouling as observed with single use of the virgin MIEX. The level of DOC removal by MIEX was similar to the removal of MS2 bacteriophage spiked in the feedwater, suggesting a potential similarity in the removal of organic and microbial particles. In conclusion, MIEX pretreatment was effective for DOC removal, but less effective in controlling short-term membrane fouling or removing viruses.
AB - Magnetic ion exchange (MIEX) pretreatment has been increasingly employed by water treatment plants for removal of dissolved organic carbon (DOC). In this study, the effects of MIEX pretreatment on low pressure membrane filtration of natural surface water were investigated under different feedwater qualities, membrane properties, and MIEX dosing conditions. Regardless of feedwater DOC, moderate decrease in the total and hydraulically irreversible fouling was observed for a polyvinylidene fluoride (PVDF) microfiltration membrane and a polyethersulfone ultrafiltration (UF) membrane after MIEX pretreatment, which was coincident with moderate removals of high molecular weight DOC in the feedwaters. Comparatively, the fouling of a PVDF UF membrane did not decrease after MIEX pretreatment, revealing the impact of membrane properties on membrane fouling in the presence of MIEX pretreatment. Reuse of virgin or regenerated MIEX resulted in similar membrane fouling as observed with single use of the virgin MIEX. The level of DOC removal by MIEX was similar to the removal of MS2 bacteriophage spiked in the feedwater, suggesting a potential similarity in the removal of organic and microbial particles. In conclusion, MIEX pretreatment was effective for DOC removal, but less effective in controlling short-term membrane fouling or removing viruses.
KW - Feedwater pretreatment
KW - Low pressure membrane filtration
KW - Magnetic ion exchange
KW - Natural organic matter
KW - Surface water
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U2 - 10.1016/j.watres.2012.07.003
DO - 10.1016/j.watres.2012.07.003
M3 - Article
C2 - 22929562
AN - SCOPUS:84865961787
SN - 0043-1354
VL - 46
SP - 5483
EP - 5490
JO - Water Research
JF - Water Research
IS - 17
ER -