TY - JOUR
T1 - Electro-Forward Osmosis
AU - Son, Moon
AU - Kim, Taeyoung
AU - Yang, Wulin
AU - Gorski, Christopher A.
AU - Logan, Bruce
N1 - KAUST Repository Item: Exported on 2021-03-12
Acknowledged KAUST grant number(s): OSR-2017-CPF-2907-02
Acknowledgements: We thank Dr. Manish Kumar and Mr. Woochul Song at Pennsylvania State University for the loan of the dead-end filtration test device. This research was supported by the King Abdullah University of Science and Technology (KAUST) (OSR-2017-CPF-2907-02) and Pennsylvania State University.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2019/6/18
Y1 - 2019/6/18
N2 - The impact of ion migration induced by an electrical field on water flux in a forward osmosis (FO) process was examined using a thin-film composite (TFC) membrane, held between two cation exchange membranes. An applied fixed current of 100 mA (1.7 mA cm-2) was sustained by the proton flux through the TFC-BW membrane using a feed of 34 mM NaCl, and a 257 mM NaCl draw solution. Protons generated at the anode were transported through the cation exchange membrane and into the draw solution, lowering the pH of the draw solution. Additional proton transport through the TFC-BW membrane also lowered the pH of the feed solution. The localized accumulation of the protons on the draw side of the TFC-BW membrane resulted in high concentration polarization modulus of 1.41 × 105, which enhanced the water flux into the draw solution (5.56 LMH at 100 mA), compared to the control (1.10 LMH with no current). These results using this electro-forward osmosis (EFO) process demonstrated that enhanced water flux into the draw solution could be achieved using ion accumulation induced by an electrical field. The EFO system could be used for FO applications where a limited use of draw solute is necessary.
AB - The impact of ion migration induced by an electrical field on water flux in a forward osmosis (FO) process was examined using a thin-film composite (TFC) membrane, held between two cation exchange membranes. An applied fixed current of 100 mA (1.7 mA cm-2) was sustained by the proton flux through the TFC-BW membrane using a feed of 34 mM NaCl, and a 257 mM NaCl draw solution. Protons generated at the anode were transported through the cation exchange membrane and into the draw solution, lowering the pH of the draw solution. Additional proton transport through the TFC-BW membrane also lowered the pH of the feed solution. The localized accumulation of the protons on the draw side of the TFC-BW membrane resulted in high concentration polarization modulus of 1.41 × 105, which enhanced the water flux into the draw solution (5.56 LMH at 100 mA), compared to the control (1.10 LMH with no current). These results using this electro-forward osmosis (EFO) process demonstrated that enhanced water flux into the draw solution could be achieved using ion accumulation induced by an electrical field. The EFO system could be used for FO applications where a limited use of draw solute is necessary.
UR - http://hdl.handle.net/10754/668096
UR - https://pubs.acs.org/doi/10.1021/acs.est.9b01481
UR - http://www.scopus.com/inward/record.url?scp=85069948782&partnerID=8YFLogxK
U2 - 10.1021/acs.est.9b01481
DO - 10.1021/acs.est.9b01481
M3 - Article
SN - 0013-936X
VL - 53
SP - 8352
EP - 8361
JO - Environmental Science & Technology
JF - Environmental Science & Technology
IS - 14
ER -