TY - JOUR
T1 - Membrane characterization by dynamic hysteresis
T2 - Measurements, mechanisms, and implications for membrane fouling
AU - Lee, Sangyoup
AU - Lee, Eunsu
AU - Elimelech, Menachem
AU - Hong, Seungkwan
N1 - Funding Information:
This research was supported by the Seawater Engineering & Architecture of High Efficiency Reverse Osmosis (SEAHERO) program supported by the Ministry of Land, Transport and Maritime Affairs (MLTM) and partly by the World Class University (WCU) program (Case III) through the National Research Foundation of Korea , which is funded by the Ministry of Education, Science and Technology ( R33-10046 ).
PY - 2011/1/1
Y1 - 2011/1/1
N2 - The surface characteristics of reverse osmosis membranes and their relation to membrane fouling are systematically investigated by measuring membrane dynamic hysteresis based on the Wilhelmy plate method. Dynamic hysteresis represents the difference between the forces applied to a membrane surface when it is advanced into and withdrawn from a liquid or solution. Our results demonstrate that the chemical surface heterogeneity of various RO membranes could be quantified by measuring their dynamic hysteresis. The chemical heterogeneity was mostly related to the distribution of surface charge rather than average zeta potential. There was a remarkable correlation between the chemical surface heterogeneity and membrane dynamic hysteresis. It was clearly shown that dynamic hysteresis varied substantially with respect to the solution chemistry of test solutions. The dynamic hysteresis of RO membranes measured in the presence of organic foulants was further related to the flux-decline rate determined from bench-scale fouling experiments. It was found that higher flux-decline rate was obtained for RO membranes with larger dynamic hysteresis. Based on the results in this study, it is demonstrated that dynamic hysteresis measurements can be a promising tool for characterizing membrane surfaces as well as assessing membrane fouling.
AB - The surface characteristics of reverse osmosis membranes and their relation to membrane fouling are systematically investigated by measuring membrane dynamic hysteresis based on the Wilhelmy plate method. Dynamic hysteresis represents the difference between the forces applied to a membrane surface when it is advanced into and withdrawn from a liquid or solution. Our results demonstrate that the chemical surface heterogeneity of various RO membranes could be quantified by measuring their dynamic hysteresis. The chemical heterogeneity was mostly related to the distribution of surface charge rather than average zeta potential. There was a remarkable correlation between the chemical surface heterogeneity and membrane dynamic hysteresis. It was clearly shown that dynamic hysteresis varied substantially with respect to the solution chemistry of test solutions. The dynamic hysteresis of RO membranes measured in the presence of organic foulants was further related to the flux-decline rate determined from bench-scale fouling experiments. It was found that higher flux-decline rate was obtained for RO membranes with larger dynamic hysteresis. Based on the results in this study, it is demonstrated that dynamic hysteresis measurements can be a promising tool for characterizing membrane surfaces as well as assessing membrane fouling.
KW - Charge distribution
KW - Dynamic hysteresis
KW - Membrane fouling
KW - RO membrane
KW - Surface heterogeneity
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U2 - 10.1016/j.memsci.2010.09.024
DO - 10.1016/j.memsci.2010.09.024
M3 - Article
AN - SCOPUS:78649450007
VL - 366
SP - 17
EP - 24
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
IS - 1-2
ER -