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Properties governing the transport of trace organic contaminants through ion-exchange membranes

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Abstract
Ion exchange membranes could provide a solution to the selective separation of organic and inorganic components in industrial wastewater. The phenomena governing the transport of organics through the IEM however, are not yet fully understood. Therefore, the transport of trace organic contaminants (TOrCs) as a model for a wide variety of organic compounds was studied under different conditions. It was found that in the absence of salt and external potential, the chemical equilibrium is the main driver for TOrC-transport, resulting in the transport of mainly charged TOrCs. When salt is present, the transport of TOrCs is hampered in favor of the NaCl transport, which shows a preferential interaction with the membranes due to its small size, high mobility and concentration. It is hypothesized that electrostatic interactions and electron donor/acceptor interactions are the main drivers for TOrC transport and that transport is mainly diffusion driven. This was confirmed in the experiments with different current densities, where the external potential seemed to have only a minor influence on the transport of TOrCs. It is only when the salt becomes nearly completely depleted that the TOrCs are transported as charge carriers. This shows that it is very difficult to get preferential transport of organic compounds due to the diffusive nature of their transport.
Keywords
ELECTRODIALYSIS MEMBRANES, WASTE-WATER, NANOFILTRATION, HYDROGEN GAS-PRODUCTION, MICROBIAL ELECTROLYSIS CELLS, ULTRAFILTRATION MEMBRANES, REVERSE-OSMOSIS, DESALINATION, CARBONATE CONCENTRATIONS, ANION

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Chicago
Vanoppen, Marjolein, Annelise Bakelants, Dorien Gaublomme, Klaas Schoutteten, Julie Vanden Bussche, Lynn Vanhaecke, and Arne Verliefde. 2015. “Properties Governing the Transport of Trace Organic Contaminants Through Ion-exchange Membranes.” Environmental Science & Technology 49 (1): 489–497.
APA
Vanoppen, M., Bakelants, A., Gaublomme, D., Schoutteten, K., Vanden Bussche, J., Vanhaecke, L., & Verliefde, A. (2015). Properties governing the transport of trace organic contaminants through ion-exchange membranes. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 49(1), 489–497.
Vancouver
1.
Vanoppen M, Bakelants A, Gaublomme D, Schoutteten K, Vanden Bussche J, Vanhaecke L, et al. Properties governing the transport of trace organic contaminants through ion-exchange membranes. ENVIRONMENTAL SCIENCE & TECHNOLOGY. 2015;49(1):489–97.
MLA
Vanoppen, Marjolein, Annelise Bakelants, Dorien Gaublomme, et al. “Properties Governing the Transport of Trace Organic Contaminants Through Ion-exchange Membranes.” ENVIRONMENTAL SCIENCE & TECHNOLOGY 49.1 (2015): 489–497. Print.
@article{5897544,
  abstract     = {Ion exchange membranes could provide a solution to the selective separation of organic and inorganic components in industrial wastewater. The phenomena governing the transport of organics through the IEM however, are not yet fully understood. Therefore, the transport of trace organic contaminants (TOrCs) as a model for a wide variety of organic compounds was studied under different conditions. It was found that in the absence of salt and external potential, the chemical equilibrium is the main driver for TOrC-transport, resulting in the transport of mainly charged TOrCs. When salt is present, the transport of TOrCs is hampered in favor of the NaCl transport, which shows a preferential interaction with the membranes due to its small size, high mobility and concentration. It is hypothesized that electrostatic interactions and electron donor/acceptor interactions are the main drivers for TOrC transport and that transport is mainly diffusion driven. This was confirmed in the experiments with different current densities, where the external potential seemed to have only a minor influence on the transport of TOrCs. It is only when the salt becomes nearly completely depleted that the TOrCs are transported as charge carriers. This shows that it is very difficult to get preferential transport of organic compounds due to the diffusive nature of their transport.},
  author       = {Vanoppen, Marjolein and Bakelants, Annelise and Gaublomme, Dorien and Schoutteten, Klaas and Vanden Bussche, Julie and Vanhaecke, Lynn and Verliefde, Arne},
  issn         = {0013-936X},
  journal      = {ENVIRONMENTAL SCIENCE \& TECHNOLOGY},
  keyword      = {ELECTRODIALYSIS MEMBRANES,WASTE-WATER,NANOFILTRATION,HYDROGEN GAS-PRODUCTION,MICROBIAL ELECTROLYSIS CELLS,ULTRAFILTRATION MEMBRANES,REVERSE-OSMOSIS,DESALINATION,CARBONATE CONCENTRATIONS,ANION},
  language     = {eng},
  number       = {1},
  pages        = {489--497},
  title        = {Properties governing the transport of trace organic contaminants through ion-exchange membranes},
  url          = {http://dx.doi.org/10.1021/es504389q},
  volume       = {49},
  year         = {2015},
}

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