Determining Minimum Ion Exchange Resin Usage for NOM Removal
Publication: Journal of Environmental Engineering
Volume 138, Issue 10
Abstract
For the design and analysis of an ion exchange (IEX) process, it is necessary to know the minimum IEX resin usage defined thermodynamically. Anion exchange resin sorption of dissolved natural organic matter (NOM) may follow an isotherm of either Type I or Type II, which are noticeably different at high surface coverage. The charge density of NOM, which monotonically increases with the pH, appears to play a critical role. Basic pH (high charge density) favors a Type I isotherm and acidic pH (low charge density) may change the isotherm to Type II. The Langmuir equation and the Wiegner-Jenny-Summers-Roberts (WJSR) equation can be used to quantify the Type I and Type II isotherms, respectively. Explicit relationships between minimum resin usage and desired level of removal are subsequently developed and the isotherm constants, along with the non-removable NOM fraction, are simultaneously estimated by an innovative least-squares regression (LSR) approach. The Langmuir isotherm-based model accurately describes the sorption removal of Type I isotherm, and the WJSR isotherm-based model accurately describes the sorption removal of Type II isotherm. At removals , however, the two sorption models offer comparable minimum IEX resin usages. The sorption models and LSR methods developed herein are applicable to resin slurry contactors, including batch reactors, plug flow reactors, or continuous-flow stirred tank reactors.
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Acknowledgments
The authors would like to acknowledge the use of the isotherm data previously published by Dr. Y. R. Tan and Dr. J. E. Kilduff in Figs. 2 and 4. Valuable comments by the editor and the three anonymous reviewers are also greatly appreciated.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 138 • Issue 10 • October 2012
Pages: 1058 - 1066
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 18, 2011
Accepted: Mar 14, 2012
Published online: Mar 16, 2012
Published in print: Oct 1, 2012
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