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Convective transport of boron through a brackish water reverse osmosis membrane

Kezia, K, Lee, J, Hill, AJ and Kentish, SE (2013) Convective transport of boron through a brackish water reverse osmosis membrane Journal of Membrane Science, 445. pp. 160-169.

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In this work, cross-flow filtration experiments using a brackish water reverse osmosis polyamide membrane have been performed to gather boron rejection data as function of feed concentration, pressure, pH and salinity. Increasing transmembrane pressure increases the permeation of boron indicating that convective flow is important. This result is in contrast to the normal assumption that solution diffusion dominates in such systems. The extended Nernst–Planck equation with a Donnan-steric partition coefficient is used to analyse the transport mechanisms of both neutral boric acid and negatively charged borate ions through the RO membrane. The contribution of surface charge is experimentally determined by streaming potential measurements and the electrokinetic surface charge density is then calculated as a function of ionic strength and pH. It is found that a 0.380 nm pore radius and an effective membrane porosity of 0.05 shows good agreement with experimental data. Charge screening becomes more dominant with increasing ionic strength and this contribution is readily incorporated into the model. The study extends our understanding of the transport mechanism of boric acid and borate ions which can assist in predicting the performance of polyamide reverse osmosis membranes. It also raises questions as to the true mechanism of transport through such a membrane.

Item Type: Article
Subjects : Chemical and Process Engineering
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
Kezia, K
Hill, AJ
Kentish, SE
Date : 15 October 2013
DOI : 10.1016/j.memsci.2013.05.041
Copyright Disclaimer : Copyright © 2013 Elsevier B.V.
Uncontrolled Keywords : Science & Technology, Technology, Physical Sciences, Engineering, Chemical, Polymer Science, Engineering, ENGINEERING, CHEMICAL, POLYMER SCIENCE, Nernst-Planck, Donnan potential, Reverse osmosis, Boron, Surface charge density, ATOMIC-FORCE MICROSCOPY, PARTIAL MOLAR VOLUMES, NANOFILTRATION MEMBRANES, AQUEOUS-SOLUTIONS, POLYAMIDE MEMBRANES, BORATE ION, REJECTION, SEAWATER, REMOVAL, MODEL
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Additional Information : Item not available from this repository
Depositing User : Symplectic Elements
Date Deposited : 19 Jul 2016 14:52
Last Modified : 30 Jul 2020 16:27

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