Boron removal from seawater using high rejection SWRO membranes - impact of pH, feed concentration, pressure, and cross-flow velocity

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dc.contributor.authorKoseoglu H.
dc.contributor.authorKabay N.
dc.contributor.authorYüksel M.
dc.contributor.authorSarp S.
dc.contributor.authorArar Ö.
dc.contributor.authorKitis M.
dc.date.accessioned2019-10-26T23:57:01Z
dc.date.available2019-10-26T23:57:01Z
dc.date.issued2008
dc.departmentEge Üniversitesien_US
dc.description.abstractThe main objective of this work was to investigate boron removal from seawater using two commercial high rejection SWRO membranes. The impact of solution pH, feed concentration, pressure, and cross-flow velocity on boron rejection and permeate flux was determined. The membranes used were the Toray™ UTC-80-AB and Filmtec™ SW30HR. A lab-scale cross-flow flat-sheet configuration test unit was used for all RO experiments. Seawater sample was collected from the Mediterranean Sea, Alanya-Ki{dotless}zi{dotless}lot shores, south Turkey. For all experiments, mass balances were between 91% and 107%, suggesting relatively low loss of boron on membrane surfaces during 14 h of operation. Operation modes did not have any impact on boron rejection, indicating that boron rejection were independent of feedwater boron concentrations up to 6.6 mg/L. For both membranes, much higher boron rejection were obtained at pH of 10.5 (>98%) than those at original seawater pH of 8.2 (about 85-90%). Permeate boron concentrations less than 0.1 mg/L were easily achieved at pH 10.5 by both membranes. The dissociated boron species are dominant at this pH, thus both electrostatic repulsion and size exclusion mechanisms are responsible for the higher boron rejection. The rejection of salts in seawater did not correlate with boron rejection at constant conditions. For each membrane type, permeate fluxes at constant pressure were generally lower at pH of 10.5, which may be partially explained by membrane fouling and enhanced scale formation by Mg and Ca compounds from concentration polarization effect at higher pH values. While somewhat higher boron rejection was found for one membrane type as the pressure was increased from 600 to 800 psi, increasing pressure did not affect boron rejection for the other membrane. Feed flowrate thus the cross-flow velocity (0.5-1.0 m/s) did not exert any significant impact on boron rejection at constant conditions. © 2008.en_US
dc.description.sponsorship04-AS-004en_US
dc.description.sponsorshipThe financial support of the Middle East Desalination Research Center (MEDRC) (Project Number: 04-AS-004) for this work is well acknowledged. The authors thank Toray Industries, Inc. and the Dow Chemical Company (FilmTec) for providing the membrane samples. --en_US
dc.identifier.doi10.1016/j.desal.2007.06.029
dc.identifier.endpage263en_US
dc.identifier.issn0011-9164
dc.identifier.issn0011-9164en_US
dc.identifier.issue01.Maren_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage253en_US
dc.identifier.urihttps://doi.org/10.1016/j.desal.2007.06.029
dc.identifier.urihttps://hdl.handle.net/11454/20927
dc.identifier.volume227en_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.relation.ispartofDesalinationen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectBoronen_US
dc.subjectDesalinationen_US
dc.subjectMembraneen_US
dc.subjectReverse osmosisen_US
dc.subjectSeawateren_US
dc.subjectSWROen_US
dc.titleBoron removal from seawater using high rejection SWRO membranes - impact of pH, feed concentration, pressure, and cross-flow velocityen_US
dc.typeArticleen_US

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