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dc.contributor.authorWaly, Tarek
dc.contributor.authorKennedy, Maria Dolores
dc.contributor.authorWitkamp, Geert-Jan
dc.contributor.authorAmy, Gary L.
dc.contributor.authorSchippers, Jan Cornelis
dc.date.accessioned2015-08-03T09:33:27Z
dc.date.available2015-08-03T09:33:27Z
dc.date.issued2011-10
dc.identifier.citationWaly, T., Kennedy, M. D., Witkamp, G.-J., Amy, G., & Schippers, J. C. (2011). Predicting and measurement of pH of seawater reverse osmosis concentrates. Desalination, 280(1-3), 27–32. doi:10.1016/j.desal.2011.06.057
dc.identifier.issn00119164
dc.identifier.doi10.1016/j.desal.2011.06.057
dc.identifier.urihttp://hdl.handle.net/10754/561891
dc.description.abstractThe pH of seawater reverse osmosis plants (SWRO) is the most influential parameter in determining the degree of supersaturation of CaCO3 in the concentrate stream. For this, the results of pH measurements of the concentrate of a seawater reverse osmosis pilot plant were compared with pH calculations based on the CO2-HCO3 --CO3 2- system equilibrium equations. Results were compared with two commercial software programs from membrane suppliers and also the software package Phreeqc. Results suggest that the real concentrate pH is lower than that of the feed and that none of the used programs was able to predict correctly real pH values. In addition, the effect of incorporating the acidity constant calculated for NaCl medium or seawater medium showed a great influence on the concentrate pH determination. The HCO3 - and CO3 2- equilibrium equation using acidity constants developed for seawater medium was the only method able to predict correctly the concentrate pH. The outcome of this study indicated that the saturation level of the concentrate was lower than previously anticipated. This was confirmed by shutting down the acid and the antiscalants dosing without any signs of scaling over a period of 12 months. © 2011 Elsevier B.V.
dc.publisherElsevier BV
dc.subjectDesalination
dc.subjectEquilibrium equations
dc.subjectMembranes
dc.subjectModelling
dc.subjectScaling
dc.titlePredicting and measurement of pH of seawater reverse osmosis concentrates
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalDesalination
dc.contributor.institutionUNESCO-IHE, Delft, Netherlands
dc.contributor.institutionTUDelft, Delft, Netherlands
kaust.personAmy, Gary L.


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