Predicting and measurement of pH of seawater reverse osmosis concentrates

Handle URI:
http://hdl.handle.net/10754/561891
Title:
Predicting and measurement of pH of seawater reverse osmosis concentrates
Authors:
Waly, Tarek; Kennedy, Maria Dolores; Witkamp, Geert-Jan; Amy, Gary L.; Schippers, Jan Cornelis
Abstract:
The 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.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division
Publisher:
Elsevier
Journal:
Desalination
Issue Date:
Oct-2011
DOI:
10.1016/j.desal.2011.06.057
Type:
Article
ISSN:
00119164
Appears in Collections:
Articles; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorWaly, Tareken
dc.contributor.authorKennedy, Maria Doloresen
dc.contributor.authorWitkamp, Geert-Janen
dc.contributor.authorAmy, Gary L.en
dc.contributor.authorSchippers, Jan Cornelisen
dc.date.accessioned2015-08-03T09:33:27Zen
dc.date.available2015-08-03T09:33:27Zen
dc.date.issued2011-10en
dc.identifier.issn00119164en
dc.identifier.doi10.1016/j.desal.2011.06.057en
dc.identifier.urihttp://hdl.handle.net/10754/561891en
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.en
dc.publisherElsevieren
dc.subjectDesalinationen
dc.subjectEquilibrium equationsen
dc.subjectMembranesen
dc.subjectModellingen
dc.subjectScalingen
dc.titlePredicting and measurement of pH of seawater reverse osmosis concentratesen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalDesalinationen
dc.contributor.institutionUNESCO-IHE, Delft, Netherlandsen
dc.contributor.institutionTUDelft, Delft, Netherlandsen
kaust.authorAmy, Gary L.en
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