Ceramic membrane as a pretreatment for reverse osmosis: Interaction between marine organic matter and metal oxides

Handle URI:
http://hdl.handle.net/10754/562640
Title:
Ceramic membrane as a pretreatment for reverse osmosis: Interaction between marine organic matter and metal oxides
Authors:
Dramas, Laure ( 0000-0002-8883-2084 ) ; Croue, Jean-Philippe
Abstract:
Scaling and (bio)fouling phenomena can severely alter the performance of the reverse osmosis process during desalination of seawater. Pretreatments must be applied to efficiently remove particles, colloids, and also precursors of the organic fouling and biofouling. Ceramic membranes offer a lot of advantages for micro and ultrafiltration pretreatments because their initial properties can be recovered using more severe cleaning procedure. The study focuses on the interaction between metal oxides and marine organic matter. Experiments were performed at laboratory scale. The first series of experiments focus on the filtration of different fractions of natural organic matter and model compounds solutions on flat disk ceramic membranes (47 mm of diameter) characterized with different pore size and composition. Direct filtration experiments were conducted at 0.7 bar or 2 bars and at room temperature (20 ± 0.5 °C). The efficiency of backflush and alkaline cleaning were eval, and titanium oxides. Each metal oxide corresponds to a specific pore size for the disk ceramic membranes: 80, 60, and 30 nm. Different sizes of metal oxide particles are used to measure the impact of the surface area on the adsorption of the organic matter. Seawaters from the Arabian Gulf and from the Red Sea were collected during algal blooms. Cultures of algae were also performed in the laboratory and in cooperation with woods hole oceanographic institute. Solutions of algal exudates were obtained after a couple of weeks of cultivation followed by sonication. Solutions were successively filtered through GFF (0.7 lm) and 0.45 lm membrane filters before use. The dissolved organic carbon (DOC) concentration of final solution was between 1 and 4 mg/L and showed strong hydrophilic character. These various solutions were prepared with the objective to mimic the dissolved organic matter composition of seawater subjected to algal bloom. Characterization of the solutions of filtration experiments (feed water, permeate water, and back-washes) and batch experiments (raw solution and supernatant solutions) included fluorescence, UV, total organic carbon, total nitrogen, and Liquid Chromatography - Organic Carbon Detection measurements. In comparison to seawater under normal condition, seawa- ters collected during algal bloom and algal exudates solutions led to very severe fouling of all ceramic membranes (with some DOC removal of 10-20%). It is important to indicate that algal exudate permeates still exert fouling properties when filtered through similar new (virgin) membrane. These results indicate that both size exclusion and adsorption phenomena occur (on surface, inside pores). In all cases, the backflush (performed with MilliQ [MQ]) showed minor or no effect and the cleaning backwash was not able to recover the initial flux (30-60%). Analyses performed on the backflush solution (performed with MQ) and on the alkaline cleaning solution revealed the retention of both high and low molecular organics on the different metal oxides. Unfortunately, analyses of membrane surface using imaging various tools are not providing informative results in term of foulant/adsorbed material composition. © 2013 Desalination Publications. All rights reserved.
KAUST Department:
Environmental Science and Engineering Program; Biological and Environmental Sciences and Engineering (BESE) Division
Publisher:
Taylor & Francis
Journal:
Desalination and Water Treatment
Issue Date:
Feb-2013
DOI:
10.1080/19443994.2012.714728
Type:
Article
ISSN:
19443994
Appears in Collections:
Articles; Environmental Science and Engineering Program; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorDramas, Laureen
dc.contributor.authorCroue, Jean-Philippeen
dc.date.accessioned2015-08-03T10:59:23Zen
dc.date.available2015-08-03T10:59:23Zen
dc.date.issued2013-02en
dc.identifier.issn19443994en
dc.identifier.doi10.1080/19443994.2012.714728en
dc.identifier.urihttp://hdl.handle.net/10754/562640en
dc.description.abstractScaling and (bio)fouling phenomena can severely alter the performance of the reverse osmosis process during desalination of seawater. Pretreatments must be applied to efficiently remove particles, colloids, and also precursors of the organic fouling and biofouling. Ceramic membranes offer a lot of advantages for micro and ultrafiltration pretreatments because their initial properties can be recovered using more severe cleaning procedure. The study focuses on the interaction between metal oxides and marine organic matter. Experiments were performed at laboratory scale. The first series of experiments focus on the filtration of different fractions of natural organic matter and model compounds solutions on flat disk ceramic membranes (47 mm of diameter) characterized with different pore size and composition. Direct filtration experiments were conducted at 0.7 bar or 2 bars and at room temperature (20 ± 0.5 °C). The efficiency of backflush and alkaline cleaning were eval, and titanium oxides. Each metal oxide corresponds to a specific pore size for the disk ceramic membranes: 80, 60, and 30 nm. Different sizes of metal oxide particles are used to measure the impact of the surface area on the adsorption of the organic matter. Seawaters from the Arabian Gulf and from the Red Sea were collected during algal blooms. Cultures of algae were also performed in the laboratory and in cooperation with woods hole oceanographic institute. Solutions of algal exudates were obtained after a couple of weeks of cultivation followed by sonication. Solutions were successively filtered through GFF (0.7 lm) and 0.45 lm membrane filters before use. The dissolved organic carbon (DOC) concentration of final solution was between 1 and 4 mg/L and showed strong hydrophilic character. These various solutions were prepared with the objective to mimic the dissolved organic matter composition of seawater subjected to algal bloom. Characterization of the solutions of filtration experiments (feed water, permeate water, and back-washes) and batch experiments (raw solution and supernatant solutions) included fluorescence, UV, total organic carbon, total nitrogen, and Liquid Chromatography - Organic Carbon Detection measurements. In comparison to seawater under normal condition, seawa- ters collected during algal bloom and algal exudates solutions led to very severe fouling of all ceramic membranes (with some DOC removal of 10-20%). It is important to indicate that algal exudate permeates still exert fouling properties when filtered through similar new (virgin) membrane. These results indicate that both size exclusion and adsorption phenomena occur (on surface, inside pores). In all cases, the backflush (performed with MilliQ [MQ]) showed minor or no effect and the cleaning backwash was not able to recover the initial flux (30-60%). Analyses performed on the backflush solution (performed with MQ) and on the alkaline cleaning solution revealed the retention of both high and low molecular organics on the different metal oxides. Unfortunately, analyses of membrane surface using imaging various tools are not providing informative results in term of foulant/adsorbed material composition. © 2013 Desalination Publications. All rights reserved.en
dc.publisherTaylor & Francisen
dc.subjectAdsorptionen
dc.subjectCeramic membraneen
dc.subjectMarine organic matteren
dc.subjectMetal oxideen
dc.titleCeramic membrane as a pretreatment for reverse osmosis: Interaction between marine organic matter and metal oxidesen
dc.typeArticleen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalDesalination and Water Treatmenten
kaust.authorDramas, Laureen
kaust.authorCroue, Jean-Philippeen
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