Effect of membrane fouling on transport of organic contaminants in NF/RO membrane applications

Xu, Pei; Drewes, Jörg E.; Kim, Tae-Uk; Bellona, Christopher; Amy, Gary L.

doi:10.1016/j.memsci.2005.12.001

Cited by 402 publications

(228 citation statements)

References 34 publications

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“…High rejection of the hydrophilic nonionic TOrCs (acetaminophen, caffeine, acesulfame, TCEP, TCPP, and TDCP) by the SW30 RO membrane compared to the CTA FO membrane may be due to the higher selectivity of the SW30 RO polyamide active layer. 81 The rejection of the nonionic hydrophobic compounds with low molecular weight (DEET and bisphenol A) was the lowest for the FO and RO membranes; however, the RO membrane rejection was approximately three times greater for DEET and 30% greater for bisphenol A compared to the FO membrane. This result differs from those reported by Hancock et al 19 in which DEET and bisphenol A were better rejected by the CTA FO membrane than the SW30 RO membrane.…”

Section: Methodsmentioning

confidence: 93%

“…The chemical and physical properties of the fouling layer affect convective and diffusive transport of TOrCs through the membrane in both FO and RO mode; therefore, the difference in results of the current study and previous works may be associated with properties of the fouling layer. 18,81 The total UFO-MBR system removal was calculated using the influent and RO permeate concentrations. The removal included degradation in the anoxic and aerobic bioreactors and rejection by the FO and RO membranes.…”

Section: Methodsmentioning

confidence: 99%

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Removal of Trace Organic Chemicals and Performance of a Novel Hybrid Ultrafiltration-Osmotic Membrane Bioreactor

Holloway

Regnery

Nghiem

et al. 2014

Environ. Sci. Technol.

130

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A hybrid ultrafiltration-osmotic membrane bioreactor (UFO-MBR) was investigated for over 35 days for nutrient and trace organic chemical (TOrC) removal from municipal wastewater. The UFO-MBR system uses both ultrafiltration (UF) and forward osmosis (FO) membranes in parallel to simultaneously extract clean water from an activated sludge reactor for nonpotable (or environmental discharge) and potable reuse, respectively. In the FO stream, water is drawn by osmosis from activated sludge through an FO membrane into a draw solution (DS), which becomes diluted during the process. A reverse osmosis (RO) system is then used to reconcentrate the diluted DS and produce clean water suitable for direct potable reuse. The UF membrane extracts water, dissolved salts, and some nutrients from the system to prevent their accumulation in the activated sludge of the osmotic MBR. The UF permeate can be used for nonpotable reuse purposes (e.g., irrigation and toilet flushing). Results from UFO-MBR investigation illustrated that the chemical oxygen demand, total nitrogen, and total phosphorus removals were greater than 99%, 82%, and 99%, respectively. Twenty TOrCs were detected in the municipal wastewater that was used as feed to the UFO-MBR system. Among these 20 TOrCs, 15 were removed by the hybrid UFO-MBR system to below the detection limit. High FO membrane rejection was observed for all ionic and nonionic hydrophilic TOrCs and lower rejection was observed for nonionic hydrophobic TOrCs. With the exceptions of bisphenol A and DEET, all TOrCs that were detected in the DS were well rejected by the RO membrane. Overall, the UFO-MBR can operate sustainably and has the potential to be utilized for direct potable reuse applications.

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Section: Methodsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Removal of Trace Organic Chemicals and Performance of a Novel Hybrid Ultrafiltration-Osmotic Membrane Bioreactor

Holloway

Regnery

Nghiem

et al. 2014

Environ. Sci. Technol.

130

View full text Add to dashboard Cite

show abstract

“…a higher concentration of these molecules compared to their concentration in the bulk feed. Furthermore, in most cases, membrane fouling by natural organic matter, polysaccharides and inorganic material will occur, which can change substantially the membrane surface properties such as hydrophobicity [107], roughness [108] and surface charge [109]. Several membrane autopsies carried out on NF and RO membranes have showed the fouling layer to be composed of different materials [110][111][112][113], caused by the different water quality treated.…”

Section: Conditioning Layersmentioning

confidence: 99%

The role of cell-surface interactions in bacterial initial adhesion and consequent biofilm formation on nanofiltration/reverse osmosis membranes

Habimana

Semiao

Casey

2014

Journal of Membrane Science

226

113

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“…estrone at pH>10.3). When this occurs, charge repulsion between the membrane surface charge and the dissociated compound occur enhancing the retention of the xenobiotic [136,63,64,93,94,144,95,145,80]. This effect is especially pronounced with molecules smaller than the pore size of the membrane.…”

Section: Charge Repulsionmentioning

confidence: 99%

“…Fouling by NOM modifies the membrane surface and pore properties and affects the retention of small compounds [103,145] especially for NF membranes when compared to RO [28]. NOM can block the membrane pores or change the membrane surface properties enhancing contaminant removal by steric exclusion and charge repulsion [106,51,56,69,90,28,80,89,97].…”

Section: Membrane Fouling Increases Xenobiotics Retentionmentioning

confidence: 99%

Xenobiotics Removal by Membrane Technology: An Overview

Semiao

Schäfer

2009

Xenobiotics in the Urban Water Cycle

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Small molecular weight xenobiotics are compounds of extreme concern in potable water applications due to their adverse human health and environmental effects. However, conventional water treatment processes cannot fully and systematically remove them due to their low concentrations in natural waters and wastewaters. Biological limitation to degrade such compounds is another cause for inefficient removal.Physical barriers like membranes possessing pore sizes smaller than the compounds to be removed emerged as a good solution. Nanofiltration and reverse osmosis proved to be quite effective for xenobiotics removal in potable water production in the Paris purification plant of Méry-sur-Oise. However, even these very narrow pore membrane processes may result in incomplete removal: xenobiotics retention is high but factors such as adsorption, size exclusion and charge repulsion affect unpredictably their retention. The water solutions complexity to be treated renders xenobiotics removal predictions even more difficult due to interactions between xenobiotics and compounds in water.Removal of xenobiotics by microfiltration and ultrafiltration is very low because adsorption on the membrane is the main retention mechanism. Combining those with other processes (e.g. activated carbon) can considerably improve xenobiotics removal.The least studied processes in xenobiotics removal are electrodialysis, membrane distillation and pervaporation. Electrodialysis removal of organic xenobiotics shows a breakthrough through the membrane possibly due to adsorption followed by diffusion. Membrane distillation presents high removal rates of xenobiotics due to the compounds low vapour pressure. For volatile organic xenobiotics or solutions of trace amounts both membrane distillation and pervaporation can be used, xenobiotics interaction with the membrane being the key factor.In this book chapter a thorough synopsis of current knowledge on xenobiotics removal is presented and balanced with recent fundamental studies of underlying mechanisms, informing both the practitioner regarding membrane capabilities for xenobiotics removal and the researcher with the current state-of-art.

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Effect of membrane fouling on transport of organic contaminants in NF/RO membrane applications

Cited by 402 publications

References 34 publications

Removal of Trace Organic Chemicals and Performance of a Novel Hybrid Ultrafiltration-Osmotic Membrane Bioreactor

Removal of Trace Organic Chemicals and Performance of a Novel Hybrid Ultrafiltration-Osmotic Membrane Bioreactor

The role of cell-surface interactions in bacterial initial adhesion and consequent biofilm formation on nanofiltration/reverse osmosis membranes

Xenobiotics Removal by Membrane Technology: An Overview

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