Chemical cleaning protocols for thin film composite (TFC) polyamide forward osmosis membranes used for municipal wastewater treatment

Wang, Zhiwei; Tang, Jixu; Zhu, Chaowei; Dong, Ying; Wang, Qiaoying; Wu, Zhichao

doi:10.1016/j.memsci.2014.10.032

Cited by 106 publications

(54 citation statements)

References 43 publications

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“…When the membrane modified with aquaporin proteins is cleaned, the water flux increases 75% compared to the baseline test, which could suggest that the proteins are being affected by the cleaning agent. It should be noted that Alconox detergent can cause the enlargement of pore size in polysulfone support of a TFC FO membrane after a long-term (144 hours) exposure which resulted in an increase of FO flux [34]. The negligible effect on the water flux of unmodified TFC FO membrane in the present study could be attributed to the short exposure time.…”

Section: Figurementioning

confidence: 55%

Aquaporin based biomimetic membrane in forward osmosis: Chemical cleaning resistance and practical operation

Linares

Bucs

et al. 2017

Desalination

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CitationLi Z, Valladares Linares R, Bucs S, Fortunato L, Hélix-Nielsen C, et al. (2017) Aquaporin based biomimetic membrane in forward osmosis: Chemical cleaning resistance and practical operation. Desalination 420: 208-215. Available: http://dx. AbstractAquaporin plays a promising role to prepare a high performance biomimetic forward osmosis membrane. However, aquaporin as a protein also has a risk of denaturation caused by various chemicals, resulting in a possible decay of membrane performance. The present study tested a novel aquaporin biomimetic membrane in simulated membrane cleaning processes. The effects of cleaning detergents on water flux and salt rejection were evaluated. The membrane showed a good resistance to chemical detergents tested. The water flux after chemical cleaning showed significant increases, particularly after cleaning with NaOCl and Alconox. Changes in the membrane structure and increased hydrophilicity in the surrounding areas of the aquaporin protein channel may be accountable for the increase in water permeability. The membrane shows stable salt rejection up to 99% after all cleaning solutions were used. A 15-day experiment with secondary wastewater effluent as the feed and seawater as the draw solution showed a stable flux and high salt rejection. The average total organic carbon rejection from wastewater after 15-day test was 90%. The results demonstrated that the aquaporin based biomimetic forward osmosis membrane exhibits chemical resistance for most common detergents used in membrane cleaning procedures, maintaining a stable flux and high salt rejection.

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Section: Figurementioning

confidence: 55%

Aquaporin based biomimetic membrane in forward osmosis: Chemical cleaning resistance and practical operation

Linares

Bucs

et al. 2017

Desalination

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“…Similar ATR-FTIR spectra were also observed for the exposed membranes (both Exp 3m and Exp 7m samples), which indicated that biodegradation occurred in some points of the CTA surface did not completely modify functional groups of the membrane active layer. Wang et al [45] also reported that no clear changes in the FO membrane active layer were observed from FTIR spectra, although the membrane water and solute permeability was increased after exposure to chemical cleaning reagents. They attributed the changes in membrane transport parameters to the reaction between chemical agents and polymeric materials in the inner structure of FO membranes based on the confocal laser scanning microscope imaging.…”

Section: Membrane Chemical Propertiesmentioning

confidence: 99%

Biodegradation of cellulose triacetate and polyamide forward osmosis membranes in an activated sludge bioreactor: Observations and implications

Luo

Xie

Hai

et al. 2016

Journal of Membrane Science

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. Biodegradation of cellulose triacetate and polyamide forward osmosis membranes in an activated sludge bioreactor: observations and implications. Journal of Membrane Science, 510 284-292. Biodegradation of cellulose triacetate and polyamide forward osmosis membranes in an activated sludge bioreactor: observations and implications AbstractThis study investigated long-term stability of forward osmosis (FO) membranes against biodegradation during prolonged exposure to activated sludge. Results show that cellulose triacetate (CTA) membranes were more resistant against biodegradation than polyamide thin film composite (TFC) ones. Nevertheless, CTA membrane biodegradation was discernible after seven months of exposure to activated sludge as manifested by an increase in the membrane average pore size, water and salt permeability, and membrane structural parameter. Asaresult, of prolonged exposure to activated sludge, the water and reverse salt fluxes of the CTA membrane increased; and concomitantly the rejection of a range of trace organic contaminants decreased significantly. The impact of prolonged exposure to activated sludge on the polyamide active layer of TFC FO membranes was even more severe. Our results indicate that currently available commercial CTA and polyamide TFC FO membranes may not be readily compatible for practical osmotic membrane bioreactor (OMBR) operation. Thus, the development of new and robust FO membrane materials specifically designed for membrane bioreactor operation is essential for commercial OMBR applications. Disciplines Engineering | Science and Technology Studies

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“…The possibility of wastewater reuse instead of disposing it has received increasing attention over the past decades as a viable solution towards minimizing the effect of water scarcity. Past studies have provided a baseline information that wastewater, brackish water, and seawater have great potential to augment shortage water supply, however; the energy expenditure and equipment required for purification of such water streams has limited their potential in many parts of the world [2,5]. The reuse of wastewater for other applications rather than drinking purpose is already established and examples include the irrigation of golf courses or industrial cooling [6].…”

Section: Introductionmentioning

confidence: 99%

Forward Osmosis as a Pre-Treatment Step for Seawater Dilution and Wastewater Reclamation

Motsa¹,

Mamba²

2018

Osmotically Driven Membrane Processes - Approach, Development and Current Status

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This chapter presents the exploration of the combined process of wastewater reclamation and seawater dilution using forward osmosis (FO). Wastewater and seawater are the two most abundant water sources that are free of the hydrological cycle and could serve as an alternative potable water source. Forward osmosis was chosen as the an ideal pre-treatment step to dilute seawater prior to desalination at relatively lower energy demand and low fouling propensity. Membrane fouling behavior was studied and investigated using different feed compositions bearing fractions of effluent organic matter (EfOM). The negative surface charge of all organic foulants was reduced by the adsorption of calcium ions. Filtration of feed streams containing single, simple organic foulants revealed that alginate (polysaccharides) and bovine serum albumin (BSA) resulted in significant loss in process performance as a result of permeate flux reduction.The complex mixture of alginate, BSA and humic acid caused severe loss in membrane performance due to dominant favorable synergistic interactions between foulants and between foulants and membrane surface. The forward osmosis process presents a viable alternative for a simple and effective seawater dilution step using wastewater as the feed solution. Process performance can be improved by selecting a foulant resistant membrane with matching flux.

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Chemical cleaning protocols for thin film composite (TFC) polyamide forward osmosis membranes used for municipal wastewater treatment

Cited by 106 publications

References 43 publications

Aquaporin based biomimetic membrane in forward osmosis: Chemical cleaning resistance and practical operation

Aquaporin based biomimetic membrane in forward osmosis: Chemical cleaning resistance and practical operation

Biodegradation of cellulose triacetate and polyamide forward osmosis membranes in an activated sludge bioreactor: Observations and implications

Forward Osmosis as a Pre-Treatment Step for Seawater Dilution and Wastewater Reclamation

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