Changes in Physicochemical and Transport Properties of a Reverse Osmosis Membrane Exposed to Chloraminated Seawater

This study contributed to improving our understanding of how disinfectants, applied to control biofouling of reverse osmosis (RO) membranes, result in membrane performance degradation. We investigated changes in physicochemical properties and permeation performance of a RO membrane with fully aromat...

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Veröffentlicht in:	Environmental science & technology 2015-02, Vol.49 (4), p.2301-2309
Hauptverfasser:	Valentino, Lauren, Renkens, Tennie, Maugin, Thomas, Croué, Jean-Philippe, Mariñas, Benito J
Format:	Artikel
Sprache:	eng
Schlagworte:	Biofouling Bromides - chemistry Chloramines Experiments Filtration - methods Iodides - chemistry Kinetics Marine Membranes Membranes, Artificial Nylons - chemistry Osmosis Permeability Scientific imaging Seawater Seawater - chemistry Spectroscopy, Fourier Transform Infrared Spectrum Analysis Water Purification - instrumentation Water Purification - methods
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container_title	Environmental science & technology
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creator	Valentino, Lauren Renkens, Tennie Maugin, Thomas Croué, Jean-Philippe Mariñas, Benito J
description	This study contributed to improving our understanding of how disinfectants, applied to control biofouling of reverse osmosis (RO) membranes, result in membrane performance degradation. We investigated changes in physicochemical properties and permeation performance of a RO membrane with fully aromatic polyamide (PA) active layer. Membrane samples were exposed to varying concentrations of monochloramine, bromide, and iodide in both synthetic and natural seawater. Elemental analysis of the membrane active layer by Rutherford backscattering spectrometry (RBS) revealed the incorporation of bromine and iodine into the polyamide. The kinetics of polyamide bromination were first order with respect to the concentration of the secondary oxidizing agent Br2 for the conditions investigated. Halogenated membranes were characterized after treatment with a reducing agent and heavy ion probes to reveal the occurrence of irreversible ring halogenation and an increase in carboxylic groups, the latter produced as a result of amide bond cleavage. Finally, permeation experiments revealed increases in both water permeability and salt passage as a result of oxidative damage.
doi_str_mv	10.1021/es504495j
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Sci. Technol</addtitle><description>This study contributed to improving our understanding of how disinfectants, applied to control biofouling of reverse osmosis (RO) membranes, result in membrane performance degradation. We investigated changes in physicochemical properties and permeation performance of a RO membrane with fully aromatic polyamide (PA) active layer. Membrane samples were exposed to varying concentrations of monochloramine, bromide, and iodide in both synthetic and natural seawater. Elemental analysis of the membrane active layer by Rutherford backscattering spectrometry (RBS) revealed the incorporation of bromine and iodine into the polyamide. The kinetics of polyamide bromination were first order with respect to the concentration of the secondary oxidizing agent Br2 for the conditions investigated. 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subjects	Biofouling Bromides - chemistry Chloramines Experiments Filtration - methods Iodides - chemistry Kinetics Marine Membranes Membranes, Artificial Nylons - chemistry Osmosis Permeability Scientific imaging Seawater Seawater - chemistry Spectroscopy, Fourier Transform Infrared Spectrum Analysis Water Purification - instrumentation Water Purification - methods
title	Changes in Physicochemical and Transport Properties of a Reverse Osmosis Membrane Exposed to Chloraminated Seawater
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