Characterization and performance of a commercial thin film nanocomposite seawater reverse osmosis membrane and comparison with a thin film composite

Hofs, B.; Schurer, R.; Harmsen, D.J.H.; Ceccarelli, C.; Beerendonk, E.F.; Cornelissen, Emile

doi:10.1016/j.memsci.2013.06.007

Cited by 41 publications

(21 citation statements)

References 38 publications

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“…Because of its small molecular size and uncharged property, NDMA readily permeates through an RO membrane. Brackish water RO membranes are typically able to achieve 40-70% rejection of NDMA at lab-scale levels (Bellona et al, 2011;Fujioka et al, 2012b;Hofs et al, 2013;Miyashita et al, 2009;Steinle-Darling et al, 2007) and at 5-80% at pilot-to full-scale levels (Bellona et al, 2008;Farré et al, 2011a;Fujioka et al, 2013b;Plumlee et al, 2008;Poussade et al, 2009). Any improvement to the selectivity of RO membranes and assignment of removal credits for NDMA can improve the safety of recycled water and possibly reduce the load on any UV or UV/AOP.…”

Section: Introductionmentioning

confidence: 99%

High rejection reverse osmosis membrane for removal of N-nitrosamines and their precursors

et al. 2018

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Direct potable reuse is becoming a feasible option to cope with water shortages. It requires more stringent water quality assurance than indirect potable reuse. Thus, the development of a high-rejection reverse osmosis (RO) membrane for the removal of one of the most challenging chemicals in potable reuse - N-nitrosodimethylamine (NDMA) - ensures further system confidence in reclaimed water quality. This study aimed to achieve over 90% removal of NDMA by modifying three commercial and one prototype RO membrane using heat treatment. Application of heat treatment to a prototype membrane resulted in a record high removal of 92% (1.1-log) of NDMA. Heat treatment reduced conductivity rejection and permeability, while secondary amines, selected as N-nitrosamine precursors, were still well rejected (>98%) regardless of RO membrane type. This study also demonstrated the highly stable separation performance of the heat-treated prototype membrane under conditions of varying feed temperature and permeate flux. Fouling propensity of the prototype membrane was lower than a commercial RO membrane. This study identified a need to develop highly selective RO membranes with high permeability to ensure the feasibility of using these membranes at full scale.

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Section: Introductionmentioning

confidence: 99%

High rejection reverse osmosis membrane for removal of N-nitrosamines and their precursors

et al. 2018

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“…However, the values for SW30XLE and BW30XFR were lower [36]. We attribute this to the reduction of free volume in the membrane active layer due aging that is known to occur [37,38]. These polyamide layers are non-equilibrium materials in a glassy state.…”

Section: Resultsmentioning

confidence: 99%

Effect of Short-Term Contact with C1–C4 Monohydric Alcohols on the Water Permeance of MPD-TMC Thin-Film Composite Reverse Osmosis Membranes

et al. 2019

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In this paper, we discuss the effect of alcohol contact on the transport properties of thin-film composite reverse osmosis membranes. Five commercial membranes were studied to quantify the changes in water permeance and sodium chloride rejection from contact with five C1–C4 monohydric, linear alcohols. Water permeance generally increased without decreasing rejection after short-term contact. The extent of these changes depends on the membrane and alcohol used. Young′s modulus measurements showed decreased stiffness of the active layer after contacting the membranes with alcohol, suggesting plasticization. Data analysis using a dual-mode sorption model identified positive correlations of the initial water permeance, as well as the change in free energy of mixing between water and the alcohols, with the increase in water permeance after alcohol contact. We suggest that the mixing of water with the alcohols facilitates alcohol penetration into the active layer, likely by disrupting inter-chain hydrogen bonds, thus increasing the free volume for water permeation. Our studies provide a modeling framework to estimate the changes in transport properties after short-term contact with C1–C4 alcohols.

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“…Experimentally, two sets of commercially available membranes were investigated, namely, a thin-film nanocomposite membrane (NanoH 2 O), with inorganic nanoparticles incorporated in the selective layer [ 60 ], and the asymmetric Porifera membrane [ 61 , 62 ]. The main objective of these experiments was twofold.…”

Section: Introductionmentioning

confidence: 99%

The Need for Accurate Osmotic Pressure and Mass Transfer Resistances in Modeling Osmotically Driven Membrane Processes

et al. 2021

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The widely used van ’t Hoff linear relation for predicting the osmotic pressure of NaCl solutions may result in errors in the evaluation of key system parameters, which depend on osmotic pressure, in pressure-retarded osmosis and forward osmosis. In this paper, the linear van ’t Hoff approach is compared to the solutions using OLI Stream Analyzer, which gives the real osmotic pressure values. Various dilutions of NaCl solutions, including the lower solute concentrations typical of river water, are considered. Our results indicate that the disparity in the predicted osmotic pressure of the two considered methods can reach 30%, depending on the solute concentration, while that in the predicted power density can exceed over 50%. New experimental results are obtained for NanoH2O and Porifera membranes, and theoretical equations are also developed. Results show that discrepancies arise when using the van ’t Hoff equation, compared to the OLI method. At higher NaCl concentrations (C > 1.5 M), the deviation between the linear approach and the real values increases gradually, likely indicative of a larger error in van ’t Hoff predictions. The difference in structural parameter values predicted by the two evaluation methods is also significant; it can exceed the typical 50–70% range, depending on the operating conditions. We find that the external mass transfer coefficients should be considered in the evaluation of the structural parameter in order to avoid overestimating its value. Consequently, measured water flux and predicted structural parameter values from our own and literature measurements are recalculated with the OLI software to account for external mass transfer coefficients.

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Characterization and performance of a commercial thin film nanocomposite seawater reverse osmosis membrane and comparison with a thin film composite

Cited by 41 publications

References 38 publications

High rejection reverse osmosis membrane for removal of N-nitrosamines and their precursors

High rejection reverse osmosis membrane for removal of N-nitrosamines and their precursors

Effect of Short-Term Contact with C1–C4 Monohydric Alcohols on the Water Permeance of MPD-TMC Thin-Film Composite Reverse Osmosis Membranes

The Need for Accurate Osmotic Pressure and Mass Transfer Resistances in Modeling Osmotically Driven Membrane Processes

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