Risk management approach for monitoring UF membrane integrity and experimental validation using MS2-phages

Brehant, A.; Glucina, K.; Moigne, Isabelle Le; Laîné, J.M.

doi:10.5004/dwt.2009.771

Cited by 12 publications

(8 citation statements)

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“…The LOD is comparable to previous results reported by our research group using pSi membrane and Si micropore array‐based electrochemical immunosensors (6 pfu mL −1 and 0.9 pfu mL −1 , respectively), but increasing the robustness and stability of the former and greatly simplifying and reducing the fabrication cost of the latter . Results can be further improved by harnessing the oriented immobilization of the antibodies used as bioreceptors as shown by our previous work on electrochemical sensing of MS2 (LOD < 2.2 pfu mL −1 using various functionalization strategies) . Successful impedimetric detection of MS2 bacteriophage highlights the potential of pSi‐based electrochemical sensor platforms as dual capture and sensing devices.…”

Section: Resultssupporting

confidence: 82%

Porous Silicon Nanostructures as Effective Faradaic Electrochemical Sensing Platforms

Guo

Sharma

Toh

et al. 2019

Adv Funct Materials

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The electrochemical performance of porous silicon (pSi) stabilized via thermal decomposition of acetylene gas is investigated for the first time. In this study, pSi undergoes two thermal treatments at either 525 or 800 °C, which result in hydrogen-terminated thermally hydrocarbonized pSi (THCpSi) and hydroxylterminated thermally carbonized pSi (TCpSi), respectively, the latter upon dipping in hydrofluoric acid to activate the surface termination. Electrochemical characterization, using cyclic voltammetry, chronocoulometry, and electrochemical impedance spectroscopy in the presence of several redox pairs, [Fe(CN) 6 ] 3/4− , [Ru(NH 3 ) 6 ] 2/3+ , and hydroquinone/quinone, is used to demonstrate the versatility and high stability to degradation of carbon-stabilized pSi nanostructures and their excellent electrochemical performance. Added to the large surface area, adjustable pore morphology and tailorable surface chemistry of THCpSi and TCpSi, these nanostructures demonstrate fast electron-transfer kinetics, providing key advantages over conventional carbon electrodes. The versatile surface chemistry of THCpSi and TCpSi offer various possibilities to introduce multiple functional groups depending on the nature of the bioreceptor to be immobilized. For proof of principle, the use of a THCpSi-based immunosensor to detect MS2 bacteriophage is demonstrated by means of electrochemical impedance spectroscopy, showing a detection limit of 4.9 pfu mL −1 . Carbon-stabilized pSi structures represent a new class of nanostructured electrodes for biosensing applications.

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Section: Resultssupporting

confidence: 82%

Porous Silicon Nanostructures as Effective Faradaic Electrochemical Sensing Platforms

Guo

Sharma

Toh

et al. 2019

Adv Funct Materials

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“…Pressure decay or diffusive air flow tests are typically carried out at pressures below the bubblepoint pressure of a non-defective membrane [23]. The upstream side of a wetted intact membrane is pressurized with air or other gases to a specific pressure and the pressure source should be isolated.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the defect size of ultrafiltration membrane system using mathematical model

et al. 2015

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“…Monitoring and control of pathogens in water treatment processes are a daunting challenge for the water industry and governmental regulators (Brehant et al, 2010;Guo et al, 2010;Kumar et al, 2007;Lozier, 2003;Mi et al, 2004;Phattaranawik et al, 2008). Of the different pathogens, waterborne viruses are especially challenging because of their small size, high mobility, and resistance to chlorination (Grabow, 2001;Pontius et al, 2009;Theng-Theng Fong, 2005).…”

Section: Introductionmentioning

confidence: 99%

New techniques for real-time monitoring of reverse osmosis membrane integrity for virus removal

Frenkel¹,

Cohen

2018

Water Practice and Technology

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This paper presents methodology, concept and results of the WateReuse Foundation project WFR – 09 – 06b when developing a high pressure membrane, reverse osmosis (RO) and nanofiltration (NF) online membrane integrity testing (MIT) technique. The use of pressure-driven membrane processes, particularly RO, has grown significantly over the past few decades in water treatment and reuse applications to safeguard water supplies against harmful pathogens and impurities. In principle, RO membranes should provide a complete physical barrier to the passage of nanosize pathogens (e.g., enteric viruses). However, in the presence of imperfections and/or membrane damage, membrane breaches as small as 20 to 30 nm can allow enteric viruses to pass through the membrane and contaminate the product water stream, thereby posing a potential health hazard that is of particular concern for potable water production. This project was focused on evaluating a pulsed-marker membrane integrity monitoring (PM-MIMo) approach for RO processes on the basis of the use of a fluorescent marker. The monitoring approach employs pulsed dosing (via a precision metering pump) of a marker into the RO feed stream coupled with online marker concentration monitoring in the RO permeate by an inline spectrofluorometer. Membrane integrity is then inferred on the basis of real-time analysis of the marker permeate time − profile concentration in response. The basic concept of the PM-MIMo approach for detecting membrane breaches was successfully demonstrated, by comparing intact and damaged membranes, in a series of experiments using a diagnostic plate-and-frame RO system and spiral-wound RO pilot system. Results of the developed technique are presented in the project report to allow the industry to consider adopting this technique for RO/NF online integrity monitoring.

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Risk management approach for monitoring UF membrane integrity and experimental validation using MS2-phages

Cited by 12 publications

References 0 publications

Porous Silicon Nanostructures as Effective Faradaic Electrochemical Sensing Platforms

Porous Silicon Nanostructures as Effective Faradaic Electrochemical Sensing Platforms

Quantification of the defect size of ultrafiltration membrane system using mathematical model

New techniques for real-time monitoring of reverse osmosis membrane integrity for virus removal

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