Biofouling and cleaning effectiveness of surface nanostructured reverse osmosis membranes

Varin, Kari J.; Lin, Nancy H.; Cohen, Yoram

doi:10.1016/j.memsci.2013.06.064

Cited by 61 publications

(18 citation statements)

References 39 publications

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“…Chemical agents could react with the foulants and as a result, the cohesion forces between foulants as well as the adhesion of foulants to membrane surface could be reduced, making foulants easy to be removed. The commonly used chemical agents include acids, bases, surfactants and chelating agents (Varin et al, 2013). Acids, such as hydrochloric acid, nitric acid and sulfuric acid are effective in removing membrane scaling (Gan et al, 1999) while alkaline solutions such as sodium hydroxide are more effective in removing organic fouling and biofouling (Al-Amoudi and Lovitt, 2007;Filloux et al, 2015).…”

Section: Membrane Cleaningmentioning

confidence: 99%

A review of reverse osmosis membrane fouling and control strategies

Jiang

Li²

2017

Science of The Total Environment

750

362

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Reverse osmosis (RO) membrane technology is one of the most important technologies for water treatment. However, membrane fouling is an inevitable issue. Membrane fouling leads to higher operating pressure, flux decline, frequent chemical cleaning and shorter membrane life. This paper reviews membrane fouling types and fouling control strategies, with a focus on the latest developments. The fundamentals of fouling are discussed in detail, including biofouling, organic fouling, inorganic fouling and colloidal fouling. Furthermore, fouling mitigation technologies are also discussed comprehensively. Pretreatment is widely used in practice to reduce the burden for the following RO operation while real time monitoring of RO has the advantage and potential of providing support for effective and efficient cleaning. Surface modification could slow down membrane fouling by changing surface properties such as surface smoothness and hydrophilicity, while novel membrane materials and synthesis processes build a promising future for the next generation of RO membranes with big advancements in fouling resistance. Especially in this review paper, statistical analysis is conducted where appropriate to reveal the research interests in RO fouling and control.Graphic Abstract

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Section: Membrane Cleaningmentioning

confidence: 99%

A review of reverse osmosis membrane fouling and control strategies

Jiang

Li²

2017

Science of The Total Environment

750

362

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“…Five chemical cleaning solutions were used independently in this study: acid cleaning with 0.1% hydrochloric acid (HCl) at a pH of 1.4, biocide cleaning with 0.5% sodium hypochlorite (NaOCl) at a pH of 11.6, chelating cleaning of 5 mM disodium ethylenediaminetetraacetic acid (EDTA) at a pH of 8.2, anionic surfactant cleaning consisting of 2 mM sodium dodecyl sulfate (SDS) at a pH of 9.1, and a commercial anionic detergent solution (Alconox) of 1% at a pH of 9.3, composed of sodium dodecylbenzenesulfonate (10-30%) commonly known as linear alkylbenzene sulfonate (LAS), sodium carbonate (7-13%), tetrasodium pyrophosphate (10-30%) and sodium phosphate (10-30%). These cleaning methods were chosen as they are the most common techniques used to clean membranes in seawater desalination and wastewater recovery processes [12][13][14][15][16].…”

Section: Fo Experimental Setupmentioning

confidence: 99%

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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“…A flat-sheet polyamide ESPA2 RO membrane (Hydranautics, Oceanside, CA), which is commonly used for RO desalination of treated wastewater [28], was used in a bench-scale RO system. The membrane has an average permeability of 4.63 LMH/bar, and an observed salt rejection of 99% (for 1,000 mg/L NaCl solution).…”

Section: Materials and Reagentsmentioning

confidence: 99%

An Integrated approach for characterization of polyamide reverse osmosis membrane degradation due to exposure to free chlorine

Surawanvijit¹,

Rahardianto²,

Cohen³

2016

Journal of Membrane Science

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Reverse osmosis (RO) polyamide (PA) membrane integrity loss, performance degradation, and alteration of surface properties due to exposure to chlorine were evaluated experimentally via a fluorescent marker (uranine) based method, water permeability and salt flux measurements, and surface characterization via XPS, AFM and contact angle measurements. Membrane exposure to chlorine (4 -200 mg/L NaOCl solutions) revealed that although membrane surface roughness increased with chlorine exposure intensity (ppm-hr), surface hydrophilicity increased as inferred by the decline (up to 5.2% -9.6%) of the surface energy of hydration. Comparative analysis of marker transport for membranes that have undergone chlorine exposure of 125 -2000 ppm-hr demonstrated that the membrane marker permeability coefficient (B) increased by up to a factor of ~5 relative to the intact membrane. While the severity of membrane integrity loss/performance degradation correlated to a reasonable degree with ppm-hr of chlorine exposure, the severity of membrane integrity loss, at the same chlorine ppm-hr, was greater for higher exposure concentration. Membrane integrity loss, over the same exposure levels, was quantified by an equivalent cylindrical breach that was in the range of about 14 -40 µm, increasing in size with the intensity of chlorine exposure.

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Biofouling and cleaning effectiveness of surface nanostructured reverse osmosis membranes

Cited by 61 publications

References 39 publications

A review of reverse osmosis membrane fouling and control strategies

A review of reverse osmosis membrane fouling and control strategies

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

An Integrated approach for characterization of polyamide reverse osmosis membrane degradation due to exposure to free chlorine

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