Model for colloidal fouling of membranes

Bacchin, Patrice; Aimar, Pierre; Sánchez, V.

doi:10.1002/aic.690410218

Cited by 258 publications

(195 citation statements)

References 19 publications

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“…These results show an increase in critical flux with the cross-flow velocity and a decrease in critical flux when adding salt. These experiments underline the importance of surface interactions on the critical flux; the critical flux is higher when repulsive surface interactions (stability) are larger as shown in [2]. The critical flux concept which has been theoretically explained by the presence of colloidal surface interactions [2] therefore seems suited to the description of such a system.…”

Section: Experimental Filtration Resultsmentioning

confidence: 63%

“…• a mass balance with classical convective and diffusive terms to which is added a term for surface interaction between a colloid and the surface [2] • a force balance (mechanical) on a particle near the membrane surface [12] which integrates a force induced by multi-body surface interaction.…”

Section: Physical Basis For Distribution Of Critical Flux (Dcf)mentioning

confidence: 99%

“…Critical flux is a concept that appeared in the mid 1990's [1][2][3][4] to describe the lowest flux for which fouling appears on a membrane. Since then, it has been generally accepted that critical flux represents the permeate flux below which no fouling occurs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Distributions of critical flux: modelling, experimental analysis and consequences for cross-flow membrane filtration

Bacchin

Espinasse

Aimar

2005

Journal of Membrane Science

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Section: Experimental Filtration Resultsmentioning

confidence: 63%

Section: Physical Basis For Distribution Of Critical Flux (Dcf)mentioning

confidence: 99%

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Distributions of critical flux: modelling, experimental analysis and consequences for cross-flow membrane filtration

Bacchin

Espinasse

Aimar

2005

Journal of Membrane Science

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“…One such strategy is based on using membranes in sub-critical filtration conditions. These conditions are limited by the critical flux (JC): a quantitative filtration parameter defined firstly as "the flux below which no fouling occurs" (Bachin et al, 1995), or as "the flux below which a decline of flux with time does not occur; above it, fouling is observed" (Field et al, 1995). On the basis of these definitions, two different concepts have developed.…”

Section: Mlts Levels In Aerobic Mbrsmentioning

confidence: 99%

Polyvinyl alcohol nanofiber reinforced Nafion membranes for fuel cell applications

Mollá

Compañ

2011

Journal of Membrane Science

132

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A submerged anaerobic MBR demonstration plant with two commercial hollowfibre ultrafiltration systems (PURON ® , Koch Membrane Systems, PUR-PSH31) was operated using municipal wastewater at high levels of mixed liquor total solids (MLTS) (above 22 g L -1 ). A modified flux-step method was applied to assess the critical flux (JC) at different gas sparging intensities. The results showed a linear dependency between JC and the specific gas demand per unit of membrane area (SGDm). JC ranged from 12 to 19 LMH at SGDm values of between 0.17 and 0.5 Nm 3 h -1 m -2 , which are quite low in comparison to aerobic MBR. Long-term trials showed that the membranes operated steadily at fluxes close to the estimated JC, which validates the JC obtained by this method. After operating the membrane for almost two years at sub-critical levels, no irreversible fouling problems were detected, and therefore, no chemical cleaning was conducted. KeywordsCritical flux; gas sparging; industrial hollow-fibre membranes; modified flux-step 2 method; submerged anaerobic membrane bioreactor

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“…These tools have been considered primordial to understand fouling phenomenon and its prevention, developing modified membrane materials [6] and better pretreatments [7]. Studies about cleaning, specially in UF and MF have been considered secondary, even it is critical to plant operation [8].…”

Section: Introductionmentioning

confidence: 99%

Cleaning of ultrafiltration membranes after the treatment of surface water: static–dynamic test

García-Fayos

Arnal

Sancho

2012

Desalination and Water Treatment

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Access to safe drinkable water is a basic human right and an international development goal. AQUAPOT international project, created by Chemical and Nuclear Engineering Department of the Polytechnic University of Valencia, has been focused on research and development of low-cost and effective water treatment technologies based on membrane technology able to be used in developing countries. After several years of intensive laboratory and field research, Aquapot's UF plants have been settled in different locations of Ecuador (province of Azuay) and Mozambique (province of Maputo). At present, most of the installed plants work successfully, producing drinking water suitable for human consumption and even for industrial use. However, installation of the designed UF-drinking water treatment facilities has shown that cleaning standard protocol of ultrafiltration membranes is not effective. This fact could affect microbiological quality and volume of the pure water produced and also life of the membrane and the UF-plant. In order to develop optimized cleaning protocols based on the use of common and accessible chemicals, Aquapot started an applied research studying several cleaning methods. Previous studies have been focussed in applying different types of cleaning: chemical cleaning (by means of static tests and dynamic tests) and physico-chemical cleaning (combining chemical reagents with the hydrodynamic action of air bubbles). This work describes the experimental procedure performed in static-dynamic cleaning test which combine soaking with dynamic circulation of cleaning solutions. Sodium hypochlorite and Hydrogen Peroxide at 25 ºC performed the best results, recovering permeate flux from 10 to 12 times respectively compared with fouled membranes. Main results obtained for the different chemical solutions tested at 25 and 40 ºC were also compared with previous chemical (static and dynamic test) and physico-chemical cleanning. Results showed that the tested cleaning protocol improves the effectiveness of the cleaning and recovers UF membrane performance even until 30 times, when sequence of cleaning is Sodium hypochlorite followed by hydrogen peroxide.

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Model for colloidal fouling of membranes

Cited by 258 publications

References 19 publications

Distributions of critical flux: modelling, experimental analysis and consequences for cross-flow membrane filtration

Distributions of critical flux: modelling, experimental analysis and consequences for cross-flow membrane filtration

Polyvinyl alcohol nanofiber reinforced Nafion membranes for fuel cell applications

Cleaning of ultrafiltration membranes after the treatment of surface water: static–dynamic test

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