Fouling of microfiltration membranes by biopolymers

Vu, Anh Tuan; Darvishmanesh, Siavash; Marroquin, Milagro; Husson, Scott M.; Wickramasinghe, S. Ranil

doi:10.1080/01496395.2016.1150295

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…[28] As seen in Table 2, the complete blockage and cake filtration models do not fit the data, suggesting that these mechanisms are not at play. For all fits, the standard blockage mechanism (described as lowering the diameter of membrane pores by consistent protein deposition [29] ) has R 2 [29] ) also shows R 2 values > 0.9, meaning that this mechanism could also potentially explain the data. This makes sense as both models rely on the filtrate flow rate.…”

Section: Resultsmentioning

confidence: 92%

Imaging and Identifying BSA Biofouling through the Combination of Fluorescence Microscopy and Flux Experiments

Widing

Ruffle-Deignan

Stennett

2021

CLEAN Soil Air Water

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Biofouling decreases efficiency of membrane-based water filtration, like desalination, because fouling decreases flow rates. Understanding biofouling mechanism is crucial for increased implementation of desalination though few techniques for studying this exist. Flux experiments are combined with fluorescent membrane images to determine the biofouling mechanism of bovine serum albumin (BSA), a common model protein, with two mixed cellulose ester membranes. Samples containing 1% to 12% fluorescently tagged BSA (remaining protein unlabeled) are tested to determine the ideal amount of labeled protein. Due to large standard deviation in the fouling decays, the relative flux decays are fit for statistical analysis. No correlation between the decay and amount of labeled protein is found, suggesting the dye has little impact on the fouling. A 2.5% or 5% labeled protein sample is optimal to generate images and visualize the beginning of cake formation (blockage of membrane pores). By fitting the flux data to biofouling mechanism equations, it is concluded BSA deposits in the membrane pores eventually leading to cake formation. These results are corroborated using scanning electron microscopy images. Combining flux and fluorescence microscopy allows for further insight into biofouling mechanism and can be applied to other biological molecules to improve filtration techniques.

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Section: Resultsmentioning

confidence: 92%

Imaging and Identifying BSA Biofouling through the Combination of Fluorescence Microscopy and Flux Experiments

Widing

Ruffle-Deignan

Stennett

2021

CLEAN Soil Air Water

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“…Solutes with pore diameters similar to those of the membrane pores completely block them, while solutes of larger pore diameters form a cake layer on the surface of the membrane. 18) As a result, membrane fouling reduces the permeate flux and water quality, increasing the transmembrane pressure (TMP) and the operational costs. 19) Thus, mitigating the adsorption (or deposition) of foulants on the membrane surface is essential for the development of ceramic membranes with superior fouling resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO<sub>2</sub> coating on alumina microfiltration membranes on flux performance in membrane fouling process

Lee

Song

et al. 2019

J. Ceram. Soc. Japan

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Inorganic surface modification was performed using a SiO 2 solgel technique to mitigate the fouling of alumina microfiltration membranes. A positively charged alumina membrane was coated with SiO 2 to generate a negative charge, and as a result, electrostatic repulsion prevented the serious adsorption (or deposition) of model foulants on the membrane. Upon the formation of the SiO 2 layer, small changes in the surface morphology, pore size, and surface roughness were detected. In particular, as the pore size decreased, the pure water permeability gradually decreased. When the membrane fouling was accelerated with model foulants, the highest normalized flux level and the lowest flux decline ratio (%) were observed in the smallest SiO 2 -coated microfiltration membrane (0.1 M SiO 2 ). In summary, the SiO 2 coating contributed to the optimization of the antifouling properties of the ceramic membranes, although the pore size was reduced.

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“…Solutes similar in size to the pore diameter block pores completely, and solutes larger than the pore diameter form a cake layer on the membrane surface. 15) Consequently, membrane fouling would lead to a decrease in permeate flux and water quality and an increase in the transmembrane pressure (TMP) and operational costs. 16) To achieve reliable membrane performance, the fouled membranes should be periodically recovered using hydraulic back-washing (for reversible fouling) or chemical cleaning (for irreversible fouling).…”

Section: Introductionmentioning

confidence: 99%

Enhanced fouling resistance of organosilane-grafted ceramic microfiltration membranes for water treatment

Lee

Song

et al. 2017

J. Ceram. Soc. Japan

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A facile surface modification technique for imposing antifouling properties on ceramic microfiltration (MF) membranes was developed based on the chemical conjugation of organosilane molecules on ceramics. The ceramic MF membranes (pore size: approximately 0.1¯m) were fabricated using conventional dip coating in an alumina slurry with nano-sized particles. The membranes were subsequently subjected to organosilane grafting with different molar concentrations (25, 50, and 100 mM). The physicochemical analysis of the organosilane-grafted membranes revealed a small decrease in pore size/roughness, which resulted from the new formation of organosilane multilayers (i.e., pore-filling effect). The pure water permeability was also diminished to some extent while exhibiting minimal influence on the permeation flux. Because of the electrostatic repulsion force between the surface-modified MF membranes and the model foulants, serious foulant adsorption followed by flux decline was significantly alleviated. In particular, the lowest organosilane concentration (25 mM) showed the greatest flux performance. This was mostly attributed to the reduced effect of pore-size restriction and electrostatic repulsion forces. We therefore achieved the optimum organosilane-grafting conditions for ceramic MF membranes, which not only minimized the alteration of surface morphology/pore size and hydraulic permeability but also remarkably improved the antifouling properties.

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Fouling of microfiltration membranes by biopolymers

Cited by 12 publications

References 34 publications

Imaging and Identifying BSA Biofouling through the Combination of Fluorescence Microscopy and Flux Experiments

Imaging and Identifying BSA Biofouling through the Combination of Fluorescence Microscopy and Flux Experiments

Effect of SiO<sub>2</sub> coating on alumina microfiltration membranes on flux performance in membrane fouling process

Enhanced fouling resistance of organosilane-grafted ceramic microfiltration membranes for water treatment

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