Membrane capacity and fouling mechanisms for ultrathin nanomembranes in dead-end filtration

Winans, Joshua D.; Smith, K.; Gaborski, Thomas R.; Roussie, James A.; McGrath, James L.

doi:10.1016/j.memsci.2015.10.053

Cited by 29 publications

(22 citation statements)

References 37 publications

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“…Unlike in the cross-flow operation, filtration takes place at right-angle to the surface of the membrane [96]. Report has shown that the tendency for membrane surface polarization to occur in dead-end filtration is high due to the persisting interaction with the feed [97]. The particulates and Nevertheless, it is important to strike a balance between the selectivity and productivity performance indices; this will prevent compromise of any of the indices.…”

Section: Types Of Membranementioning

confidence: 99%

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Abdulsalam

Man

Idris

et al. 2018

Water

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Over the years, different types of alternative technologies have been developed and used for palm oil mill effluent (POME) treatment. Specifically, membrane bioreactor (MBR) has been employed to relegate pollutants contained in POME under different operating conditions, and the technology was found to be promising. The major challenge impeding the wider application of this technology is membrane fouling, which usually attracts high operating energy and running cost. In this regard, novel methods of mitigating membrane fouling through the treatment processes have been developed. Therefore, this review article specifically focuses on the recent treatment processes of POME using MBR, with particular emphasis on innovative processes conditions such as aerobic, anaerobic, and hybrid processing as well as their performance in relation to fouling minimization. Furthermore, the effects of sonication and thermophilic and mesophilic conditions on membrane blockage were critically reviewed. The types of foulants and fouling mechanism as influenced by different operating conditions were also analyzed censoriously.

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Section: Types Of Membranementioning

confidence: 99%

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Abdulsalam

Man

Idris

et al. 2018

Water

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“…These have been made with a variety of materials including silicon, silicon‐nitride, silicon dioxide, graphene, and graphene‐oxide . We have recently demonstrated that the high permeability of ultrathin membranes causes them to foul rapidly in NFF, with initial pore blockage events quickly followed by cake filtration . We showed the same fouling phenomena occurs with both particle and protein solutes when used in NFF …”

Section: Introductionmentioning

confidence: 84%

Tangential Flow Microfluidics for the Capture and Release of Nanoparticles and Extracellular Vesicles on Conventional and Ultrathin Membranes

Dehghani

Lucas

Flax

et al. 2019

Adv Materials Technologies

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Membranes have been used extensively for the purification and separation of biological species. A persistent challenge is the purification of species from concentrated feed solutions such as extracellular vesicles (EVs) from biological fluids. Investigated is a new method to isolate micro‐ and nanoscale species termed tangential flow for analyte capture (TFAC), which is an extension of traditional tangential flow filtration. Initially, EV purification from plasma on ultrathin nanomembranes is compared between both normal flow filtration (NFF) and TFAC. NFF results in rapid formation of a protein cake which completely obscures any captured EVs and also prevents further transport across the membrane. On the other hand, TFAC shows capture of CD63 positive small EVs with minimal contamination. The use of TFAC to capture target species over membrane pores, wash, and then release in a physical process that does not rely upon affinity or chemical interactions is explored. This process is studied with model particles on both ultrathin and conventional thickness membranes. Successful capture and release of model particles is observed using both membranes. Ultrathin nanomembranes show higher efficiency of capture and release with significantly lower pressures indicating that ultrathin nanomembranes are well‐suited for TFAC of delicate nanoscale particles such as EVs.

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“…The fouling problem is currently the main disadvantage of membranes technology because it entails high cleaning and replacing costs . How the fouling reduces the flow is a subject that has been studied for several years and in which contributions are still being made today …”

Section: Introductionmentioning

confidence: 99%

“…[13,14] How the fouling reduces the flow is a subject that has been studied for several years and in which contributions are still being made today. [15][16][17][18] The need for an approach that alleviates concerns related to safety, toxicology, and environmental problems has generated interest in "green" electrospinning processes. For some water-soluble polymers, electrospinning can be performed in aqueous solutions, and a waterresistant membrane is then achieved using an environmentally friendly crosslinker and a post-manufactured treatment.…”

Section: Introductionmentioning

confidence: 99%

Reversible swelling as a strategy in the development of smart membranes from electrospun polyvinyl alcohol nanofiber mats

Cimadoro

Goyanes

2020

Journal of Polymer Science

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This work presents an electrospun nanofibrous membrane for water treatment, designed to reduce its pores through polymer swelling to retain contaminants, and after that, reopening them for easy cleaning. It consists of a polyvinyl alcohol (PVA) mat crosslinked with a natural agent to avoid water solubility but allow a high swelling of its nanofibers. Then, when the membrane is brought into contact with water, a transitory state occurs during which nanofibers increase their diameter 68%, closing the pores between them. For studying the swelling reversal effect, distilled water filtering was used observing a decrease in the permeate flow over time until a steady state is reached. This phenomenon is explained by the closure of pores, and it is described with a fouling model widely used in the literature. Thanks to this decrease in the pore size, the membrane achieves a rejection rate much higher than conventional PVA electrospun membranes, being capable to retain 20 nm nanoparticles with a rejection rate up to 99%. Swelling is reversible through a simple drying process, which allows reopening the pores and cleaning the fouling easily. Both the membrane and its use strategy extend the capacity of electrospun mats in a sustainable way.

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Membrane capacity and fouling mechanisms for ultrathin nanomembranes in dead-end filtration

Cited by 29 publications

References 37 publications

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Tangential Flow Microfluidics for the Capture and Release of Nanoparticles and Extracellular Vesicles on Conventional and Ultrathin Membranes

Reversible swelling as a strategy in the development of smart membranes from electrospun polyvinyl alcohol nanofiber mats

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