Application of Membranes in Biotechnology

Ghosh, Raja

doi:10.1002/9781118522318.emst125

Cited by 2 publications

(1 citation statement)

References 59 publications

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“…Dead-end microfiltration (MF) and ultrafiltration (UF) are used in a variety of industrial and municipal settings as efficient and practical methods for removing turbidity, microorganisms, and other colloidal pollutants (1)(2)(3). During bacterial filtration, accumulation of microorganisms on the MF/UF membrane surface or within its porous matrix causes fouling (4,5). In most environmental applications, the flow is periodically reversed, in the time frame of tens of minutes, to control what is operationally termed "reversible fouling" (6,7).…”

Section: Introductionmentioning

confidence: 99%

Optimal backwashing in dead-end bacterial microfiltration with irreversible attachment mediated by extracellular polymeric substances production

Cogan

Jian

Badireddy

et al. 2016

Journal of Membrane Science

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Microfiltration and ultrafiltration are methods of removing colloidal impurities from water and wastewater. One of the major issues when dealing with the practical implementation of membranes is the reduction of water productivity as the foulants accumulate on the membrane surface or within the pores. Membrane regeneration by periodic backwashing is an effective method of reducing fouling; however, to date the timing and duration of the backwashing for effective fouling control is largely only empirically determined. In this manuscript, we present an optimal control formulation to determine the timing and duration for membrane regeneration by backwashing. In this formulation, we use the direction of the flow as the control variable and make predictions regarding the optimal protocol. We explicitly include irreversible attachment due to bacterial deposition and biofilm formation on the membrane and demonstrate that irreversible attachment of bacteria has important ramifications for the effective timing of hydraulic backwashes as well as the efficiency in producing clean water. In particular, we find that irreversible attachment and additional fouling due to exo-polymeric substance (EPS) production and biofilm formation decreases the maximum filtration volume. Additionally, as the effectiveness of membrane regeneration declines, the timing of the cycling is also altered. In general, including the role of EPS in biofouling substantially changes predictions of backwashing timing and implies important considerations for practical predictions.

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Section: Introductionmentioning

confidence: 99%

Optimal backwashing in dead-end bacterial microfiltration with irreversible attachment mediated by extracellular polymeric substances production

Cogan

Jian

Badireddy

et al. 2016

Journal of Membrane Science

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Dual-Ionomer-Based Device: Acetylcholine Transport and Nonenzymatic Sensing

Abdullayeva

Kumtepe

Altaf

et al. 2020

ACS Appl. Mater. Interfaces

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The malfunctioning in the release of acetylcholine (ACh+), leading to consequential damages in the neural system, has become an impulsion for the development of numerous progressive transport and detection gadgets. However, several challenges, such as laterality and complexity of transport devices, low precision of amperometric detection systems, and sumptuous, multistaged enzymatic quantification methods, have not yet been overcome. Herein, ionomers, because of their selective ion transporting nature, are chosen as suitable candidates for being implemented into both targeted ACh+ delivery and sensing systems. Based on these two approaches, for the very first time in the literature, the disulfonated poly(arylene ether sulfone) membrane is concurrently (i) used in the mimicry of transduction of the electrical-to-ionic signal in a neural network as “Acetylcholine Pen” (ACh+ Pen) and (ii) operated as a highly sensitive, conductivity-based ACh+ quantifier. Our dual device, being able to operate under an actual action potential of 55 mVbias, shows a strong potential of future applicability in real-time ionic delivery-and-sensing systems.

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Application of Membranes in Biotechnology

Cited by 2 publications

References 59 publications

Optimal backwashing in dead-end bacterial microfiltration with irreversible attachment mediated by extracellular polymeric substances production

Optimal backwashing in dead-end bacterial microfiltration with irreversible attachment mediated by extracellular polymeric substances production

Dual-Ionomer-Based Device: Acetylcholine Transport and Nonenzymatic Sensing

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