Author
C. H. Alex Kuo
Bio: C. H. Alex Kuo is an academic researcher from West Virginia University. The author has contributed to research in topics: Electrofiltration & Filter cake. The author has an hindex of 1, co-authored 1 publications receiving 132 citations.
Topics: Electrofiltration, Filter cake
Papers
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TL;DR: In this paper, a mathematical model and experimental data are presented for both a kaolin clay suspension and an oil in water chemically stabilized emulsion, and the model is used in conjunction with experimental data to separate the liquid film resistance adjacent to the filter cake which is determined by fluid shear and electric field from the cake and filter medium resistances which are influenced by electroosmosis.
Abstract: The cross flow/electrifiltration process combines migration of particles in the presence of electrical and shear fields to increase filtration rates. A mathematical model and the experimental data are presented for both a kaolin clay suspension and an oil in water chemically stabilized emulsion. When the filter is operated in a regime above the critical voltage, filtration rate-electric field strength dependence becomes linear, and both electroosmosis in the filtration medium and electrophoresis in the liquid film are the controlling mechanisms of transport. Both experimental data and the mathematical model indicate that the fluid circulation rate tangential to the filtration media does not necessarily increase filtration rate depending on the regime of operation. The model is used in conjunction with the experimental data to separate the liquid film resistance adjacent to the filter cake which is determined by fluid shear and electric field from the cake and filter medium resistances which are influenced by electroosmosis.
133 citations
Cited by
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TL;DR: This manuscript provides an overview of recent developments and published literature in membrane technology, focusing on special characteristics of the membranes and membrane-based processes that are now used for the production and purification of proteins.
461 citations
TL;DR: In this article, a comprehensive overview of the wide range of techniques used in the control of fouling in both MF and UF membranes is presented, as well as the amount of research that has gone into the various techniques used and the results achieved after experimental work.
Abstract: Membrane‐based processes are very susceptible to flux decline due to concentration polarization and fouling problems and the concept of fouling control via process optimization, membrane surface modification, and cleaning have been the focus of research in wastewater and water treatment. MF and UF membranes are utilized in many areas of industry. The main sector of application includes water and wastewater. There has been emphasis on the various methods used to reduce and, where possible, eliminate fouling. This review is a comprehensive insight into the wide range of techniques used in the control of fouling in both MF and UF membranes. It also addresses the amount of research that has gone into the various techniques used and the results achieved after experimental work.
421 citations
TL;DR: In this article, a review of recent developments in ultra-filtration process, focusing on fouling mechanisms of ultrafiltration membranes as well as the latest techniques used to counter membrane fouling is presented.
Abstract: Ultrafiltration process has been applied widely in food processing industry for the last 20 years due to its advantages over conventional separation processes such as gentle product treatment, high selectivity, and lower energy consumption. Ultrafiltration becomes an essential part in food technology as a tool for separation and concentration. However, membrane fouling compromises the benefits of ultrafiltration as fouling significantly reduces the performance and hence increases the cost of ultrafiltration. Recent advances in this area show the various intensive studies carried out to improve ultrafiltration, focusing on membrane fouling control and cleaning of fouled membranes. Thus, this paper reviews recent developments in ultrafiltration process, focusing on fouling mechanisms of ultrafiltration membranes as well as the latest techniques used to counter membrane fouling.
204 citations
TL;DR: In this article, the most common causes of microfiltration membrane fouling are summarized and reviewed, the range of methods covered include feed pre-treatment, choice of membrane material, flow manipulation, the use of high shear, gas sparging and additional force fields.
147 citations
TL;DR: In this article, the authors reviewed the process design, theory and some applications of cross-flow membrane filtration enhanced by a DC electric field and found significant enhancement of the flux compared with the flux with no electric field.
Abstract: Techniques for fouling prevention in membrane filtration are needed. This paper reviews the process design, theory and some applications of crossflow membrane filtration enhanced by a DC electric field. An electric field can be applied across the membrane or the membrane itself can be the electrode. The performance of the filtration process is, in both cases, primarily improved due to electrophoresis. Electro-osmosis was found to be significant in some cases when an electric field was applied across the membrane. The theory of electrically enhanced crossflow membrane filtration is quite complex and there is no generally accepted model describing this process. Significant enhancement of the flux compared with the flux with no electric field has been found in the filtration of particles or colloids with high electrophoretic mobility using a pressure at which the cake was formed without an electric field and an electric field strength at which the net particle migration was away from the membrane. Apart from enhancement of the flux, the quality of the permeate has been found to improve by applying an electric field.
138 citations