Investigation of a novel high-efficiency ion-permselective membrane module based on the electrochemically switched ion exchange scheme

The most important obstacle to the widespread use of membrane bioreactors (MBRs) is membrane fouling. In this study, a high-efficiency compact MBR was developed. Therefore, the draft tube of the jet loop reactor (JLB) was planned for use as a membrane module. The high-velocity jet streams, which are present according to the nature of the JLBs, provide high crossflow (cut-off force) on the membrane surface. Thus, the produced membrane module is operated in submerged membrane mode. This enhanced JLB modification is named the membrane draft tube jet loop reactor (MDJLR). This new system has a KLa value of 139 h−1 (at E/V of 2.24 kW m−3). In the next stage, treatment of slaughterhouse wastewater with the MDJLR was carried out. Under the 5.5 kg COD m−3 d−1 loading rate, efficiencies over 97% were achieved. The system operated continuously for 50 days without membrane backwashing or cleaning. During this period, fluxes of 3 L m−2·h−1 were approximately obtained at operating conditions of 850 mg L−1 MLSS (mixed liquor suspended solids) concentration, 1 bar suction pressure (∆P), and 3000 L h−1 circulation rate. This developed MDJLR will make jet loop membrane bioreactors (JLMBRs) and MBRs more compact and improve their performance.

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A magnetic ion exchange resin with high efficiency of removing Cr (VI)

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2020.125279 ◽

2020 ◽

Vol 604 ◽

pp. 125279

Author(s):

Yafeng Ren ◽

Youhua Han ◽

Xingfeng Lei ◽

Chuan Lu ◽

Jin Liu ◽

...

Keyword(s):

Ion Exchange ◽

High Efficiency ◽

Exchange Resin ◽

Ion Exchange Resin ◽

Magnetic Ion

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Supporting the propane dehydrogenation reactors by hydrogen permselective membrane modules to produce ultra-pure hydrogen and increasing propane conversion: Process modeling and optimization

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2019.04.286 ◽

2020 ◽

Vol 45 (12) ◽

pp. 7364-7373 ◽

Cited By ~ 3

Author(s):

H. Jowkary ◽

M. Farsi ◽

M.R. Rahimpour

Keyword(s):

Process Modeling ◽

Conversion Process ◽

Propane Dehydrogenation ◽

Pure Hydrogen ◽

Propane Conversion ◽

Modeling And Optimization ◽

Permselective Membrane ◽

Membrane Modules

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CFD simulation of the aeration process and baffle influence in a full-scale commercial flat sheet module

Water Science & Technology ◽

10.2166/wst.2020.259 ◽

2020 ◽

Vol 81 (9) ◽

pp. 2004-2010

Author(s):

Yingchen Cao ◽

Bowen Gu ◽

Alexander Sonnenburg ◽

Wilhelm Urban

Keyword(s):

Shear Stress ◽

Cfd Simulation ◽

Full Scale ◽

Membrane Module ◽

Flat Sheet ◽

Average Shear ◽

Computational Fluid Dynamics Cfd ◽

Membrane Modules ◽

Aeration Process ◽

A Minor

Abstract The goal of the present paper is to investigate the aeration process and the enhanced effect of baffles in a full-scale commercial membrane bioreactor (MBR) system configured with a flat sheet (FS) membrane module. Through a computational fluid dynamics (CFD) simulation, two aerated FS membrane modules for full-scale applications with 26 membrane sheets were simulated. The numerical results indicate that the presence of baffles and the distances between the baffle and the outmost membrane sheet have a minor influence on the area-weighted shear stress for full-scale MBRs. In addition, bubble size and the bottom distance between the aerator and membrane bottom do not affect the average shear stress of full-scale FS membrane modules much. However, an increase in air flow rate has a significant effect on the area-weighted shear stress. A large FS membrane module is recommended, as it could achieve the same cleaning effect as the small one with a lower specific aeration demand for membranes.

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Electrochemical Performance Evaluation of Bipolar Membrane Using Poly(phenylene oxide) for Water Treatment System

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.18788 ◽

2020 ◽

Vol 20 (11) ◽

pp. 6797-6801

Author(s):

Tae Yang Son ◽

Jun Seong Yun ◽

Kihyun Kim ◽

Sang Yong Nam

Keyword(s):

Tensile Strength ◽

Ion Exchange ◽

Water Splitting ◽

High Efficiency ◽

Ion Exchange Membranes ◽

Bipolar Membrane ◽

Porous Support ◽

Bipolar Membranes ◽

Phenylene Oxide ◽

Exchange Membrane

This study describes the use of poly(phenylene oxide) polymer-based ion-exchange polymers, polystyrene-based ion-exchange particles and a porous support for fabricating bipolar membranes and the results of an assessment of the applicability of these materials to water splitting. In order to achieve good mechanical as well as good ion-exchange properties, bipolar membranes were prepared by laminating poly(phenylene oxide) and polystyrene based ion-exchange membranes with a sulfonated polystyrene-block-(ethylene-ran-butylene)-block-polystyrene) (S-SEBS) modified interface. PE pore-supported ion-exchange membranes were also used as bipolar membranes. The tensile strength was 13.21 MPa for the bipolar membrane which utilized only a cation/anion-exchange membrane. When ion-exchange nanoparticles were introduced for high efficiency, a reduction in the tensile strength to 6.81 MPa was observed. At the same time, bipolar membrane in the form of a composite membrane using PE support exhibited the best tensile strength of 32.41 MPa. To confirm the water-splitting performance, an important factor for a bipolar membrane, pH changes over a period of 20 min were also studied. During water slitting using CA-P-PE-BPM, the pH at the CEM part and the AEM part changed from 5.4 to 4.18 and from 5.4 to 5.63, respectively.

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Recovery of Lithium from Seawater Using Nano-Manganese Oxide Adsorbents Prepared by Gel Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.449-452.277 ◽

2004 ◽

Vol 449-452 ◽

pp. 277-280 ◽

Cited By ~ 21

Author(s):

Kang Sup Chung ◽

Jae Chun Lee ◽

Eun Jin Kim ◽

Kyung Chul Lee ◽

Yang Soo Kim ◽

...

Keyword(s):

Ion Exchange ◽

Manganese Oxide ◽

Tartaric Acid ◽

Acid Treatment ◽

High Performance ◽

High Efficiency ◽

Lithium Ion ◽

Adsorption And Desorption ◽

Formation Method ◽

Acid Gel

Adsorbing and salvaging extremely small quantities of lithium ion, high-performance ion-exchange type lithium ion adsorbent was prepared through the ion-sieve formation method. The method uses acid treatment after the synthesis of spinel-structured nano-Li1.33Mn1.67O4 precursor through the tartaric acid gel process. It has good selectivity and high efficiency in adsorbing lithium ion in seawater. The generated adsorbent showed a 28.2 mg/g lithium uptake from artificial seawater. This adsorbent further showed a difference reproducibility that was lower than 10% when subjected to five cycles of adsorption and desorption experiments.

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