Study of the influence of the electric field on membrane flux of a new type of membrane bioreactor

Chen, Junping; Yang, Changzhu; Jia-hua, Zhou; Wang, Xiaoying

doi:10.1016/j.cej.2006.10.010

Cited by 110 publications

(53 citation statements)

References 7 publications

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“…For example, it was reported that the current generation in microbial desalination cells (MDCs) could inhibit back diffusion of ions from the anolyte into the desalinated stream (Ping et al, 2016). In addition, the electric field has been employed to reduce the membrane fouling in membrane bioreactors via the electrostatic repulsion between negative charged foulants and the cathode (Bani-Melhem and Elektorowicz, 2010;Chen et al, 2007;Liu et al, 2013). Thus, we hypothesized that the current generated in OsMFCs could inhibit RSF.…”

Section: Introductionmentioning

confidence: 99%

Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells

Qin

Abu-Reesh

2016

Water Research

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a b s t r a c tOsmotic microbial fuel cells (OsMFCs) take advantages of synergy between forward osmosis (FO) and microbial fuel cells (MFCs) to accomplish wastewater treatment, current generation, and high-quality water extraction. As an FO based technology, OsMFCs also encounter reverse salt flux (RSF) that is the backward transport of salt ions across the FO membrane into the treated wastewater. This RSF can reduce water flux, contaminate the treated wastewater, and increase the operational expense, and thus must be properly addressed before any possible applications. In this study, we aimed to understand the effects of current generation and electrolyte pH on RSF in an OsMFC. It was found that electricity generation could greatly inhibit RSF, which decreased from 16.3 ± 2.8 to 3.9 ± 0.7 gMH when the total Coulomb production increased from 0 to 311 C. The OsMFC exhibited 45.9 ± 28.4% lower RSF at the catholyte pH of 3 than that at pH 11 when 40 U external resistance was connected. The amount of sodium ions transported across the FO membrane was 18.3e40.7% more than that of chloride ions. Ion transport was accomplished via diffusion and electrically-driven migration, and the theoretical analysis showed that the inhibited electrically-driven migration should be responsible for the reduced RSF. These findings are potentially important to control and reduce RSF in OsMFCs or other osmotic-driven processes.

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Section: Introductionmentioning

confidence: 99%

Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells

Qin

Abu-Reesh

2016

Water Research

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“…However, PbO 2 is the most attractive electrode owing to its excellent electrical conductivity, favorable over potential, high chemical inertness, low cost, and outstanding electrocatalytic performance [39]. Wang et al [50] The pioneer work on EMBR study based on electrophoresis and electrochemical principle was initiated by Chen et al [22] where they first applied continuous DC in submerged EMBR to treat urban sewage water. They found that the membrane flux increased substantially as electric field raised from 15 V/cm to 20 V/cm.…”

Section: Electrophoresis and Electrochemicalmentioning

confidence: 99%

“…To alleviate membrane fouling, several approaches have been investigated including optimization of operating conditions [16,17], addition of coagulants [18], relaxation and backwashing [19], alteration of membrane properties [20], and modification of MBR configuration [21]. Among which applying electricity into MBR to attain electrically-enhanced MBR (EMBR) was researched intensively [22,23]. This review article is for the first time surveys the past research on EMBR and their addressing for fouling suppression and performance enhancement in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

Ho¹,

Teow²,

Ang³

et al. 2017

JESTR

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Membrane fouling is the major challenges that hinders the widespread application of membrane bioreactor (MBR). Recently, application of electricity in electrically-enhanced MBR (EMBR) to suppress membrane fouling has gained much attention among research communities. This paper presents an overview of developments on EMBR for fouling suppression in wastewater treatment. The flow of electricity has stimulated several electrokinetic processes including electrophoresis/electrochemical process, and electrocoagulation which are the major fouling suppression mechanisms employed in EMBR. In electrophoresis, the membrane fouling is suppressed by the increased electrorepulsive force between negatively-charged foulants and cathode membrane under the influence of an electric field. Besides, electric field also induces simultaneous electrochemical oxidation and reduction which generate chemicals to degrade pollutant in wastewater. On top of that, use of active anode is reminiscent of electrocoagulation which produces cation coagulants in EMBR that capable to neutralize charge of the foulants and promotes flocs formation. This increases flocs size and sedimentation rate thereafter reduces adhesion of foulants on the membrane surface. Lastly, bioelectricity generation of microbial fuel cell (MFC) integrated with MBR to attain self-sustained EMBR has been studied. Self-sustained EMBR combines the advantages of MFC and MBR in treating wastewater and energy recovery simultaneously. Overall, it is evidenced that MBR and electrokinetic processes have a synergetic enhancement effect in EMBR system.

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“…Beside vibration, bubbling and ultrasonic techniques which have been intensively reported, there are other techniques, such as magnetic stirring, ozonation [116] the use of electric fields [117] and even the introduction of bi-disperse suspensions for higher critical flux in RO systems [118], that can create enhanced hydrodynamic conditions in membrane separation systems to enhance the permeation and reduce membrane fouling.…”

Section: Miscellaneous Techniquesmentioning

confidence: 99%

Membrane module design and dynamic shear-induced techniques to enhance liquid separation by hollow fiber modules: a review

Yang¹,

Wang²,

Fane³

et al. 2013

Desalination and Water Treatment

119

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Membrane-based separation processes have found numerous applications in various industries over the past decades. However, higher energy consumption, lower productivity and shorter membrane lifespan due to polarization and membrane fouling continue to present severe technical challenges to membrane-based separation. Improved membrane module design and novel hydrodynamics offer strategies to address these challenges.This review focuses on hollow fiber membrane modules which are well-suited to membrane contactor separation processes. Attempts to improve membrane module design should begin with a better understanding of the mass transfer in the hollow fiber module, therefore this review provides a summary of prior studies on the mass transfer models related to both the shell-side and tube-side fluid dynamics. Based on the mass transfer analysis, two types of technique to enhance hollow fiber membrane module performance are discussed: (1) passive enhancement techniques that involve the design and fabrication of effective modules with optimized flow geometry; or (2) active enhancement techniques that uses external energy to induce a high shear regime to suppress the undesirable fouling and concentration polarization phenomena. This review covers the progress over the past five years on the most commonly proposed techniques such as bubbling, vibrations and ultrasound.Both enhancement modes have their advantages and drawbacks. Generally, the passive enhancement techniques offer modest improvement of the system performance, while the active techniques, including bubbling, vibrating and ultrasound, are capable of providing as high as 315 times enhancement of the permeation flux. Fundamentally, the objectives of module design should include the minimization of the cost per amount of mass transferred (energy consumption 3 and module production cost) and the maximization of the system performance through optimizing the flow geometry and operating conditions of the module, scale-up potential and expansion of niche applications. It is expected that this review can provide inspiration for novel module development.

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Study of the influence of the electric field on membrane flux of a new type of membrane bioreactor

Cited by 110 publications

References 7 publications

Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells

Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

Membrane module design and dynamic shear-induced techniques to enhance liquid separation by hollow fiber modules: a review

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