Effect of flow oscillations on mass transfer in electrodialysis with bipolar membrane

Saremirad, Pegah; Gomaa, Hassan; Zhu, Jesse

doi:10.1016/j.memsci.2012.03.006

Cited by 20 publications

(11 citation statements)

References 40 publications

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“…However, one of the drawbacks of EDBM, when applied to waste valorization, is that it is not as economically competitive as other membrane separation technologies, due to the electrodes and ion exchange membranes cost and the capital cost. Despite this economical limitation, all the features previously commented have made EDBM an environmentally friendly technology for valorization and management of industrial brines [1, [20][21][22]. A clear application is, thus, the salt-rich waste valorization for the production of acids and bases and a growth number of applications with industrial brines are reported [1, 16,17,23,24].…”

Section: Introductionmentioning

confidence: 99%

Integration of monopolar and bipolar electrodialysis for valorization of seawater reverse osmosis desalination brines: Production of strong acid and base

et al. 2016

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Water scarcity in the Mediterranean basin has been solved by using seawater desalination reverse osmosis technology (SWD-RO). This technology produces brine which is discharged back into the sea resulting in an environmental impact on marine ecosystems. Under the circular economy approach, the aim of this work is to recover resources from NaCl-rich brine (~60-70 g/L), e.g. in the form of NaOH and HCl, by integration of two ion exchange-based membrane technologies and quantify the electrical energy consumption. Electrodialysis (ED) incorporating monovalent selective cation exchange membranes as divalent ions purification and concentration of the NaCl present in the SWD-RO brine, was integrated with bipolar membrane ED (EDBM) to produce NaOH and HCl. Current densities of 0.30–0.40 kA/m2 at two temperature ranges simulating different seawater temperature regimes (15-18 ºC and 22-28ºC) were tested and a pure NaCl solution was used as starting concentrate stream. NaCl-rich brines with 100 or 200 gNaCl/L were obtained by ED and then introduced in the EDBM stack producing HCl and NaOH up to 2 M, depending on the initial concentrations. A minimum energy consumption of 1.7 kWh/kgNaOH was calculated when working by EDBM with initial concentrations of 104 g NaCl/L and 0.24 M HCl and NaOH.Peer ReviewedPostprint (author's final draft

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Section: Introductionmentioning

confidence: 99%

Integration of monopolar and bipolar electrodialysis for valorization of seawater reverse osmosis desalination brines: Production of strong acid and base

et al. 2016

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“…A number of recent papers have highlighted how transport phenomena and, more in general, process efficiency can be enhanced by operating ED units in non-stationary conditions. Oscillations applied by dynamically changing either the flow rate [225,232,262,311] or the electrical field [153, 154, 165-167, 173, 191, 312, 313] can achieve an intensification of ED systems performance. Pulsed flows or pulsed electric fields at relatively high frequencies (thus, with a time constant much smaller than the large characteristic time scales for diffusion typical of high Schmidt numbers systems) caused the DBL to be disrupted and the concentration profile to flatten, with transient concentration fields different from a sequence of steady states.…”

Section: Ed Stacks Operated Under Oscillating Conditionsmentioning

confidence: 99%

Electrodialysis for water desalination: A critical assessment of recent developments on process fundamentals, models and applications

et al. 2018

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“…While the potential of these techniques is not in doubt, the physics underpinning the processes leading to the observed reduction in fouling is not well understood and results provided by the literature are often presented in dimensional form [ 11 , 12 , 13 , 14 ], which makes them have no general validity and only a (weak) support for an empirical, and hence unreliable, design of anti-fouling hydrodynamic techniques.…”

Section: Introductionmentioning

confidence: 99%

New Facility for Membrane Fouling Investigations under Customizable Hydrodynamics: Validation and Preliminary Experiments with Pulsating Cross-Flow

2022

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Flux reduction induced by fouling is arguably the most adverse phenomenon in membrane-based separation systems. In this respect, many laboratory-scale filtration studies have shown that an appropriate use of hydrodynamic perturbations can improve both performance and durability of the membrane; however, to fully understand and hence appropriately exploit such effects, it is necessary to understand the underpinning flow processes. Towards this end, in this work we propose and validate a new module-scale laboratory facility with the aim of investigating, at very well-controlled flow conditions, how hydrodynamics affects mass transport phenomena at the feed/membrane interface. The proposed facility was designed to obtain a fully developed and uniform flow inside the test section and to impose both steady and pulsating flow conditions. The walls of the facility were made transparent to grant optical accessibility to the flow. In this paper, we discuss data coming from particle image velocimetry (PIV) measurements and preliminary ultrafiltration tests both under steady and pulsating flow conditions. PIV data indicate that the proposed facility allows for excellent flow control from a purely hydrodynamic standpoint. Results from filtration tests provide promising results pointing towards pulsating flows as a viable technique to reduce fouling in membrane systems.

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Effect of flow oscillations on mass transfer in electrodialysis with bipolar membrane

Cited by 20 publications

References 40 publications

Integration of monopolar and bipolar electrodialysis for valorization of seawater reverse osmosis desalination brines: Production of strong acid and base

Integration of monopolar and bipolar electrodialysis for valorization of seawater reverse osmosis desalination brines: Production of strong acid and base

Electrodialysis for water desalination: A critical assessment of recent developments on process fundamentals, models and applications

New Facility for Membrane Fouling Investigations under Customizable Hydrodynamics: Validation and Preliminary Experiments with Pulsating Cross-Flow

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