Electrohydrodynamics of Bipolar Membranes

Ganchenko, Nataly; Kalaydin, E. N.; Ganchenko, G. S.; Demekhin, E. A.

doi:10.1134/s1028335818010032

Cited by 2 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, Davis et al [22] investigated the use of Neosepta ® membranes, achieving a maximum concentration of less than 0.4 M of acid and a base with SECs in the range of 1-2 kWh kg −1 NaOH and 3.65 kWh kg −1 HCl . Nowadays, numerous BPMs are available from different manufacturers for EDBM applications; several research studies have analysed their performance and relevant properties [17,23,24]. As a result, the main challenges on EDBM are associated with the influence of the feed solution composition on membrane performance, particularly the presence of dissolved organic matter or scaling forming solutes in terms of operation problems (e.g., organic fouling, biofouling, and/or scaling).…”

Section: Introductionmentioning

confidence: 99%

Electrodialysis with Bipolar Membranes for the Generation of NaOH and HCl Solutions from Brines: An Inter-Laboratory Evaluation of Thin and Ultrathin Non-Woven Cloth-Based Ion-Exchange Membranes

et al. 2022

View full text Add to dashboard Cite

The SEArcularMINE project aims to recover critical raw materials (CRMs) from brines from saltworks, thus facing a CRM shortage within Europe. To promote a fully circular scheme, the project valorises concentrated brines using electrodialysis with bipolar membranes (EDBM) to generate the required amounts of reactants (i.e., acids and bases). Regarding the performances of new non-woven cloth ion-exchange membranes (Suez): (i) an ultra-thin non-woven polyester cloth and (ii) a thin polypropylene cloth acting as the support structures were assessed. Additionally, the anion layer includes a catalyst to promote the water dissociation reaction. The effect of current density (100, 200, and 300 A m−2) on the performance of two combinations of membranes in an inter-laboratory exercise using 2 M NaCl was evaluated. According to statistical analysis ANOVA, there was an agreement on the results obtained in both laboratories. NaOH/HCl solutions up to 0.8 M were generated working at 300 A m−2 using both combinations of membranes. Regarding the performance parameters, stack set-ups incorporating thin polypropylene membranes showed lower specific energy consumption (SEC) and higher specific productivity (SP) than ultra-thin polypropylene ones. Hence, for ultra-thin polypropylene membranes, SEC was reported to be between 2.18 and 1.69 kWh kg−1NaOH and SP between 974 and 314 kg m−2 y−1.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrodialysis with Bipolar Membranes for the Generation of NaOH and HCl Solutions from Brines: An Inter-Laboratory Evaluation of Thin and Ultrathin Non-Woven Cloth-Based Ion-Exchange Membranes

et al. 2022

View full text Add to dashboard Cite

show abstract

Bipolar nanochannels: the effects of an electroosmotic instability. Part 1. Steady-state response

Abu-Rjal,

Green

2024

Flow

View full text Add to dashboard Cite

The steady-state current–voltage response of ion-selective systems varies as the number of ion-selective components is varied. For the highly investigated unipolar system, including only one ion-selective component, it has been shown that above a supercritical voltage, an electroosmotic instability is triggered, leading to overlimiting currents. In contrast, the effects of this instability on the current–voltage response of the second most common system of a bipolar system, including two oppositely charged permselective regions, have yet to be reported. Using numerical simulations, we investigate the steady-state electrical response of bipolar systems as we vary the ratio of the charge within the two oppositely charged regions. The responses are divided into those with an internal symmetry related to the surface charge and those without. In contrast to the unipolar systems, bipolar systems with the internal symmetry do not exhibit overlimiting currents and their steady-state response is identical to the convectionless steady-state response. In contrast, the systems without the internal symmetry exhibit much more complicated behaviour. For positive voltages, they have overlimiting currents, while for negative voltages, they do not have overlimiting currents. Our findings contribute to a more profound understanding of the behaviour of the current–voltage response in bipolar systems.

show abstract

Electrohydrodynamics of Bipolar Membranes

Cited by 2 publications

References 6 publications

Electrodialysis with Bipolar Membranes for the Generation of NaOH and HCl Solutions from Brines: An Inter-Laboratory Evaluation of Thin and Ultrathin Non-Woven Cloth-Based Ion-Exchange Membranes

Electrodialysis with Bipolar Membranes for the Generation of NaOH and HCl Solutions from Brines: An Inter-Laboratory Evaluation of Thin and Ultrathin Non-Woven Cloth-Based Ion-Exchange Membranes

Bipolar nanochannels: the effects of an electroosmotic instability. Part 1. Steady-state response

Contact Info

Product

Resources

About