Electrodialysis with Bipolar Membranes (EDBM) has become a key technology for valorising waste brine streams as a new chemical production route. Even though its application has been widely studied using single electrolyte solutions (e.g., NaCl or Na2SO4), there is still a lack of knowledge about using multi-ionic mixtures. For the first time, this work aims to evaluate the EDBM performance when treating synthetic solutions mimicking the waste brines produced in a integrated process for the valorisation of solar saltworks bitterns. The behaviour of a lab-scale EDBM unit was assessed using SUEZ ion exchange membranes (IEMs), operating at 300 A m(-2), and the ion transport through IEMs was investigated, based on the calculation of apparent transport numbers and selectivities.The results highlighted that multi-ionic solutions barely affected the production of hydroxide ions. Chlorides were transported up to 7 times faster than sulphates across the anion-exchange membranes, while the cation-exchange membranes exhibited slightly higher selectivity for potassium than for sodium (similar to 1.2). The current efficiencies ranged between 70 % and 80 %, while a minimum specific energy consumption of 1.60 kWh kg(NaOH)(-1) was obtained for the most concentrated brine at 1 mol L-1 OH-.These results provide novel and valuable information to support the development and implementation of EDBM as a sustainable technology for supporting a resource-efficient and competitive economy through on-site and delocalized chemicals production routes.

Filingeri, A., Lopez, J., Culcasi, A., Leon, T., Tamburini, A., Cortina, J.L., et al. (2023). In-depth insights on multi-ionic transport in Electrodialysis with bipolar membrane systems. CHEMICAL ENGINEERING JOURNAL, 468 [10.1016/j.cej.2023.143673].

In-depth insights on multi-ionic transport in Electrodialysis with bipolar membrane systems

Filingeri, A
Primo
;
Culcasi, A
;
Tamburini, A;Micale, G;Cipollina, A
Ultimo
2023-05-22

Abstract

Electrodialysis with Bipolar Membranes (EDBM) has become a key technology for valorising waste brine streams as a new chemical production route. Even though its application has been widely studied using single electrolyte solutions (e.g., NaCl or Na2SO4), there is still a lack of knowledge about using multi-ionic mixtures. For the first time, this work aims to evaluate the EDBM performance when treating synthetic solutions mimicking the waste brines produced in a integrated process for the valorisation of solar saltworks bitterns. The behaviour of a lab-scale EDBM unit was assessed using SUEZ ion exchange membranes (IEMs), operating at 300 A m(-2), and the ion transport through IEMs was investigated, based on the calculation of apparent transport numbers and selectivities.The results highlighted that multi-ionic solutions barely affected the production of hydroxide ions. Chlorides were transported up to 7 times faster than sulphates across the anion-exchange membranes, while the cation-exchange membranes exhibited slightly higher selectivity for potassium than for sodium (similar to 1.2). The current efficiencies ranged between 70 % and 80 %, while a minimum specific energy consumption of 1.60 kWh kg(NaOH)(-1) was obtained for the most concentrated brine at 1 mol L-1 OH-.These results provide novel and valuable information to support the development and implementation of EDBM as a sustainable technology for supporting a resource-efficient and competitive economy through on-site and delocalized chemicals production routes.
22-mag-2023
Filingeri, A., Lopez, J., Culcasi, A., Leon, T., Tamburini, A., Cortina, J.L., et al. (2023). In-depth insights on multi-ionic transport in Electrodialysis with bipolar membrane systems. CHEMICAL ENGINEERING JOURNAL, 468 [10.1016/j.cej.2023.143673].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/619753
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