06 Feb Analysis of Operational Parameters in Acid and Base Production Using an Electrodialysis with Bipolar Membranes Pilot Plant
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by Emin
Marta Herrero-Gonzalez, Julio López, Giovanni Virruso, Calogero Cassaro, Alessandro Tamburini, Andrea Cipollina, Jose Luis Cortina, Raquel Ibañez, Giorgio Micale
In agreement with the Water Framework Directive, Circular Economy, and European Union (EU) Green Deal packages, the EU-funded WATER-MINING project aims to validate next-generation water resource solutions at the pre-commercial demonstration scale in order to provide water management and recovery of valuable materials from alternative sources. In the framework of the WATER-MINING project, desalination brines from the Lampedusa (Italy) seawater reverse osmosis (SWRO) plant will be used to produce freshwater and recover valuable salts by integrating different technologies. In particular, electrodialysis with bipolar membranes (EDBM) will be used to produce chemicals (NaOH and HCl). A novel EDBM pilot plant (6.4 m², FuMa-Tech) has been installed and operated. The performance of EDBM for single pass under different flow rates (2–8 L·min⁻¹) for acid, base, and saline channels, and two current densities (200 and 400 A·m⁻²), has been analyzed in terms of specific energy consumption (SEC) and current efficiency (CE). Results showed that by increasing the flow rates, generation of HCl and NaOH slightly increased. For example, ∆OH⁻ shifted from 0.76 to 0.79 mol·min⁻¹ when the flow rate increased from 2 to 7.5 L·min⁻¹ at 200 A·m⁻². Moreover, SEC decreased (1.18–1.05 kWh·kg⁻¹) while CE increased (87.0–93.4%), achieving minimum (1.02 kWh·kg⁻¹) and maximum (99.4%) values, respectively, at 6 L·min⁻¹.
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