Capturing CO2 with NaOH solution from reject brine via an integrated technology based on bipolar membrane electrodialysis and hollow fiber membrane contactor

Advancements in Bipolar Membrane Electrodialysis Techniques for Carbon Capture

“…An environmentally friendly approach to CO 2 capture, focusing on harnessing the NaOH solution produced from reject brine through BMED, has been described . The process achieved maximum concentrations of generated acid and base, reaching 1.88 and 2.01 mol/L, respectively.…”

“…The urgent need to combat climate change and decrease atmospheric carbon dioxide (CO 2 ) levels has catalyzed the exploration of innovative carbon capture technologies. Among these, bipolar membrane electrodialysis (BMED) stands out, especially for its potential in extracting CO 2 from abundant sources like seawater. − Seawater, which covers ∼71% of Earth’s surface, is a vast reservoir of dissolved inorganic carbon. Effectively harnessing this resource for carbon capture presents a significant opportunity in mitigating global warming.…”

“…Past reviews of BMED have addressed a wide range of subjects. Applications covered in the reviews include the dissociation of salt and solvent, 14 the recovery of bases and acids from salts, CO 2 capture, the recovery of ammonia nitrogen, 1 and the production of high-value alkalis and acids from saline wastewater. 15 These studies highlight BMED's environmental and economic benefits, emphasizing its ability to reduce the use of chemical reagents and carbon emissions while converting waste salts into valuable resources.…”

“…1 .89 The extraction of DIC as CO 2 gas is facilitated by inducing a pH swing, significantly enhancing the availability of CO 2 for extraction with a change of only 2 pH…”

Response to Comment on “Recovery of Magnesium from Industrial Effluent and Its Implication on Carbon Capture and Storage”

“…Basically, the recovery of CO 2 can be divided into two steps (see Figure ): (1) the absorption of gaseous CO 2 into water matrices by sodium hydroxide and (2) the conversion of absorbed CO 2 in the form of carbonate into magnesium carbonate granules. The first step has already been extensively explored, and high efficiencies have been reported. − Therefore, we aimed to address the second step (orange zone in Figure ), which can bring values to the absorbed CO 2 process of the first step. The authors agree with the valuable comment from Dr. Marian Turek and Dr. Krzysztof Mitko that the purity of the recovered magnesium carbonate is relatively lower than the commercial product.…”