Bipolar membrane electrodialysis of Na2CO3 and industrial green liquor for producing NaOH: A sustainable solution for pulp and paper industries

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-05-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
100450
Series
Chemical Engineering Journal Advances, Volume 14
Abstract
Industrial waste with high salinity cannot be drained into waterways due to tightened environmental regulations. Bipolar membrane electrodialysis (BPED) is getting more attraction not only to treat water flows but also to produce valuable commodities. The BPED technique has various advantages in terms of product purity, control over product concentration, having no by-products, low environmental impact, and low energy consumption. In this short paper, we emphasize a comparative study in two different configurations for the treatment of green liquor (a waste solution of NaOH, Na2S and Na2CO3 from pulp mills) with BPED to produce NaOH. The best results are obtained in a five-compartment setup where the capture of H2S formed from green liquor is possible, followed by the capture of CO2. This work also indicates that BPED technology is a sustainable solution to treat carbonate-rich waste, which will facilitate the current need to control greenhouse emissions.
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Keywords
electrodialysis, ion-exchange membranes, waste treatment, H2S and CO2 recovery
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Citation
Kuldeep,, Ahonen, T, Rosenthal, M & Murtomäki, L 2023, ' Bipolar membrane electrodialysis of Na 2 CO 3 and industrial green liquor for producing NaOH: A sustainable solution for pulp and paper industries ', Chemical Engineering Journal Advances, vol. 14, 100450 . https://doi.org/10.1016/j.ceja.2023.100450