Experimental study on bipolar membrane electrodialysis treatment of reverse osmosis brine for acid and alkali production in coal chemical industry

XU Bitao; WANG Xudong; YANG Yifei; CHEN Jiaheng; XUE Yichun; WANG Ruize

doi:10.13205/j.hjgc.202504017

Volume 43 Issue 4

Apr. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(4): 174-181

XU B T，WANG X D，YANG Y F，et al.Experimental study on bipolar membrane electrodialysis treatment of reverse osmosis brine for acid and alkali production in coal chemical industry［J］.Environmental Engineering，2025，43（4）：174-181. doi: 10.13205/j.hjgc.202504017

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Experimental study on bipolar membrane electrodialysis treatment of reverse osmosis brine for acid and alkali production in coal chemical industry

doi: 10.13205/j.hjgc.202504017

Key Laboratory of Membrane Separation in Shaanxi Province, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Received Date: 2024-01-26
Accepted Date: 2024-05-12
Rev Recd Date: 2024-03-21
Publish Date: 2025-04-01

Abstract

Abstract

The treatment of coal chemical wastewater has become a significant challenge， restricting the development of coal chemical enterprises. While the dual-membrane process of "nanofiltration + reverse osmosis" is commonly employed for separating organic substances and inorganic salts in wastewater， it's insufficient in treating the reverse osmosis brine generated during this process. This study focused on exploring a more efficient method to treat the reverse osmosis brine， specifically through bipolar membrane electrodialysis （BMED）， with the aim of recovering valuable acids and bases while improving the overall treatment efficiency. This research systematically examined the impact of various operational parameters on the performance of the BMED， including membrane stack voltage， membrane surface flow rate， product-to-raw material volume ratio， and current efficiency. The results revealed that the optimal performance was achieved when the membrane stack voltage was set at 24 V， the membrane surface flow rate was 3.540 cm/s， and the product-to-raw material volume ratio was maintained at 5：5. These findings provide valuable insights into the treatment of coal chemical wastewater， specifically in terms of enhancing the recovery of valuable chemicals from reverse osmosis brine. This research could serve as a sound reference for improving the efficiency of coal chemical wastewater treatment processes and mitigating the challenges associated with brine disposal.
- bipolar membrane electrodialysis,
- coal chemical industry,
- reverse osmosis brine,
- zero discharge

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References(27)

References

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