Analysis of Trace Ions in Chromium-Containing Wastewater on the Performance of RED Stack and Cr(VI) Reduction Rate

DOI

10.2991/978-94-6463-708-3_50How to use a DOI?

Keywords

salt difference energy; Reverse electrodialysis; sewage disposal

Abstract

Salt gradient energy (SGE) is a kind of chemical potential difference energy existing between electrolyte solutions with different concentrations, which can be converted into high-grade mechanical energy or electrical energy by certain technical means. Reverse electrodialysis (RED) can convert this kind of energy into electric energy, and it has become the main technology of salt difference energy recovery because of its direct conversion and simple equipment. Chromium (Cr(VI)) in sewage discharged from human production and living activities will threaten human health through enrichment. Therefore, reducing Cr(VI) wastewater with high toxicity to Cr(III) with low toxicity and then discharging it is the main technical means adopted in sewage treatment at present, but the current reduction technology has some problems such as high cost and high energy consumption. Recovering salt differential energy and reducing chromium-containing wastewater with RED can reduce Cr(VI) in wastewater and convert salt differential energy into electric energy. The effects of common ions (Cu²⁺, Zn²⁺ and Fe³⁺) in chromium-containing wastewater on the performance of the stack and the reduction of Cr(VI) were studied. These ions were added to the cathode solution of Cr(VI) by the method of controlled variables, and their effects on the output performance of RED stack and the reduction rate of Cr(VI) were analyzed. The results show that adding different concentrations of Cu²⁺, Zn²⁺ and Fe³⁺ to the cathode solution can significantly promote the reduction rate of Cr(VI) by more than 20%, especially adding Cu²⁺ to the cathode solution of Cr(VI). Further study on the concentration of trace ions and the flow rate of electrolyte shows that there is an optimal concentration for each ion to promote the reduction of Cr(VI), and the reduction rate of Cr(VI) is higher at low flow rate of cathode solution. Additionally, adding trace ions can effectively reduce the internal resistance of the RED stack, but does not significantly enhance the performance of the RED stack.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Jipeng Jin
AU  - Lei Jiang
PY  - 2025
DA  - 2025/05/09
TI  - Analysis of Trace Ions in Chromium-Containing Wastewater on the Performance of RED Stack and Cr(VI) Reduction Rate
BT  - Proceedings of the 2024 10th International Conference on Advances in Energy Resources and Environment Engineering (ICAESEE 2024)
PB  - Atlantis Press
SP  - 473
EP  - 479
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-708-3_50
DO  - 10.2991/978-94-6463-708-3_50
ID  - Jin2025
ER  -