Advanced Wastewater Treatment: Synergistic Integration of Reverse Electrodialysis with Electrochemical Degradation Driven by Low-Grade Heat

Qiang Leng (), Feilong Li, Zhenxin Tao, Zhanwei Wang and Xi Wu ()
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Qiang Leng: Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang 471023, China
Feilong Li: Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang 471023, China
Zhenxin Tao: Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang 471023, China
Zhanwei Wang: Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang 471023, China
Xi Wu: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

Energies, 2024, vol. 17, issue 21, 1-24

Abstract: The reverse electrodialysis heat engine (REDHE) represents a transformative innovation that converts low-grade thermal energy into salinity gradient energy (SGE). This crucial form of energy powers reverse electrodialysis (RED) reactors, significantly changing wastewater treatment paradigms. This comprehensive review explores the forefront of this emerging field, offering a critical synthesis of key discoveries and theoretical foundations. This review begins with a summary of various oxidation degradation methods, including cathodic and anodic degradation processes, that can be integrated with RED technology. The degradation principles and characteristics of different RED wastewater treatment systems are also discussed. Then, this review examines the impact of several key operational parameters, degradation circulation modes, and multi-stage series systems on wastewater degradation performance and energy conversion efficiency in RED reactors. The analysis highlights the economic feasibility of using SGE derived from low-grade heat to power RED technology for wastewater treatment, offering the dual benefits of waste heat recovery and effective wastewater processing.

Keywords: reverse electrodialysis heat engine; salinity gradient energy; wastewater treatment; electrochemical degradation; low-grade heat (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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