Deep utilization of salinity gradient energy between concentrated seawater and river water by multi-stage reverse electrodialysis

Journal Article

Title: Deep utilization of salinity gradient energy between concentrated seawater and river water by multi-stage reverse electrodialysis

Author:

Guo, Z.; Cui, W.; Ji, Z.; Tumba, K.; Wang, J.; Fu, L.; Zhang, Z.; Liu, J.; Zhao, Y.; Zhang, Z.; Yuan, J.

Publication Date:

November 15, 2023

Journal:

Desalination

Volume:

566

Publisher:

Elsevier

Affiliation:

Hebei University of Technology, Mangosuthu University of Technology, Langfang Yadeshi Environmental Protection Equipment Co.

Technology:

Salinity Gradient, Reverse Electrodialysis

Collection Method:

Lab Data

Engineering:

Performance

Document Access

Website:

External Link

Citation

Guo, Z.; Cui, W.; Ji, Z.; Tumba, K.; Wang, J.; Fu, L.; Zhang, Z.; Liu, J.; Zhao, Y.; Zhang, Z.; Yuan, J. (2023). Deep utilization of salinity gradient energy between concentrated seawater and river water by multi-stage reverse electrodialysis. Desalination, 566 https://doi.org/10.1016/j.desal.2023.116900

Abstract

While concentrated seawater discharged by desalination plants requires considerable efforts to alleviate undesired environmental risk, the conversion of salinity gradient energy to electric energy is considered an ideal way. In this work, the experiment and simulation of multi-stage reverse electrodialysis (MS-RED) were carried out, and the influence of flow rate and compartment thickness of high concentration compartment (HCC) and low concentration compartment (LCC) on the MS-RED performance were investigated independently for the huge concentration difference between HCC and LCC. The optimized flow rates of LCC and HCC were 0.96 cm·s⁻¹ and 0.71 cm·s⁻¹, and the compartment thicknesses of LCC and HCC were 1.05 mm and 0.85 mm, respectively. Furthermore, the performance of series multi-stage reverse electrodialysis (SMS-RED) and independent multi-stage reverse electrodialysis (IMS-RED) was compared, and SMS-RED showed better performance than IMS-RED. With the optimized conditions of SMS-RED, the power generation and energy efficiency were reached 684.07 W and 16.22 % after 20 stages, respectively, while the concentration of concentrated seawater was reduce from 66.70 to 37.63 g·L⁻¹. The results can provide a theoretical basis for the industrial development of MS-RED to achieve the deep utilization of concentrated seawater and reduce the environmental risks of its direct discharge.