Recovery of Salinity Gradient Energy in Brine from Seawater Desalination using Reverse Electrodialysis

化学工业与工程

Chemcial Industry and Engineering

2018, Vol. 35

Issue (6) :54-61 DOI: 10.13353/j.issn.1004.9533.20171036

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Recovery of Salinity Gradient Energy in Brine from Seawater Desalination using Reverse Electrodialysis

Deng Huining¹, Feng Miao¹, Tian Ming², He Yunfei¹

1. School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, China;
2. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China

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Abstract Seawater desalination is an effective approach to solve the problem of worldwide water scarcity. The process discharge high concentration brine as by-product together with fresh water. The reverse electrodialysis(RED) is an emerging ion-exchange-membrane-based process that draws electrical power from the salinity gradient between two solutions. RED was used to harvest the salinity gradient energy between the brines discharged from seawater reverse osmosis (SWRO) unit and the seawater. The power density and energy efficiency of both the single-and multi-stage RED process were studied by modeling. The power density of the single-stage RED increases with the increasing of water recovery in SWRO and the decreasing of RED compartment thickness, but the efficiency is less than 30%. Multi-Stage RED could further improve the energy efficiency. This research provided a new approach for brine management.

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	Deng Huining
	Feng Miao
	Tian Ming
	He Yunfei

Keywords： reverse electrodialysis； renewable energy； desalination； salinity gradient energy； mathematical simulation

Received 2017-12-04;

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Deng Huining, Feng Miao, Tian Ming, He Yunfei.Recovery of Salinity Gradient Energy in Brine from Seawater Desalination using Reverse Electrodialysis[J] Chemcial Industry and Engineering, 2018,V35(6): 54-61

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