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Redox flow desalination based on the temperature difference as a driving force
Dai,Jinhong1,2; Huang,Mingzhi3; Hui,Kwan San4; Yu,Denis Y.W.5; Yan,Dongliang6; Hui,Kwun Nam7; Tan,Swee Ching8; Zhang,Liguo3; Chen,Fuming1,2
Source PublicationChemical Engineering Journal

How to effectively reduce the consumption of electrical energy is a key topic in many studies of electrochemical desalination. In this work, we use the temperature difference to drive a continuous process of dialysis desalination. The system consists of a thermoelectric unit and a desalination unit connected in series. The thermoelectric unit includes a thermoelectric generator (TEG), a heater as heat source and an air-cooled heat sink to generate electricity and for the desalination unit. The desalination unit contains two platinum-coated hydrophobic carbon cloths as current collectors, a mixture of [Fe(CN)6]3-/4- as anolyte and catholyte, concentrated and diluted salt streams with two cationic and one anionic exchange membranes separated configuration (CEM|AEM|CEM). During the charging process driven by temperature difference, chloride and sodium ions in the diluted salt stream move to the concentrated salt stream and cathodic reservoir, respectively. The results show that the concentration of brine drops significantly from 5,000 ppm to 344.3 ppm as the current decreases to 0.06 mA from the initial 1.30 mA when the temperature difference is maintained at 65 K. Concurrently, the average salt removal rate is up to 8.8 μg cm−2 min−1 and average heat consumption is 284.3 MJ mole-1. Moreover, the influences from the temperature difference, salt feeds content and electrolyte concentration are also investigated in detail. This research has the potential application for the freshwater obtainment via the utilization of waste heat, and will be significant in places with the shortage of the electrical energy such as ships, islands and oceans with the temperature differences.

KeywordElectrochemical Desalination Energy Consumption Redox Flow Desalination Thermo Drive Water Treatment
URLView the original
Scopus ID2-s2.0-85096528098
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Cited Times [WOS]:2   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorChen,Fuming
Affiliation1.Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou,510006,China
2.Guangdong-Hong Kong Joint Laboratory of Quantum Matter,Frontier Research Institute for Physics,South China Normal University,Guangzhou,510006,China
3.Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment,School of Environment,South China Normal University,Guangzhou,510006,China
4.Engineering,Faculty of Science,University of East Anglia,Norwich,United Kingdom
5.School of Energy and Environment,City University of Hong Kong,Kowloon,Tat Chee Avenue,Hong Kong
6.School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin,541004,China
7.Joint Key Laboratory of the Ministry of Education,Institute of Applied Physics and Materials Engineering,University of Macau,Avenida da Universidade,Taipa, Macau,China
8.Department of Materials Science and Engineering,National University of Singapore,Singapore,9 Engineering Drive 1,117574,Singapore
Recommended Citation
GB/T 7714
Dai,Jinhong,Huang,Mingzhi,Hui,Kwan San,et al. Redox flow desalination based on the temperature difference as a driving force[J]. Chemical Engineering Journal,2021.
APA Dai,Jinhong,Huang,Mingzhi,Hui,Kwan San,Yu,Denis Y.W.,Yan,Dongliang,Hui,Kwun Nam,Tan,Swee Ching,Zhang,Liguo,&Chen,Fuming.(2021).Redox flow desalination based on the temperature difference as a driving force.Chemical Engineering Journal.
MLA Dai,Jinhong,et al."Redox flow desalination based on the temperature difference as a driving force".Chemical Engineering Journal (2021).
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