Feasibility study of reverse osmosis-flow capacitive deionization (RO-FCDI) for energy-efficient desalination using seawater as the flow-electrode aqueous electrolyte
- Authors
- Chung, Hyun Jun; Kim, Jungbin; Kim, David Inhyuk; Gwak, Gimun; Hong, Seungkwan
- Issue Date
- 1-4월-2020
- Publisher
- ELSEVIER
- Keywords
- Flow electrode capacitive deionization (FCDI); Seawater reverse osmosis (SWRO) desalination; Flow electrodes; Perm-selective ion exchange membrane (IEM); Specific energy consumption (SEC)
- Citation
- DESALINATION, v.479
- Indexed
- SCIE
SCOPUS
- Journal Title
- DESALINATION
- Volume
- 479
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56688
- DOI
- 10.1016/j.desal.2020.114326
- ISSN
- 0011-9164
- Abstract
- Seawater reverse osmosis (SWRO) is usually combined with brackish reverse osmosis (BWRO) to improve the water quality in seawater desalination; however, this configuration often results in high energy consumption. Consequently, membrane capacitive deionization (MCDI) has been suggested as a lower energy alternative technology, but cyclic operation within the cell (i.e., discontinuous operation of ad/desorption) is a main disadvantage. On the other hand, flow electrode capacitive deionization (FCDI) can be continuously operated by using a flow electrode. In this study, the feasibility of a SWRO-FCDI system was examined by using a suitable electrolyte in the flow electrode: seawater or SWRO concentrate. In addition, by employing a selective ion exchange membrane (IEM), the FCDI was able to selectively remove monovalent ions rather than divalent ions, unlike BWRO, thus producing a final product water containing divalent ions, which is more suitable for corrosion control in the subsequent pipe distribution systems. As a result, the remineralization process can be minimized. To test the SWRO-FCDI concept, actual SWRO permeate was first treated in a single mode with an electrolyte comprising real seawater in a flow electrode, and the feasibility of long-term operation was proven by batch-mode, which allowed the optimization of the FCDI active area.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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