Parametric study of multichannel desalination battery for low-energy electrochemical deionization of brackish water

被引:9
作者
Lee, Jiho [1 ]
Lee, Jaehan [2 ]
Hong, Seok Won [1 ]
Kim, Choonsoo [3 ]
Yoon, Jeyong [4 ,5 ]
机构
[1] Korea Inst Sci & Technol, Water Cycle Res Ctr, Seoul 02792, South Korea
[2] Hongik Univ, Coll Sci & Technol, Dept Biol & Chem Engn, 2639 Sejong Ro, Sejong Si 30016, South Korea
[3] Kongju Natl Univ, Dept Environm Engn, 1223-23 Cheonan Daero, Cheonan Si 31080, South Korea
[4] Seoul Natl Univ SNU, Inst Chem Proc, Coll Engn, Sch Chem & Biol Engn, Seoul 151742, South Korea
[5] Korea Environm Inst, 370 Sicheong Daero, Sejong Si 30147, South Korea
关键词
Brackish water; Desalination battery; Capacitive deionization; Energy consumption; Multichannel flow system; HYBRID CAPACITIVE DEIONIZATION; MEMBRANE DISTILLATION; STORAGE ELECTRODE; ACTIVATED CARBON; PERFORMANCE; INTERCALATION; SEAWATER; CATION; CELL; CDI;
D O I
10.1016/j.desal.2021.115188
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Multichannel desalination batteries (MC-DBs) have been utilized to enhance the performance of battery electrodes by decoupling the electrodes (side channels) and target brackish water (middle feed channel), enabling independent control of the channels. Nevertheless, the technological level of MC-DB is at an infancy, and further understanding of the role of operating conditions is required for its practical application. In this study, a parametric investigation of the applied current, cutoff voltage, and solution concentration fed to the feed and side channels was performed to improve the electrochemical deionization of MC-DB to achieve low-energy brackish water desalination. With presence of 20 times concentration difference between the feed and side channels, the MC-DB retained approximately 76% of the initial desalination capacity even upon a ten-fold increase in the current density (5-50 A center dot m- 2). Moreover, MC-DB exhibiting a salinity gradient minimized the resistance penalty resulting from the low-salinity of brackish water. A high battery-utilization ratio (>80%) was achieved at various feed water concentrations. Up to 73% of the energy consumed for desalination was recovered through modification of the current and cutoff voltage. Consequently, under the optimized conditions, the MC-DB system could desalinate low-salinity brackish water with a substantially reduced energy consumption of 5.5 kJ center dot mol-1.
引用
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页数:8
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