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Membrane Water Treatment Volume 14, Number 1, January 2023 , pages 47-54 DOI: https://doi.org/10.12989/mwt.2023.14.1.047 |
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open access
Electrodialysis with a channeled stack for high strength cadmium removal from wastewater |
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Kyung Jin Min, Hyo Jin An, Ah Hyun Lee, Hyun-Gon Shin and Ki Young Park
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Abstract | ||
In this study, high concentrations of cadmium-containing wastewater were treated by electrodialysis (ED) with a channel stack. The limiting current density (LCD), cadmium removal efficiency, and current efficiency were investigated under each experimental condition according to the Reynolds number (Re), membrane area, and pH. With the increase in the film area to 111, 333, 555, and 777 cm2 at Re (109.1), LCDs decreased to 408.11, 44.45, 35.32, and 13.64 A/m2, respectively. The highest cadmium removal efficiency (99.6%) and current efficiency were obtained for the membrane area of 111 and 777 cm2, respectively. Under changing Re in the pH range of 1 to 4, Re and LCD were proportional under the same pH condition, and pH and LCD tended to be inversely proportional under the same Re condition. Cadmium removal rate was the best at the pH range 3 - 4. It has been found that ED with channeled stacks can be successfully applied to treat wastewater containing high concentrations of cadmium. | ||
Key Words | ||
cadmium; channeled stack; electrodialysis; limiting current density; Reynolds number | ||
Address | ||
Kyung Jin Min, Hyo Jin An, Ah Hyun Lee and Ki Young Park: Department of Civil and Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea Hyun-Gon Shin: Department of Energy and Environmental Engineering, Shinhan University, Gyeonggi-do 480-857, Korea | ||