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Effect of Chloride Ions on Electro-Coagulation to Treat Industrial Wastewater Containing Cu and Ni

Author

Listed:
  • Chien-Hung Huang

    (Department of Health Wellness and Marketing, Kainan University, Taoyuan 33857, Taiwan)

  • Shan-Yi Shen

    (Department of Environmental Engineering and Management, Chaoyang University of Technology, Taichung 41349, Taiwan)

  • Chiu-Wen Chen

    (Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan)

  • Cheng-Di Dong

    (Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan)

  • Mohanraj Kumar

    (Department of Environmental Engineering and Management, Chaoyang University of Technology, Taichung 41349, Taiwan)

  • Balasubramanian Dakshinamoorthy

    (Raman Research Laboratory, PG & Research Department of Physics, Government Arts College, Tiruvannamalai 606603, Tamilnadu, India)

  • Jih-Hsing Chang

    (Department of Environmental Engineering and Management, Chaoyang University of Technology, Taichung 41349, Taiwan)

Abstract

A series of experiments with different NaCl concentrations added to the PCB (printed circuit board) wastewater were prepared to investigate the chloride effect on the formation of aluminum floc and removal efficiency of Cu and Ni. The effects of pH, current density, and different concentration of NaCl were studied and the results are discussed. Results imply that chloride ions are favored to avoid the passivation of the aluminum anode in the EC (electro-coagulation) system. Chloride ions used as the electrolyte can facilitate the release of Al 3+ , which results in the current efficiency of over 100% in the EC system. For the PCB factory’s wastewater, the EC system could remove Cu 2+ and Ni 2+ effectively (both Cu and Ni concentration of treated wastewater was less than 1.0 mg/L within three minutes). PCB wastewater’s pH value could maintain stably about 9.0 in the EC system when the initial pH value was around 2.5. The estimated electricity consumption for treating PCB wastewater by the EC process was about 0.894 kWh for each meter of cubic wastewater.

Suggested Citation

  • Chien-Hung Huang & Shan-Yi Shen & Chiu-Wen Chen & Cheng-Di Dong & Mohanraj Kumar & Balasubramanian Dakshinamoorthy & Jih-Hsing Chang, 2020. "Effect of Chloride Ions on Electro-Coagulation to Treat Industrial Wastewater Containing Cu and Ni," Sustainability, MDPI, vol. 12(18), pages 1-11, September.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:18:p:7693-:d:414994
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    Cited by:

    1. D. Marmanis & C. Emmanouil & J. G. Fantidis & A. Thysiadou & K. Marmani, 2022. "Description of a Fe/Al Electrocoagulation Method Powered by a Photovoltaic System, for the (Pre-)Treatment of Municipal Wastewater of a Small Community in Northern Greece," Sustainability, MDPI, vol. 14(7), pages 1-16, April.

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