Abstract
Wastewater containing a high concentration of chloride ions (Cl− ions) generated in industrial production will corrode equipment and pipelines and cause environmental problems. At present, systematic research on Cl− removal by electrocoagulation is scarce. To study the Cl− removal mechanism, process parameters (current density and plate spacing), and the influence of coexisting ions on the removal of Cl− in electrocoagulation, we use aluminum (Al) as the sacrificial anode, combined with physical characterization and density functional theory (DFT) to study Cl− removal by electrocoagulation. The result showed that the use of electrocoagulation technology to remove Cl− can reduce the concentration of Cl− in an aqueous solution below 250 ppm, meeting the Cl− emission standard. The mechanism of Cl− removal is mainly co-precipitation and electrostatic adsorption by forming chlorine-containing metal hydroxyl complexes. The current density and plate spacing affect the Cl− removal effect and operation cost. As a coexisting cation, magnesium ion (Mg2+) promotes the removal of Cl−, while calcium ion (Ca2+) inhibits it. Fluoride ion (F−), sulfate (SO42−), and nitrate (NO3−) as coexisting anions affect the removal of Cl− ions through competitive reaction. This work provides a theoretical basis for the industrialization of Cl− removal by electrocoagulation.
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This work is supported by the Natural Science Foundation of Shanxi (201901D111084).
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Zirui Wang: investigation, writing – original draft. Xiaowei An: investigation, writing – review and editing. Peifen Wang: investigation. Xiao Du: investigation. Xiaogang Hao: conceptualization, methodology. Xiaoqiong Hao: investigation. Xuli Ma: conceptualization, methodology, funding acquisition.
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Wang, Z., An, X., Wang, P. et al. Removal of high concentration of chloride ions by electrocoagulation using aluminium electrode. Environ Sci Pollut Res 30, 50567–50581 (2023). https://doi.org/10.1007/s11356-023-25792-1
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DOI: https://doi.org/10.1007/s11356-023-25792-1