The paper discusses a method to treat wastewater (Cu-EDTA, copper ethylenediamine tetra acetic acid) using micro-arc plasma by combining micro-arc oxidation technology and advanced oxidation technology from the fields of material surface treatment and environmental engineering. The aim is to change copper ions from a complex state to a free state. The decomplexation rate was up to 73.82%, and the mineralization rate was up to 32.7% for the samples after 100 min of treatment with micro-arc plasma. Cu-EDTA decomplexation is divided into the decomposition of EDTA and free copper ion reactions. The active substance reacts with Cu-EDTA to generate intermediates, leading to the mineralization of EDTA through continuous decomposition and synthesis. Meanwhile, copper ions complete the decomplexation and react with other anions in the solution and on the anode surface. This study not only provides a new wastewater treatment technology but also improves the theoretical study of micro-arc plasma on organic matter.

Keywords: Cu-EDTA; Electric discharge plasma; Heavy metal complex; Industrial wastewater; TC4; Titanium alloy.

© 2025. The Author(s), under exclusive licence to Springer Nature Switzerland AG.

本文讨论了一种使用微弧等离子体处理含铜-EDTA（乙二胺四乙酸铜）废水的方法，该方法结合了材料表面处理和环境工程领域的微弧氧化技术和高级氧化技术。目的是将铜离子从络合状态转化为游离态。经过100分钟的微弧等离子体处理后，脱络合率达到73.82%，矿化率可达32.7%。Cu-EDTA的脱络合过程分为EDTA分解和游离铜离子反应两部分。活性物质与Cu-EDTA反应生成中间体，通过连续的分解和合成导致EDTA的矿化。同时，铜离子完成脱络合并与其他溶液中的阴离子以及阳极表面的阴离子发生反应。本研究不仅提供了一种新的废水处理技术，还改进了微弧等离子体在有机物处理方面的理论研究。

关键词：Cu-EDTA；电放电等离子体；重金属络合物；工业废水；TC4；钛合金。

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