College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China.
College of Grassland Agriculture, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China.
J Environ Manage. 2019 Oct 15;248:109237. doi: 10.1016/j.jenvman.2019.07.008. Epub 2019 Jul 13.
Cu readily complexes with ethylenediaminetetraacetic acid (EDTA) to form a heavy metal complex (Cu-EDTA) that is typical in the effluents from mining and electroplating industries. It was difficult for the classical alkaline precipitation method to eliminate the heavy metal complex due to the strong bonding ability between Cu(II) and EDTA. Cu(II) release and removal performance after Cu-EDTA decomplexation in a non-thermal plasma oxidation system was carried out in this study. The removal process was characterized by chemical oxygen demand, total organic carbon, atomic force microscopy, and electroconductivity analysis. The toxicity effect of the treated Cu-EDTA solution was also tested by photobacterium bioassay. The experimental results showed that 80.2% of Cu was released and removed within 60 min of the non-thermal plasma treatment/alkaline precipitation. Relatively higher energy input, lower Cu-EDTA concentration, and acidic conditions were necessary to obtain greater Cu release and removal performance, and there existed an appropriate air flow rate for high-efficient Cu release and removal. O, OH, O, and O were the main active substances leading to Cu release. Its residual toxicity to P.phosphoreum sp.-T3 was significantly reduced after treatment.
铜容易与乙二胺四乙酸（EDTA）形成重金属配合物（Cu-EDTA），这在采矿和电镀行业的废水中很常见。由于 Cu(II) 和 EDTA 之间的强结合能力，经典的碱性沉淀法很难去除重金属配合物。本研究在非热等离子体氧化系统中进行了 Cu-EDTA 解络合后 Cu(II) 的释放和去除性能研究。通过化学需氧量、总有机碳、原子力显微镜和电导率分析对去除过程进行了表征。还通过发光细菌生物测定法测试了处理后的 Cu-EDTA 溶液的毒性效应。实验结果表明，在非热等离子体处理/碱性沉淀 60 min 内，80.2%的 Cu 被释放和去除。较高的能量输入、较低的 Cu-EDTA 浓度和酸性条件有利于获得更好的 Cu 释放和去除性能，并且存在适当的气流速率以实现高效的 Cu 释放和去除。O、OH、O 和 O 是导致 Cu 释放的主要活性物质。处理后其对 P.phosphoreum sp.-T3 的残余毒性显著降低。
