Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China.
Chemosphere. 2020 Feb;240:124942. doi: 10.1016/j.chemosphere.2019.124942. Epub 2019 Sep 23.
Advanced oxidation processes (AOPs) can degrade heavy metal complexes in wastewater to improve the removal efficiency of metals. However, the influences of AOP treatments on toxicity induced by metal complexes are not well understood. This study compared the toxicity induced by EDTA-copper (Cu) after UV/persulfate (PS) and UV/HO treatments on luminescent bacteria and human HepG2 cells. The results showed that EDTA-Cu complexes decreased Cu toxicity in luminescent bacteria but increased the cytotoxicity in HepG2 cells, indicating species-specific toxicity. The UV/PS and UV/HO treatments under most pH values and [oxidant]/[EDTA-Cu] conditions decreased the toxicity of EDTA-Cu in HepG2 cells but increased the toxicity in luminescent bacteria. When the ratio of [oxidant] to [EDTA-Cu] was 10, low toxicity in treated solutions was observed in both UV treatment processes. The alkaline precipitation treatment had a significant influence on toxicity reduction after UV/PS treatment; however, it had minimal influence on the UV/HO treatment system. The Cu and total organic carbon (TOC) removal efficiency cannot completely explain the results of toxicity assays. EDTA-Cu intermediates might play important roles in changing the toxicity of EDTA-Cu after both UV treatments. This study provides insights into evaluating the treatment efficiency of UV/PS and UV/HO on EDTA-Cu decomplexation.
高级氧化工艺（AOPs）可以降解废水中的重金属配合物，以提高金属的去除效率。然而，AOP 处理对金属配合物诱导毒性的影响尚不清楚。本研究比较了 UV/过硫酸盐（PS）和 UV/过氧单硫酸盐（HO）处理后 EDTA-铜（Cu）配合物对发光菌和人 HepG2 细胞的诱导毒性。结果表明，EDTA-Cu 配合物降低了发光菌中 Cu 的毒性，但增加了 HepG2 细胞的细胞毒性，表明具有物种特异性毒性。在大多数 pH 值和[氧化剂]/[EDTA-Cu]条件下，UV/PS 和 UV/HO 处理降低了 HepG2 细胞中 EDTA-Cu 的毒性，但增加了发光菌的毒性。当[氧化剂]与[EDTA-Cu]的比值为 10 时，两种 UV 处理过程中处理溶液的毒性均较低。UV/PS 处理后的碱性沉淀处理对降低毒性有显著影响；然而，它对 UV/HO 处理系统的影响最小。Cu 和总有机碳（TOC）的去除效率不能完全解释毒性测定的结果。EDTA-Cu 中间体可能在两种 UV 处理后改变 EDTA-Cu 的毒性方面发挥重要作用。本研究为评估 UV/PS 和 UV/HO 对 EDTA-Cu 解络合的处理效率提供了新的见解。
