State Key Laboratory of Eco-Hydraulics in North West Arid Region of China, Xi'an University of Technology, Xi'an 710048, China.
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Sci Total Environ. 2023 Feb 1;858(Pt 2):159856. doi: 10.1016/j.scitotenv.2022.159856. Epub 2022 Oct 29.
Industrial wastewater contains a mixture of refractory and hazardous pollutants that have comprehensive toxic effects. We investigated the treatment of a long-chain industrial wastewater treatment train containing Fenton, biological anoxic/oxic (AO), and heterogeneous ozone catalytic oxidation (HOCO) processes, and evaluated their detoxification effect based on the analysis of the genic toxicity of some key contaminants. The results showed that although the effluent met the discharge standard in terms of traditional quality parameters, the long-chain treatment process could not effectively detoxify the industrial wastewater. The analysis results of summer samples showed that the Fenton process increased the total toxicity and genotoxicity of the organics, concerned metals, and non-volatile pollutants, whereas the A/O process increased the toxicity of the organics and non-volatile pollutants, and the HOCO process led to higher toxicity caused by metals and non-volatile pollutants. The outputs of the winter samples indicated that the Fenton process reduced the total toxicity and genotoxicity caused by non-volatile pollutants but increased that of the organics and concerned metals. The effect of the A/O process on the effluent toxicity in winter was the same as that in summer, whereas the HOCO process increased the total toxicity and genotoxicity of the metals in winter samples. Correlation analysis showed that various toxicity stresses were significantly correlated with the variation of these key pollutants in wastewater. Our results could provide a reference for the optimization of industrial wastewater treatment plants (IWTPs) by selecting more suitable treatment procedures to reduce the toxicity of different contaminants.
工业废水中含有多种难处理和有害的污染物，具有综合的毒性效应。我们研究了包含芬顿、生物缺氧/好氧（AO）和多相臭氧催化氧化（HOCO）工艺的长链工业废水处理系统的处理，并根据一些关键污染物的基因毒性分析评估了其解毒效果。结果表明，尽管该工艺的出水在传统质量参数方面符合排放标准，但长链处理工艺并不能有效地对工业废水进行解毒。夏季样本的分析结果表明，芬顿工艺增加了有机物、关注金属和不可挥发污染物的总毒性和遗传毒性，而 A/O 工艺增加了有机物和不可挥发污染物的毒性，HOCO 工艺导致金属和不可挥发污染物的毒性更高。冬季样本的结果表明，芬顿工艺降低了不可挥发污染物引起的总毒性和遗传毒性，但增加了有机物和关注金属的毒性。A/O 工艺对冬季出水毒性的影响与夏季相同，而 HOCO 工艺增加了冬季样本中金属的总毒性和遗传毒性。相关性分析表明，各种毒性应激与废水中这些关键污染物的变化显著相关。我们的结果可为通过选择更合适的处理程序来优化工业废水处理厂（IWTP）提供参考，以降低不同污染物的毒性。
