Cumulative effects and metabolic characteristics of aromatic compounds in microbial cells during the biochemical treatment process of coal chemical wastewater
Cumulative effects and metabolic characteristics of aromatic compounds in microbial cells during the biochemical treatment process of coal chemical wastewater
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DOI：
10.1016/j.cej.2023.144307
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发表时间：
2023-09
影响因子：
15.1
通讯作者：
Lu Yang;Y. Liu;Aining Zhang;Zhe Liu;Zhuangzhuang Yang;Chunxiao Wei;Zhi-Hua Li
中科院分区：
文献类型：
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作者：
Lu Yang;Y. Liu;Aining Zhang;Zhe Liu;Zhuangzhuang Yang;Chunxiao Wei;Zhi-Hua Li
研究了煤化工废水生化处理系统对芳香族化合物的降解效果。研究了不同化合物的降解顺序，包括苯系物（BTEX），苯酚，多环芳烃（PAHs），氮杂环化合物（NHC），在系统中。该研究还分析了微生物细胞中积累的芳香族有机化合物的代谢特征。结果表明，芳香族化合物在进入细胞之前首先被胞外聚合物（EPS）从水中吸附。系统运行8h后，CCW中COD和TOC的去除率达到95%以上。BTEX和NHC在细胞外2 h内完全降解，而多环芳烃和一些酚类物质在细胞内积累。对积累化合物的代谢特征进行了分析，发现其通过邻苯二酚双加氧酶的作用逐渐降解。研究结果不仅证明了实现有效生物降解的芳香族化合物在CCW的潜力，但也提供了必要的理论基础的监管和环境友好的生化处理系统内的废水处理。
This study aimed to investigate the effectiveness of a biochemical treatment system for coal chemical wastewater (CCW) in degrading aromatic compounds. The study examined the degradation sequence of different compounds, including benzene series (BTEX), phenols, polycyclic aromatic hydrocarbons (PAHs), and nitrogen heterocyclic compounds (NHCs), in the system. The study also analyzed the metabolic characteristics of accumulated aromatic organic compounds in the cells of microorganisms. The results showed that the aromatic compounds were first adsorbed from water by extracellular polymers (EPS) before entering the cells. The removal rates of COD and TOC in CCW reached 95% after system operation for 8 h. BTEX and NHCs were completely degraded outside the cells within 2 h, whereas PAHs and some phenols accumulated inside the cells. The metabolic characteristics of the accumulated compounds were analyzed and found to be gradually degraded through the action of catechol dioxygenase. The study findings not only demonstrate the potential for achieving efficient biodegradation of aromatic compounds in CCW but also provide the essential theoretical underpinning for the regulation and environmentally benign treatment of such wastewater within a biochemical treatment system.