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Microbial metabolism regulation on the efficient degradation of aromatic compounds for biochemical treatment process of coal chemical wastewater in pilot scale
Environmental Pollution ( IF 8.9 ) Pub Date : 2023-05-22 , DOI: 10.1016/j.envpol.2023.121872
Xingshe Liu 1 , Yongjun Liu 2 , Hui Tang 1 , Aining Zhang 2 , Zhe Liu 2 , Zhihua Li 2
Affiliation  

At present, the common problems of biochemical treatment systems of coal chemical wastewater were the poor system stability and the difficulty in reaching COD discharge standards. Aromatic compounds were the main contributors to COD value. The effective removal of aromatic compounds was an urgent problem in the biochemical treatment systems of coal chemical wastewater. In this study, the dominant microbial strains that could degrade phenol, quinoline, and phenanthrene were isolated respectively and inoculated into the pilot scale biochemical tank of coal chemical wastewater. The regulation effect and mechanism of microbial metabolism on the efficient degradation of aromatic compounds were studied. The results indicated that the various aromatic compounds were significantly removed under the regulation of microbial metabolism, the removal efficiencies of COD, TOC, phenols, benzenes, N-CHs, and PAHs were increased by about 25%, 20%, 33%, 25%, 42%, and 45%, respectively, and their biotoxicity was also drastically reduced. Moreover, the abundance and diversity of microbial community, and the microbial activity were obviously improved, as well as the various functional strains were selectively enriched, suggesting that the regulation system could resist environmental stresses with high substrate concentration and toxicity, which could lead to more enhanced performance for aromatic compounds removal. In addition, the microbial EPS content was significantly increased, implying the formation of microbial hydrophobic cell surfaces, which could improve the bioavailability of aromatic compounds. Furthermore, the enzymatic activity analysis revealed that the relative abundance and activity of key enzymes were all obviously improved. In conclusion, multiple lines of evidence were provided to clarify the regulation mechanism of microbial metabolism on the efficient degradation of aromatic compounds for biochemical treatment process of coal chemical wastewater in pilot scale. The results laid a good foundation for realizing the harmless treatment of coal chemical wastewater.



中文翻译:

煤化工废水生化处理工艺高效降解芳香族化合物的微生物代谢调控中试

目前,煤化工废水生化处理系统普遍存在的问题是系统稳定性差,COD达标排放困难。芳香族化合物是 COD 值的主要贡献者。有效去除芳香族化合物是煤化工废水生化处理系统亟待解决的问题。本研究分别分离出可降解苯酚、喹啉和菲的优势微生物菌株,接种到煤化工废水中试生化池中。研究了微生物代谢对芳香族化合物高效降解的调控作用及机制。结果表明,在微生物代谢的调控下,多种芳香族化合物被显着去除,COD、TOC、酚类、苯类、N-CHs、PAHs的去除效率分别提高约25%、20%、33%、25%、42%、45%,生物毒性也大幅降低. 此外,微生物群落的丰度和多样性、微生物活性明显提高,各种功能菌株得到选择性富集,表明该调控系统能够抵抗高底物浓度和毒性的环境胁迫,从而可能导致更多增强去除芳香族化合物的性能。此外,微生物EPS含量显着增加,表明微生物细胞表面疏水性的形成,可以提高芳香族化合物的生物利用度。此外,酶活性分析表明,关键酶的相对丰度和活性均有明显提高。综上所述,为阐明微生物代谢对中试煤化工废水生化处理过程中芳香族化合物高效降解的调控机制提供了多条证据。研究结果为实现煤化工废水的无害化处理奠定了良好的基础。

更新日期:2023-05-26
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