Enhanced bioremediation of sediment contaminated with polycyclic aromatic hydrocarbons by combined stimulation with sodium acetate/phthalic acid

被引:22
作者
Wang, Feng [1 ,2 ]
Dong, Wenyi [1 ,2 ,3 ]
Wang, Hongjie [1 ,2 ]
Zhao, Yue [1 ]
Zhao, Zilong [1 ,2 ]
Huang, Jie [1 ]
Zhou, Ting [1 ]
Wu, Zijing [1 ]
Li, Wenting [1 ]
机构
[1] Harbin Inst Technol Shenzhen, Sch Civil & Environm Engn, Shenzhen 518055, Peoples R China
[2] Shenzhen Key Lab Water Resource Utilizat & Enviro, Shenzhen 518055, Peoples R China
[3] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
关键词
PAHs biodegradation; Co-substrate; Microbial community; Microbial interaction; Metabolic characteristic; RIVER SEDIMENT; PETROLEUM-HYDROCARBONS; PAHS; BIODEGRADATION; DEGRADATION; COSUBSTRATE; BIOSTIMULATION; CONSORTIUM; COMMUNITY; FIELD;
D O I
10.1016/j.chemosphere.2021.132770
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this study, four groups of laboratory scale experiments were performed by adding sodium acetate (SA), phthalic acid (PA), and SA-PA to river sediment to observe the microbial response and biodegradation efficiency of polycyclic aromatic hydrocarbons (PAHs). The results showed that the amount of total organic carbon consumed and the amount of sulfate reduction were both positively correlated (p < 0.01) with the biodegradation efficiency of the sum (Sigma) PAHs (similar to 40.5%). The lower the number of rings, the more PAHs were biodegraded, with an efficiency of 63.0% for Sigma (2 + 3) ring PAHs. Based on high-throughput sequencing and molecular ecological network analysis, it was found that the combined stimulation of SA and PA not only increased the relative abundance of PAHs-degrading bacterial (eg., Proteobacteria, Desulfobacterota, Campilobacterota and Firmicutes), but also had a strengthening effect on microbes in sediments. The altered microbial structure caused a variation in metabolic functions, which increased the amino acid metabolism to 12.2%, thus increasing the positive correlations among genera and improving the connectivity of the microbial network (p < 0.01). These changes may be responsible for the enhanced biodegradation of PAHs under SA-PA dosing in comparison to SA or PA dosing alone. This study revealed that the microbial community was stimulated by the combined addition of SA and PA, and indicated its role in enhancing biodegradation of PAHs in contaminated river sediments.
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页数:9
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