Dual character of methane production improvement and antibiotic resistance genes reduction by nano-Fe2O3 addition during anaerobic digestion of swine manure

文献类型： 外文期刊

第一作者： Lu, Tiedong

作者： Lu, Tiedong;Wei, Yuansong;Zhang, Junya;Lu, Tiedong;Su, Tianming;He, Tieguang;Zhang, Junya;Wei, Yuansong;Zhang, Junya;Liang, Xuelian

作者机构：

关键词： Swine manure; Anaerobic digestion; Microbial community; Antibiotic resistance genes

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：11.072； 五年影响因子：11.016 ）

ISSN： 0959-6526

年卷期： 2022 年 376 卷

页码：

收录情况： SCI

摘要： In this study, the dual character of the methane production and fate of antibiotic resistance genes (ARGs) were evaluated after adding nano-Fe2O3 (NF) during anaerobic digestion (AD) of swine manure, concerning the different exposure times (ET). NF has a decreasing effect on methane production, and the inhibitory effect is proportional to the dosage. NF350 decreased the accumulative methane production by about 7.8% when the ET was 30 days due to the disruption of cellular integrity and the damage to the bacterial communities. Nonetheless, NF could improve the maximum specific methane production rate by up to 24.5% when the ET was shorter than 12 days. And the changes in the relative abundance of ARGs were proportional to the daily methane production at this stage. The addition of NF in a short time is helpful for methanogenic activities, which might be correlated with direct interspecies electron transfer (DIET). NF specifically enhanced the reduction of tetracycline resistance genes with antibiotic target protection (40.7%) and aminoglycoside resistance genes with antibiotic inactivation (34.0%) when the ET was 30 days. It was speculated that the specifical reduction was mainly due to that higher NF could produce the ROS (reactive oxygen species), down regulate key enzyme actions in phosphorylation, acetylization, and nucelotidylalation with antibiotic inactivation, and reduces the reduction of selective pressure for tetracycline. Environmental variables and microbial community were the major factors causing the changes of the ARGs by Structural equation models (SEM) and Procrustes analysis. These results illustrated that resonable NF addition could help to improve the accumulative methane production and reduce ARGs during AD of swine manure.

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