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Hydroxyl radicals dominated the reduction of antibiotic resistance genes by inactivating Gram-negative bacteria during soil electrokinetic treatment

文献类型： 外文期刊

作者： Li, Binxu 1 ; Jiang, Kaiyang 1 ; Song, Tingting 1 ; Yan, Mengmeng 1 ; Li, Na 1 ; Yang, Zhenzhen 1 ; Zhu, Changxiong 1 ; Li, Hongna 1 ;

作者机构： 1.Inst Environm & Sustainable Dev Agr, Chinese Acad Agr Sci, Beijing 100081, Peoples R China

2.Jilin Normal Univ, Coll Engn, Siping 136000, Jilin, Peoples R China

3.North Minzu Univ, Ningxia Key Lab Dev & Applicat Microbial Resources, Yinchuan 750021, Ningxia Hui Aut, Peoples R China

关键词： Electrokinetic remediation; Hydroxyl radicals; Gram-negative bacteria; sul genes

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）

ISSN： 0301-4797

年卷期： 2024 年 370 卷

页码：

收录情况： SCI

摘要： Antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) are emerging contaminants that widely exist in the environment. Effective reduction of ARB and ARGs from soil and water could be achieved by electrokinetic remediation (EKR) technology. In water, hydroxyl radicals (center dot OH) are proved to play a major role in the EKR process; while the reduction mechanism of ARB and ARGs is still unclear in soil. In this study, different concentrations of hydroxyl radical scavengers (salicylic acid) were added to the EKR system to explore the possible role of center dot OH in the reduction of ARB and ARGs. The results showed that generally, center dot OH played a more vital role in the reduction of ARB (65.24-72.46%) compared to the reduction of total cultivable bacteria (57.50%). And center dot OH contributed to a higher reduction of sul genes (60.94%) compared to tet genes (47.71%) and integrons (36.02%). It was found that the abundance of Gram-negative bacteria (Chloroflexi, Acidobacteria and norank_c_Acidobacteria) was significantly reduced, and the correlation between norank_f_Gemmatimonadaceae and sul1 was weakened in the presence of center dot OH. Correlation analysis indicated that the abundance of ARGs (especially sul1) was closely related to the Gram-negative bacteria (Proteobacteria, Acidobacteria, and Gemmatimonadetes) in the soil EKR treatment. Moreover, changes in bacterial community structure affected the abundance of ARB and ARGs indirectly. Overall, this study revealed the reduction mechanism of ARB and ARGs by center dot OH in the soil EKR system for the first time. These findings provide valuable support for soil remediation efforts focusing on controlling antibiotic resistance.

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