Effects of high-concentration sulfamethoxazole on antibiotic resistance genes during swine manure aerobic composting

文献类型： 外文期刊

第一作者： Ma, Shuangshuang

作者： Ma, Shuangshuang;Ding, Jingtao;Zhou, Haibin;Shen, Yujun;Wang, Jian;Chen, Yanxin;Yang, Yan;Ma, Shuangshuang;Ding, Jingtao;Zhou, Haibin;Shen, Yujun;Wang, Jian;Chen, Yanxin;Yang, Yan;Wang, Li;Wang, Li

作者机构：

关键词： Sulfamethoxazole; Aerobic composting; Antibiotic resistance gene; Microbial community; Mobile genetic element

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 4 期

页码：

收录情况： SCI

摘要： Sulfamethoxazole (SMX) is a common antibiotic used in animal manure with high stability and a long half-life. The long-term presence of SMX in animal manure affects the resource utilization of feces and leads to the continuous enrichment and expression of antibiotic resistance genes (ARGs), which pose a serious threat to ecosystems. Aerobic composting is an effective method for reducing SMX and ARGs in manure. However, the impact of higher concentrations of SMX in livestock manure on the reduction of ARGs during aerobic composting remains unclear. This study explored the effects of higher SMX concentrations on the reduction of ARGs during aerobic swine manure composting. The results showed that the degradation rate of SMX reached 97.78 % after composting and the total ARG reduction rate under SMX treatment decreased by 12.71 % compared with that of the control, indicating that the presence of SMX was not conducive to the reduction of total ARGs. Moreover, the abundances of sulfonamide resistance genes sul1, sul2 and sul4 decreased but sul3 increased. Temperature, moisture content, carbon-nitrogen ratio, Actinomadura, Ruminofilibacter, and integrative conjugative elements were the key factors affecting the reduction of total ARGs. Further analysis using partial least squares path modeling revealed that SMX mainly reduced the vertical or horizontal transfer risk of total ARGs by altering the microorganisms and integrative conjugative elements. In summary, the presence of SMX in manure increases the risk of ARG transmission in compost products. These results have theoretical and experimental implications for controlling typical antibiotic pollution in livestock manure.

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