Impact of heat pre-treatment on microbial succession and antibiotic resistance gene spread in high-solid anaerobic digestion of pig manure

文献类型： 外文期刊

第一作者： Wang, Jianlin

作者： Wang, Jianlin;Wang, Ming;Li, Yunting;Peng, Hao;Liu, Kai;Wang, Qingjie;Wang, Jianlin;Wang, Ming;Xu, Minghan

作者机构：

关键词： Anaerobic digestion; Heat pre-treatment; Pig manure; Microbial community; Antibiotic resistance gene

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 521 卷

页码：

收录情况： SCI

摘要： Two semi-continuous high-concentration anaerobic digestion (AD) trials were conducted over 70 days, during which the organic loading rate (OLR) was gradually increased from 3.33 to 9.30 g volatile solids L- 1 d- 1, aiming to investigate the effects of heat pre-treatment (HPT) on microbial succession and the dissemination of antibiotic resistance genes (ARGs) during high-solid AD of pig manure (PM). The reactor treating heat-pretreated PM achieved a maximum specific biogas yield of 484.81 mL g- 1 VS, which was 55.75 % higher than that of the untreated control. HPT promoted the proliferation of the bacterial phylum Patescibacteria and the hydrogenotrophic archaeal genus Methanobacterium, facilitating syntrophic methanogenesis. KEGG pathway enrichment analysis indicated that HPT upregulated genes associated with COQ-reducing methanogenesis and the biosynthesis of cofactors such as coenzyme F420 and methanofuran. ARG profiling revealed that both AD and HPT effectively suppressed the spread of ARGs, primarily by reducing the relative abundance of key microbial hosts such as Firmicutes. Overall, this study provides valuable insights into optimizing AD performance and microbial community structure while mitigating the environmental risks associated with ARG dissemination in PM.

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