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<p>To explore the bioaugmentation mechanism of biogas-production promotion and risk reduction of antibiotic-resistance genes (ARGs) in the anerobic co-digestion of cattle manure and rice straw with biochar addition, the performances of digestion and productivity with different amounts of biochar additions (0, 1.25, 3.75 and 5&#xa0;g·L⁻¹ slurry) were studied. The results indicated that, biochar addition could effectively promote biogas production, and the cumulative methane (CH<sub>4</sub>) yields from the treatments with 3.75&#xa0;g·L⁻¹ slurry and 5&#xa0;g·L⁻¹ slurry biochar additions were18.7 times and 14.8 times of CK (0&#xa0;g·L⁻¹ slurry), respectively. Combined with Fourier transform infrared spectroscopy (FTIR) analysis and high-throughput sequencing-based microbial community quantification, the methanogenesis was enhanced through three possible pathways: (1) the porous structure and aromatization characteristics of biochar could promote destruction of cellulose bundle structure, thereby promoting the hydrolysis of lignocellulosic substrates; (2) Biochar regulated volatile fatty acid (VFA) concentrations within an optimal range, enhancing the buffering capacity of the anaerobic digestion system; (3) The low-dose biochar (1.25&#xa0;g·L⁻¹ slurry) achieving the optimal ARG risk mitigation by suppressing the primary ARG host <i>Bacteroidota</i>.</p> Graphical Abstract <p></p>

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Mechanistic insights into promoted biogas production and reduced antibiotic resistance genes’ risks of dry anaerobic digestion of organic wastes with biochar addition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月27日

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  • Zhenqi Wang,
  • Min Zhang,
  • Xiaoyong Qian,
  • Yuanzhi Ni,
  • Xuefei Zhou,
  • Jingren Yang

摘要

To explore the bioaugmentation mechanism of biogas-production promotion and risk reduction of antibiotic-resistance genes (ARGs) in the anerobic co-digestion of cattle manure and rice straw with biochar addition, the performances of digestion and productivity with different amounts of biochar additions (0, 1.25, 3.75 and 5 g·L⁻¹ slurry) were studied. The results indicated that, biochar addition could effectively promote biogas production, and the cumulative methane (CH4) yields from the treatments with 3.75 g·L⁻¹ slurry and 5 g·L⁻¹ slurry biochar additions were18.7 times and 14.8 times of CK (0 g·L⁻¹ slurry), respectively. Combined with Fourier transform infrared spectroscopy (FTIR) analysis and high-throughput sequencing-based microbial community quantification, the methanogenesis was enhanced through three possible pathways: (1) the porous structure and aromatization characteristics of biochar could promote destruction of cellulose bundle structure, thereby promoting the hydrolysis of lignocellulosic substrates; (2) Biochar regulated volatile fatty acid (VFA) concentrations within an optimal range, enhancing the buffering capacity of the anaerobic digestion system; (3) The low-dose biochar (1.25 g·L⁻¹ slurry) achieving the optimal ARG risk mitigation by suppressing the primary ARG host Bacteroidota.

Graphical Abstract