Mechanistic insights into promoted biogas production and reduced antibiotic resistance genes’ risks of dry anaerobic digestion of organic wastes with biochar addition
Zhenqi Wang, Min Zhang, Xiaoyong Qian, Yuanzhi Ni, Xuefei Zhou, Jingren Yang
TL;DR
Adding biochar to anaerobic digestion of organic waste boosts biogas production and reduces antibiotic resistance gene risks.
Contribution
The study reveals three mechanistic pathways by which biochar enhances biogas and mitigates ARG risks.
Findings
Biochar addition increased methane yields up to 18.7 times compared to the control.
Biochar's porous structure aids in breaking down cellulose, improving hydrolysis.
Low-dose biochar suppressed Bacteroidota, reducing antibiotic resistance gene risks.
Abstract
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…
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Taxonomy
TopicsPharmaceutical and Antibiotic Environmental Impacts · Anaerobic Digestion and Biogas Production · Composting and Vermicomposting Techniques