Journal
BIORESOURCE TECHNOLOGY
Volume 336, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125322
Keywords
Food waste; Anaerobic digestion; Biogas slurry and residue; Antibiotics resistance genes; Bentonite
Funding
- National Key Research and Development Project of China [2019YFC1906303]
- National Natural Science Foundation of China [42007350]
- Beijing Municipal Natural Science Foundation [8202010]
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This study found that adding bentonite during anaerobic digestion of food waste can increase methane production and effectively reduce the abundance of antibiotic resistance genes (ARGs) in biogas residue. Bentonite and temperature were identified as major factors influencing the abundance of ARGs.
Anaerobic digestion (AD) processes of food waste (FW) have potential risk on environments due to the prevalence and dissemination of antibiotic resistance genes (ARGs). This study investigated the effect of bentonite on methane production and the abundance of ARGs in biogas slurry and residue during AD of FW. Results showed that methane production increased by 68.52% and 56.79% with 3 g/L and 5 g/L of bentonite in mesophilic and thermophilic digestion, respectively. Adding 5 g/L of bentonite effectively reduced the genes of ermB, ermF, tetQ, tetX, sul1, sul2 and intI1 with a range of 80.82% - 100.00% in biogas residue under mesophilic reactor. The abundance of ARGs and intI1 in biogas residue were lower than in slurry under both temperatures with 5 g/L of bentonite. Statistical analysis indicated that bentonite and temperature were main driver factors which could impact ARGs by influencing the abundance and structure of microbial communities.
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