Multi-faceted influences of biochar addition on swine manure digestion under tetracycline antibiotic pressure

[Display omitted] •Deciphering multi-faceted influences of BC addition on AD under TC pressure.•BC enhanced syntrophic methanogenesis to alleviate the inhibition caused by TC.•BC elevated TC removal efficiency by 24–158% via boosting biodegradation pathway.•BC declined ARG contents via mitigating po...

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Published in:Bioresource technology 2022-02, Vol.346, p.126352-126352, Article 126352
Main Authors: Wang, Gaojun, Chu, Yuxi, Zhu, Jinglin, Sheng, Li, Liu, Guohao, Xing, Yao, Fu, Peng, Li, Qian, Chen, Rong
Format: Article
Language:English
Subjects:
Anaerobic digestion
Anaerobiosis
Animals
Anti-Bacterial Agents - pharmacology
Antibiotic resistance genes
Biochar
Charcoal
Digestion
Manure
Microbial responses
Swine
Tetracycline
Tetracycline degradation
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Summary:[Display omitted] •Deciphering multi-faceted influences of BC addition on AD under TC pressure.•BC enhanced syntrophic methanogenesis to alleviate the inhibition caused by TC.•BC elevated TC removal efficiency by 24–158% via boosting biodegradation pathway.•BC declined ARG contents via mitigating potential host (Firmicutes) enrichment. This study explored the influence of biochar (BC) on anaerobic digestion (AD) of swine manure under various tetracycline (TC) pressures. It was found that both low (0.5 mg/L) and high (50 mg/L) TC pressures inhibited AD performance, while BC mitigated it in multi-facets. Under high TC pressure, BC accelerated syntrophic methanogenesis by boosting direct interspecies electron transfer pathway. The TC removal efficiencies were enhanced by 24.3–158.2% with BC assistance, which was attributed to the enhanced biological degradation rather than BC’s physiochemical adsorption. Moreover, BC possibly acted as a protective role to alleviate intensive extracellular polymeric substances secretion under TC pressures. Integrated microbial community, metabolic function predicting, and antibiotic resistance genes (ARG) analysis revealed that BC addition not only enriched Anaerolineceae, which likely responsible for the 24.2–41.9% higher level expression of organics metabolic pathways and xenobiotics biodegradation, but also reduced ARG abundance by controlling the potential ARG host (Firmicutes) proliferation.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2021.126352