Role of trace elements in anaerobic digestion of food waste: Process stability, recovery from volatile fatty acid inhibition and microbial community dynamics

[Display omitted] •Scarce TEs in FW mismatched with essential TEs for sustainable methanogenesis.•VFA inhibition was accompanied by the blocked aceticlastic methanogenesis.•Dual stresses of VFA inhibition and TEs deficiency suppressed Syntrophomonadaceae.•Methanospirillum and Methanoculleus graduall...

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Published in:Bioresource technology 2020-11, Vol.315, p.123796-123796, Article 123796
Main Authors: Zhang, Wanli, Li, Lintong, Wang, Xue, Xing, Wanli, Li, Rundong, Yang, Tianhua, Lv, Dan
Format: Article
Language:English
Subjects:
Anaerobic digestion
Biogas
Food waste
Microbial community
Trace elements
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Summary:[Display omitted] •Scarce TEs in FW mismatched with essential TEs for sustainable methanogenesis.•VFA inhibition was accompanied by the blocked aceticlastic methanogenesis.•Dual stresses of VFA inhibition and TEs deficiency suppressed Syntrophomonadaceae.•Methanospirillum and Methanoculleus gradually became dominated under VFA inhibition.•TEs ensured high activity of Syntrophomonadaceae and dominant growth of Methanosaeta. Role of trace elements (TEs) in long-term anaerobic digestion of food waste (FW) under fixed and stepwise increasing loads and under early and medium volatile fatty acid (VFA) inhibition was investigated. Digesters under high load suffered VFA inhibition. Mismatch between scarce TEs in FW and essential TEs for sustainable methanogenesis suppressed Methanosaeta causing blocked aceticlastic methanogenesis and shift to CO2 reduction pathway, as indicated by decreased Methanosaeta from above 70.0% to below 42.0% and enriched hydrogenotrophic methanogens (Methanospirillum, Methanoculleus, Methanobacterium) from below 15.0% to above 53.6%. Dual stresses of VFA inhibition and TEs deficiency resulted in recession of syntrophic Bacteria Syntrophomonadaceae. Conversely, digesters with TEs supplementation maintained high activity of Syntrophomonadaceae and ensured predominant aceticlastic methanogenesis and powerful methanogenic community functions. Early and medium VFA inhibition were reversed by TEs supplementation or coupling with pH adjustment by stimulating VFAs degradation via syntrophic metabolism and unclogging acetate conversion via aceticlastic methanogenesis.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2020.123796