Journal
BIORESOURCE TECHNOLOGY
Volume 315, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123796
Keywords
Anaerobic digestion; Food waste; Biogas; Trace elements; Microbial community
Funding
- National Natural Science Foundation of China [51808350]
- Liaoning Revitalization Talents Program [XLYC1907114]
- Natural Science Foundation of Liaoning Province [2019-MS-255, 20180551004, 20180550834]
- Scientific Research Starting Foundation for Doctor of Liaoning Province [2019-BS-183]
- National Key Research and Development Program Project of China [2019YFC1903901]
- Outstanding Chinese and Foreign Youth Exchange Program of China Association of Science and Technology
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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.
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