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

Bioresource Technology
Wanli ZhangDan Lv

Abstract

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.

References

Dec 19, 2008·The Science of the Total Environment·Fernando G FermosoPiet N L Lens
Nov 22, 2011·Bioresource Technology·Charles J BanksSonia Heaven
Apr 28, 2012·Waste Management·Lei Zhang, Deokjin Jahng
Sep 17, 2013·Archives of Biochemistry and Biophysics·Jodi L BoerRobert P Hausinger
Jul 24, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wanli ZhangAimin Li
Dec 29, 2015·Biotechnology Advances·Pham Minh ThanhDavid Stuckey
Jul 14, 2018·Bioresource Technology·Jae Hac KoQiyong Xu

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