Microbiome response to controlled shifts in ammonium and LCFA levels in co-digestion systems

Journal of Biotechnology
Leticia RegueiroJuan M Lema

Abstract

Anaerobic co-digestion using protein-rich and lipid-rich co-substrates is limited by the accumulation of ammonia and long chain fatty acids (LCFAs), which are important inhibitors of the anaerobic microorganisms. This work aimed to study the microbial community dynamics during gradual and abrupt increase in ammonium and LCFAs concentrations by applying several molecular techniques, as well as during gradual decrease. For this purpose, two anaerobic reactors co-digesting three agro-industrial wastes underwent abrupt and gradual changes of ammonium and LCFAs concentrations. Both variations provoked volatile fatty acids (VFAs) accumulation, mainly acetic acid up to 4.5gL(-1). High ammonium levels were correlated to an increase in Pseudomonadaceae, Carnobacteriaceae and Clostridiadaceae families and to a drop in Syntrophomonadaceae. However, high LCFA levels provoked an increase in the Anaerobaculaceae and Peptococcaceae families. Both perturbations resulted in greater variations in the archaeal domain, going from Methanosaeta dominance in steady state to hydrogenotrophic pathway during the disturbance periods. During the abrupt changes, Bacteria domain experienced a minimal change, which indicates the adaptation bacterial populati...Continue Reading

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Citations

Apr 18, 2019·Microbial Biotechnology·Susanne G LangerFrank R Bengelsdorf
Sep 19, 2019·Microbial Biotechnology·Nuria Fernandez-GonzalezMarta Carballa
Jun 14, 2019·Archaea : an International Microbiological Journal·Suniti SinghJukka Rintala
Nov 25, 2020·The Science of the Total Environment·Farrukh Raza AminRuihong Zhang
Nov 19, 2020·Applied Microbiology and Biotechnology·Nuria Fernandez-GonzalezM Carballa

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