Key microbial communities steering the functioning of anaerobic digesters during hydraulic and organic overloading shocks

Bioresource Technology
Leticia RegueiroMarta Carballa

Abstract

Overloading is one of the most typical process disturbance in anaerobic digesters, resulting in volatile fatty acids (VFAs) accumulation. This work aimed to study the microbial community dynamics during hydraulic (decreasing the hydraulic retention time (HRT)) and organic (increasing the organic loading rate maintaining the HRT constant) overload shocks in anaerobic reactors treating agro-industrial wastes, as well as during the recovery period. In both cases, the organic loading rate increased from 2 to 10gCODL(-1)d(-1), resulting in VFAs accumulation up to 9gL(-1). Both overloads were correlated to an increase in Bacteroidetes and Actinobacteria phyla and with a drop in Syntrophomonadaceae and Pseudomonadaceae families. In contrast, Tissierellaceae family only increased during the organic shock. Active Archaea decreased in both overloads, going from Methanosaeta dominance to Methanosarcina prevalence. During the recovery period, Porphyromonadaceae family increased its presence and Clostridium genus recovered values prior to perturbation.

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Citations

May 30, 2014·Journal of Environmental Health Science & Engineering·Elif SenturkGuleda Onkal Engin
May 28, 2016·Bioresource Technology·Céline MadigouOlivier Chapleur
Feb 16, 2017·Environmental Science & Technology·Lorena Gonzalez-GilJuan M Lema
Feb 7, 2017·Biotechnology for Biofuels·Alberto ScomaKorneel Rabaey
Sep 19, 2019·Microbial Biotechnology·Nuria Fernandez-GonzalezMarta Carballa
Jul 5, 2018·International Journal of Environmental Research and Public Health·Nsanzumukiza Martin VincentJuan Tong
Oct 3, 2018·Applied Microbiology and Biotechnology·G H R BrazM Carballa
Feb 11, 2020·Applied Microbiology and Biotechnology·Rosa MarchettiFrancesca Fiume
Sep 19, 2020·Bioresource Technology·Brian Dahl JønsonJin Mi Triolo
Jul 29, 2021·Critical Reviews in Biotechnology·Rosina NkunaRasheed Adeleke
Jul 18, 2017·Bioresource Technology·Lei LiDi Wu

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