Microbial dynamics in anaerobic digestion reactors for treating organic urban residues during the start-up process

Alcántara-Hernández, Rocı́o; Taş, Neslihan; Carlos-Pinedo, Sandra; Durán-Moreno, Alfonso; Falcón, Luisa I.

doi:10.1111/lam.12734

Cited by 30 publications

(18 citation statements)

References 30 publications

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“…On the last day of each tested OLR, the number of microbes was determined from fluorescence images in the inoculum and at 75, 175, and 250 days after starting the experiment (Figure 6). The mean number of microorganisms decreased from 12,761 ± 3213 cells/mm 2 in the inoculum to 7126 ± 3099 cells/mm 2 after 75 days (Figure 7) as a result of a process of selection by the substrate [31]. The number of microbes was no different at day 175 (5739 ± 1316 cells/mm 2 ) from day 75, which suggests that the rate of duplication met an equilibrium with the OLR.…”

Section: Microbiology Assessmentmentioning

confidence: 92%

Long-Term Evaluation of Mesophilic Semi-Continuous Anaerobic Digestion of Olive Mill Solid Waste Pretreated with Steam-Explosion

et al. 2019

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Steam-explosion is a promising technology for recovering phenolic compounds from olive mill solid waste (OMSW) due to its high impact on the structure of the fibre. Moreover, the recovery of the phenols, which are well-known microbial inhibitors, could improve the subsequent biomethanization of the dephenolized OMSW to produce energy. However, there is a considerable lack of knowledge about how the remaining phenolic compounds could affect a long-term biomethanization process of steam-exploded OMSW. This work evaluated a semi-continuous mesophilic anaerobic digestion of dephenolized steam-exploited OMSW during a long operational period (275 days), assessing different organic loading rates (OLRs). The process was stable at an OLR of 1 gVS/(L·d), with a specific production rate of 163 ± 28 mL CH4/(gVS·d). However, the increment of the OLR up to 2 gVS/(L·d) resulted in total exhaust of the methane production. The increment in the propionic acid concentration up to 1486 mg/L could be the main responsible factor for the inhibition. Regardless of the OLR, the concentration of phenolic compounds was always lower than the inhibition limits. Therefore, steam-exploited OMSW could be a suitable substrate for anaerobic digestion at a suitable OLR.

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Section: Microbiology Assessmentmentioning

confidence: 92%

Long-Term Evaluation of Mesophilic Semi-Continuous Anaerobic Digestion of Olive Mill Solid Waste Pretreated with Steam-Explosion

et al. 2019

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“…The reactors were operated for still one more year after the last sampling time reported here, and we observed that the granules remained as a stable part of the reactors’ sludge beds, accounting for around half of the total solids (data not shown). Other studies have reported major changes in granular species inventory due to other kinds of adaptation 13 , 14 , but they did not comment on granule abundance in the reactors after completing the adaptation. Another surprising observation is that the methanogenic community that finally handled extreme ammonia levels after a year of adaptation (HA1) was more similar to the inoculum community from a process with very low ammonia (PP) than with the culture that adapted to an ammonia level that can cause moderate inhibition (LA1).…”

Section: Discussionmentioning

confidence: 94%

Mapping anaerobic sludge bed community adaptations to manure supernatant in biogas reactors

Nordgård

Bergland

Bakke

et al. 2018

Sci Rep

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In upflow anaerobic sludge bed (UASB) reactors, biomass present as granules allows for long solids retention time. Here, granules from a process treating pulp and paper industrial wastewater were successfully applied as inoculum in UASB reactors treating pig manure supernatant, despite high particle content and high ammonium concentrations in the influent. We did a detailed characterization of archaeal and bacterial communities associated with the inoculum and with the aggregated and dispersed fractions of the influent and the reactors after one year of operation. The granular communities underwent major changes and adapted to the highly distinct conditions without disintegration of the granules. Although the granules persisted in the reactors, non-granular aggregates accumulated, and partly replaced the granules. Particles introduced to the reactors by the pig manure influent apparently contributed both as food and biofilm growth support. Archaeal communities in the dispersed reactor phase were similar to those dispersed in the influents, implying successful retention and little loss of archaeal biomass due to detachment or disintegration of granules and other aggregates. Unique bacterial communities developed in the dispersed fraction of the reactors despite of low hydraulic retention times. They probably consisted of fast growing organisms consuming readily degradable organic matter.

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“…Anaerobic digestion has gained increasing interest both as an efficient way of treating wastes and as a source of renewable energy . During anaerobic digestion, bacterial communities biotransform the substrate to alcohols, CO 2 , H 2 , and volatile fatty acid (VFA) by hydrolysis and acidogenesis processes.…”

Section: Introductionmentioning

confidence: 99%

Biogas production and microbial community structure in a stable‐stage of a two‐stage anaerobic digester

et al. 2019

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In a pilot plant under the stable-stage of the two-stage anaerobic digester, the dynamic of the archaeal, bacterial, and eukaryal community structure was studied as well as their link to performance and biogas production. An effective synergic action between microorganisms was reached since biogas production and particularly methane (CH 4) generation, were more than two-times higher in the methanogenic respect to the acidogenic bioreactor. The αand β-diversity analyses showed that dominant and rare operational taxonomic units of prokaryotic and eukaryotic microorganisms were critical in developing a functional successful anaerobic digestion process. A canonical correspondence analysis showed that acid/alkalinity ratio, volatile fatty acid, and pH parameters mainly affected prokaryotic and eukaryotic phylotypes and a clear positive relationship was found between several phylotypes, such as Methanobacteriaceae, Unknown Thaumarchaeota, Intestinibacter, Coprothermobacter, and Magnoliophyta, with biogas and CH 4 production and performance parameters.

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Microbial dynamics in anaerobic digestion reactors for treating organic urban residues during the start-up process

Cited by 30 publications

References 30 publications

Long-Term Evaluation of Mesophilic Semi-Continuous Anaerobic Digestion of Olive Mill Solid Waste Pretreated with Steam-Explosion

Long-Term Evaluation of Mesophilic Semi-Continuous Anaerobic Digestion of Olive Mill Solid Waste Pretreated with Steam-Explosion

Mapping anaerobic sludge bed community adaptations to manure supernatant in biogas reactors

Biogas production and microbial community structure in a stable‐stage of a two‐stage anaerobic digester

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