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Review
. 2021 Jan;105(1):21-33.
doi: 10.1007/s00253-020-11009-9. Epub 2020 Nov 18.

Microbial invasions in sludge anaerobic digesters

Nuria Fernandez-Gonzalez  1   2 , G H R Braz  3   4 , L Regueiro  5 , J M Lema  3 , M Carballa  3
Affiliations
Review

Microbial invasions in sludge anaerobic digesters

Nuria Fernandez-Gonzalez et al. Appl Microbiol Biotechnol. 2021 Jan.

Abstract

Among processes that control microbial community assembly, microbial invasion has received little attention until recently, especially in the field of anaerobic digestion. However, knowledge of the principles regulating the taxonomic and functional stability of microbial communities is key to truly develop better predictive models and effective management strategies for the anaerobic digestion process. To date, available studies focus on microbial invasions in digesters feed with activated sludge from municipal wastewater treatment plants. Herein, this review summarizes the importance of invasions for anaerobic digestion management, the ecological theories about microbial invasions, the traits of activated sludge microorganisms entering the digesters, and the resident communities of anaerobic reactors that are relevant for invasions and the current knowledge about the success and impacts of invasions, and discusses the research needs on this topic. The initial data indicate that the impact of invasions is low and only a small percentage of the mostly aerobic microorganisms present in the activated sludge feed are able to become stablished in the anaerobic digesters. However, there are still numerous unknowns about microbial invasions in anaerobic digestion including the influence of anaerobic feedstocks or process perturbances that new approaches on microbial ecology could unveil. KEY POINTS: • Microbial invasions are key processes to develop better strategies for digesters management. • Knowledge on pathogen invasions can improve anaerobic digestion microbial safety. • To date, the number of successful invasions on anaerobic digesters from activated sludge organisms is low. • Feed organisms detected in digesters are mostly inactive residual populations. • Need to expand the range of invaders and operational scenarios studied.

Keywords: Activated sludge; Anaerobic digestion; Community assembly process; Management; Microbial invasions; Municipal wastewater treatment plant.

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References

    1. Acosta F, Zamor RM, Najar FZ, Roe BA, Hambright KD (2015) Dynamics of an experimental microbial invasion. Proc Natl Acad Sci U S A 112:11594–11599. https://doi.org/10.1073/pnas.1505204112 - DOI - PubMed - PMC
    1. Ali M, Wang Z, Salam KW, Hari AR, Pronk M, van Loosdrecht MCM, Saikaly PE (2019) Importance of species sorting and immigration on the bacterial assembly of different-sized aggregates in a full-scale aerobic granular sludge plant. Environ Sci Technol 53:8291–8301. https://doi.org/10.1021/acs.est.8b07303 - DOI - PubMed
    1. Allison SD, Martiny JBH (2008) Resistance, resilience, and redundancy in microbial communities. Proc Natl Acad Sci USA 105:11512–11519 - DOI
    1. Bae S, Wuertz S (2009) Discrimination of viable and dead fecal Bacteroidales bacteria by quantitative PCR with propidium monoazide. Appl Environ Microbiol 75:2940–2944. https://doi.org/10.1128/AEM.01333-08 - DOI - PubMed - PMC
    1. Berglund B (2015) Environmental dissemination of antibiotic resistance genes and correlation to anthropogenic contamination with antibiotics. Infect Ecol Epidemiol 5:28564. https://doi.org/10.3402/iee.v5.28564 - DOI - PubMed

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