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Aerobic Digestate Reactivation of Anaerobically Digested Sewage Sludge – A Micro Review

  • The authors of the present work summarize their recently published article “Microbiome Characterization after Aerobic Digestate Reactivation of Anaerobically Digested Sewage Sludge” from Otto et al. (2023). This article presents the outcomes of a municipal-scale demonstrator plant implementing a recently patented process for improved sludge degradation within a municipal sewage treatment system. The study focused on a 1500 m³ sewage sludge digester, where an intermediate aerobic sewage sludge reactivation stage was introduced. This reactivation resulted in a 55% increase in biogas production and a 25% reduction in residual solids. For the residual NH4 in the liquid phase of the sewage sludge, the process achieved NH4-N removal rates exceeding 90%. To gain insights into the microbial community dynamics, 16S rRNA gene amplicon high-throughput sequencing was employed on the reactivated digestate. The analysis revealed a reduced population of methane-forming archaea compared to the primary digester, along with the detection of multipleThe authors of the present work summarize their recently published article “Microbiome Characterization after Aerobic Digestate Reactivation of Anaerobically Digested Sewage Sludge” from Otto et al. (2023). This article presents the outcomes of a municipal-scale demonstrator plant implementing a recently patented process for improved sludge degradation within a municipal sewage treatment system. The study focused on a 1500 m³ sewage sludge digester, where an intermediate aerobic sewage sludge reactivation stage was introduced. This reactivation resulted in a 55% increase in biogas production and a 25% reduction in residual solids. For the residual NH4 in the liquid phase of the sewage sludge, the process achieved NH4-N removal rates exceeding 90%. To gain insights into the microbial community dynamics, 16S rRNA gene amplicon high-throughput sequencing was employed on the reactivated digestate. The analysis revealed a reduced population of methane-forming archaea compared to the primary digester, along with the detection of multiple ammonium-oxidizing bacteria. Notably, genera within the Chitinophagaceae family, comprising up to 18.8% of DNA sequences, were prevalent, alongside a small presence of Candidatus nitrosoglobus (<0.3%). The study highlights an economically viable approach for efficient nitrogen removal from sewage sludge while simultaneously increasing biogas yields and reducing potential pathogens in the residual material.show moreshow less

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Metadaten
Author: Mozhdeh Alipoursarbani, Christian AbendrothORCiD
DOI:https://doi.org/10.15203/99106-120-5
ISBN:978-3-99106-120-5
Title of the source (German):Kreislauf und Ressourcenwirtschaft : 13.Wissenschaftskongress : am 15. und 16. Februar 2024 an der Technischen Universität Wien
Publisher:Innsbruck university press
Place of publication:Innsbruck
Editor: Anke Bockreis, Martin Faulstich, Sabine Flamme, Martin Kranert, Mario Mocker, Michael Nelles, Peter Quicker, Gerhard Rettenberger, Vera Susanne Rotter
Document Type:Conference publication not peer-reviewed
Language:English
Year of publication:2024
Contributing Corporation:Deutsche Gesellschaft für Abfallwirtschaft e.V.
Tag:Biogas; Mikrobiome
Sewage Sludge
First Page:177
Last Page:180
Way of publication:Open Access
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Kreislaufwirtschaft
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