Microbiome Characterization after Aerobic Digestate Reactivation of Anaerobically Digested Sewage Sludge

Author:

Otto Pascal1,Alipoursarbani Mozhdeh2,Torrent Daniel3ORCID,Latorre-Pérez Adriel3ORCID,Paust Thomas4,Albert Alfred4,Abendroth Christian2ORCID

Affiliation:

1. Institute of Waste Management and Circular Economy, Technische Universität Dresden, 01796 Pirna, Germany

2. Brandenburgische Technische Universität Cottbus-Senftenberg, 03046 Cottbus, Germany

3. Darwin Bioprospecting Excellence, S.L. Parc Científic de la Universitat de Valencia, 46980 Paterna, Spain

4. PRO-Entec East GmbH Bio Engineering, 16928 Gerdshagen, Germany

Abstract

A demonstrator plant of a recently patented process for improved sludge degradation has been implemented on a municipal scale. In a 1500 m3 sewage sludge digester, an intermediary stage with aerobic sewage sludge reactivation was implemented. This oxic activation increased the biogas yield by up to 55% with a 25% reduction of the remaining fermentation residue volume. Furthermore, this process allowed an NH4-N removal of over 90%. Additionally, 16S rRNA gene amplicon high-throughput sequencing of the reactivated digestate showed a reduced number of methane-forming archaea compared to the main digester. Multiple ammonium-oxidizing bacteria were detected. This includes multiple genera belonging to the family Chitinophagaceae (the highest values reached 18.8% of the DNA sequences) as well as a small amount of the genus Candidatus nitrosoglobus (<0.3%). In summary, the process described here provides an economically viable method to eliminate nitrogen from sewage sludge while achieving higher biogas yields and fewer potential pathogens in the residuals.

Funder

European Union’s Horizon 2020

Publisher

MDPI AG

Subject

Plant Science,Biochemistry, Genetics and Molecular Biology (miscellaneous),Food Science

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