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dc.contributor.authorSvennevik, Oda K.
dc.contributor.authorJonassen, Kjell Rune
dc.contributor.authorSvensson, Kine
dc.contributor.authorHagen, Live Heldal
dc.contributor.authorWestereng, Bjørge
dc.contributor.authorSolheim, Odd Egil
dc.contributor.authorNilsen, Pål Jahre
dc.contributor.authorHorn, Svein Jarle
dc.contributor.authorBakken, Lars
dc.date.accessioned2021-11-15T18:08:39Z
dc.date.available2021-11-15T18:08:39Z
dc.date.created2021-01-18T09:56:47Z
dc.date.issued2020
dc.identifier.issn1877-2641
dc.identifier.urihttps://hdl.handle.net/11250/2829694
dc.description.abstractSludge biosolids for agricultural application represent a valuable fertilizer but also a health risk unless pathogens are effectively reduced, and recontamination controlled. The Post Anaerobic Digestion Thermal Hydrolysis Process (Post-AD THP) is gaining interest due to improved dewaterability, reducing the volume and thus transportation costs of biosolids. However, Post-AD THP results in sterile biosolids easily exposed to recontamination by pathogens due to the lack of microbial competitors. In theory, this could be suppressed by establishing a competing community of harmless bacteria. The theory was tested by monitoring the abundance of Escherichia coli (viable counts) and gene abundance (ddPCR) in wastewater recontaminated Post-AD THP biosolids, with and without addition of compost. Respiration, total bacterial population and bacterial diversity (16S rRNA amplicon sequencing) were used to monitor the microbial community. Biosolids from the regulatory approved methods thermophilic AD (TAD) and Pre-AD THP were tested in parallel for comparison. The results demonstrated that regulatory requirements can be reached by storing the TAD and Pre-AD THP biosolids for 3 days after recontamination and the Post-AD THP biosolids for more than 13 days. However, addition of compost suppressed growth of E. coli in Post-AD THP biosolids, reducing the time to comply with regulative requirements. In conclusion, pathogen growth in Post-AD THP biosolids can be controlled by inoculation with compost.
dc.language.isoeng
dc.titleProtecting Thermally Hydrolyzed Biosolids from Pathogenic Bacterial Growth by Addition of Compost
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersion
dc.source.journalWaste and Biomass Valorization
dc.identifier.doi10.1007/s12649-020-01300-1
dc.identifier.cristin1872877
dc.relation.projectNorges forskningsråd: 258749
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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