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Evaluation of the removal of indicator bacteria from domestic sludge processed by autothermal thermophilic aerobic digestion (ATAD)

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Show simple item record Piterina, Anna Valentinova Bartlett, John Pembroke, Tony J. 2014-08-22T13:04:08Z 2014-08-22T13:04:08Z 2010
dc.description peer-reviewed en_US
dc.description.abstract The degradation of sludge solids in an insulated reactor during Autothermal Thermophilic Aerobic Digestion (ATAD) processing results in auto-heating, thermal treatment and total solids reduction, however, the ability to eliminate pathogenic organisms has not been analysed under large scale process conditions. We evaluated the ATAD process over a period of one year in a two stage, full scale Irish ATAD plant established in Killarney and treating mixed primary and secondary sludge, by examining the sludge microbiologically at various stages during and following ATAD processing to determine its ability to eliminate indicator organisms. Salmonella spp. (pathogen) and fecal-coliform (indicator) densities were well below the limits used to validate class A biosolids in the final product. Enteric pathogens present at inlet were deactivated during the ATAD process and were not detected in the final product using both traditional microbial culture and molecular phylogenetic techniques. A high DNase activity was detected in the bulk sludge during the thermophilic digestion stage which may be responsible for the rapid turn over of DNA from lysed cells and the removal of mobile DNA. These results offer assurance for the safe use of ATAD sludge as a soil supplement following processing. en_US
dc.language.iso eng en_US
dc.publisher MDPI en_US
dc.relation.ispartofseries International Journal of Environmental Research and Public Health;7, pp. 3422-3441
dc.subject domestic sludge en_US
dc.subject safety en_US
dc.subject pathogen detection and inactivation en_US
dc.subject ATAD treatment efficiency en_US
dc.subject mobile element inactivation en_US
dc.subject SXT/R391 en_US
dc.subject DNases en_US
dc.title Evaluation of the removal of indicator bacteria from domestic sludge processed by autothermal thermophilic aerobic digestion (ATAD) en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.contributor.sponsor HEA en_US
dc.relation.projectid PRTLI 4 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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