Proportion of sewage sludge to soil influences the survival of Salmonella Dublin, and Escherichia coli

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dc.contributor.author Ellis, Stephanie
dc.contributor.author Tyrrel, Sean
dc.contributor.author O'Leary, Emma
dc.contributor.author Richards, Karl
dc.contributor.author Griffiths, Bryan
dc.contributor.author Ritz, Karl
dc.date.accessioned 2018-02-01T18:07:56Z
dc.date.available 2018-02-01T18:07:56Z
dc.date.issued 2018-01-27
dc.identifier.citation Stephanie Ellis, Sean Tyrrel, Emma O'Leary, et. al., Proportion of sewage sludge to soil influences the survival of Salmonella Dublin, and Escherichia coli. Clean - Soil, Air, Water, Volume 46, Issue 4, April 2018, article number 1800042 en_UK
dc.identifier.issn 1863-0650
dc.identifier.uri http://dx.doi.org/10.1002/clen.201800042
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/12947
dc.description.abstract The survival of enteric pathogens in sewage sludge could lead to their transferral into the soil environment and subsequent contamination of crops and water courses. This, in turn, could increase the potential spread of gastrointestinal disease. This work aimed to determine the persistence of several microorganisms, co-introduced with sewage sludge, when exposed to varying proportions of sewage sludge to soil. Three microcosm-based studies were established, inoculated with Salmonella Dublin or an environmentally-persistent strain of Escherichia coli (quantified periodically over a period of 42 days), or indigenous sewage sludge E. coli (quantified over a period of 56 days). Treatments consisted of a mixture containing: 0, 15, 25, 50, 75 and 100% soil or sludge, depending upon the experiment. Each introduced microorganism declined significantly over time, with greater quantities of soil generally instigating greater die-off particularly in the cases of environmentally-persistent E. coli and S .Dublin. However, this relationship was not proportionally related as sludge/soil mixtures showed greater declines than pure soil treatments. In contrast, indigenous sewage sludge E. coli had a more consistent decline across all treatments. This may indicate that indigenous strains are more resilient and may be indicative of natural behaviour. Moreover, the effects of soil-borne factors on pathogen attenuation were context dependent and non-linear, possibly arising from the relative spatial distribution of introduced sludge and attendant microbes in soil. en_UK
dc.language.iso en en_UK
dc.rights Attribution-NonCommercial 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc/4.0/ *
dc.subject Enteric pathogens en_UK
dc.subject Persistence en_UK
dc.subject Sewage sludge en_UK
dc.subject Soil en_UK
dc.title Proportion of sewage sludge to soil influences the survival of Salmonella Dublin, and Escherichia coli en_UK
dc.type Article en_UK


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