Risk assessment of E. coli survival up to the grazing exclusion period after dairy slurry, cattle dung, and biosolids application to grassland

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dc.contributor.authorAshekuzzaman, S. M.
dc.contributor.authorRichards, Karl
dc.contributor.authorEllis, Stephanie
dc.contributor.authorTyrrel, Sean
dc.contributor.authorO'Leary, Emma
dc.contributor.authorGriffiths, Bryan
dc.contributor.authorRitz, Karl
dc.contributor.authorFenton, Owen
dc.date.accessioned2018-07-10T10:17:39Z
dc.date.available2018-07-10T10:17:39Z
dc.date.issued2018-07-10
dc.description.abstractGrassland application of dairy slurry, cattle dung and biosolids offers an opportunity to recycle valuable nutrients (N, P and K), which may all introduce pathogens to the soil environment. Herein, a temporal risk assessment of the survival of Escherichia coli (E. coli) up to 40 days in line with the legislated grazing exclusion time points after application was examined across six scenarios: (1) soil and biosolids mixture, (2) biosolids amended soil, (3) dairy slurry application, (4) cattle dung on pasture, (5) comparison of scenario 2, 3 and 4, and (6) maximum legal vs. excess rate of application for scenario 2 and 3. The risk model input parameters were taken or derived from regressions within the literature and an uncertainty analysis (n=1000 trials for each scenario) was conducted. Scenario 1 results showed that E. coli survival was higher in the soil/biosolids mixture for higher biosolids portion, resulting in the highest 20 day value of residual E. coli concentration (i.e. C20, log10CFU g−1dw) of 1.0 in 100% biosolids or inoculated soil and the lowest C20 of 0.098 in 75/25 soil/biosolids ratio, respectively, in comparison to an average initial value of ~6.4 log10CFU g−1dw. The E. coli survival across scenario 2, 3 and 4 showed that the C20 value of biosolids (0.57 log10CFU g−1dw) and dairy slurry (0.74 log10CFU ml−1) was 2.9-3.7 times smaller than that of cattle dung (2.12 log10CFU g−1dw). The C20 values of biosolids and dairy slurry associated with legal and excess application rates ranged from 1.14 to 1.71 log10CFU ha−1, which is a significant reduction from the initial concentration range (12.99 to 14.83 log10CFU ha−1). The E. coli survival in un-amended soil was linear with a very low decay rate resulting in a higher C20 value than that of biosolids or dairy slurry. The risk assessment and uncertainly analysis showed that the residual concentrations in biosolids/dairy slurry applied soil after 20 days would be 45−57% lower than that of the background soil E. coli concentration. This means the current practice of grazing exclusion times is safe to reduce the risk of E. coli transmission into the soil environment.en_UK
dc.identifier.citationAshekuzzaman SM, Richards K, Ellis S, Tyrrel S, O'Leary E, Griffiths B, Ritz K, Fenton O, Risk assessment of E. coli survival up to the grazing exclusion period after dairy slurry, cattle dung and biosolids application to grassland, Frontiers in Sustainable Food Systems, Vol. 2, 10 July 2018, Article number 34en_UK
dc.identifier.issn2571-581X
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13331
dc.identifier.urihttp://dx.doi.org/10.3389/fsufs.2018.00034
dc.language.isoenen_UK
dc.publisherFrontiersen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectBiosolidsen_UK
dc.subjectDairy slurryen_UK
dc.subjectE. colien_UK
dc.subjectDecayen_UK
dc.subjectRisk assessmenten_UK
dc.subjectAgricultureen_UK
dc.subjectSoilen_UK
dc.titleRisk assessment of E. coli survival up to the grazing exclusion period after dairy slurry, cattle dung, and biosolids application to grasslanden_UK
dc.typeArticleen_UK

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