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dc.contributor.authorAshekuzzaman SMen
dc.contributor.authorRichards Ken
dc.contributor.authorEllis Sen
dc.contributor.authorTyrrel Sen
dc.contributor.authorO'Leary Een
dc.contributor.authorGriffiths BSen
dc.contributor.authorRitz Ken
dc.contributor.authorFenton Oen
dc.date.accessioned2018-07-10T10:44:58Z
dc.date.available2018-07-10T10:44:58Z
dc.date.issued2018
dc.identifier.citation2:34en
dc.identifier.urihttps://doi.org/10.3389/fsufs.2018.00034
dc.identifier.urihttp://hdl.handle.net/11262/11477
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
dc.description.sponsorshipScottish Government RESAS Strategic Research Programme (RD2.3.4)en
dc.language.isoenen
dc.relation.isformatof14884en
dc.relation.ispartofFrontiers in Sustainable Food Systemsen
dc.rightsCopyright © 2018 Ashekuzzaman, Richards, Ellis, Tyrrel, O’Leary, Griffiths, Ritz and Fenton. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
dc.subjectBiosolidsen
dc.subjectDairy slurryen
dc.subjectE. colien
dc.subjectDecay rateen
dc.subjectRisk Assessmenten
dc.subjectAgricultureen
dc.subjectSoilen
dc.titleRisk assessment of E.coli survival up to the grazing exclusion period after dairy slurry, cattle dung and biosolids application to grasslanden
dc.typeArticleen
dc.description.versionVersion of Record
rioxxterms.publicationdate2018-07-10
rioxxterms.typeJournal Article/Reviewen
dcterms.dateAccepted2018-06-18
refterms.accessExceptionNAen
refterms.dateDeposit2018-07-10
refterms.depositExceptionNAen
refterms.panelUnspecifieden
refterms.technicalExceptionNAen
refterms.versionVoRen


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