Risk Assessment of E. coli Survival Up to the Grazing Exclusion Period After Dairy Slurry, Cattle Dung, and Biosolids Application to Grassland

Grassland 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 = 1,000 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., C-20, log(10) CFU g(-1) dw) of 1.0 in 100% biosolids or inoculated soil and the lowest C-20 of 0.098 in 75/25 soil/biosolids ratio, respectively, in comparison to an average initial value of 6.4 log(10) CFU g(-1) dw. The E. coli survival across scenario 2, 3, and 4 showed that the C-20 value of biosolids (0.57 log(10) CFU g(-1) dw) and dairy slurry (0.74 log(10) CFU ml(-1)) was 2.9-3.7 times smaller than that of cattle dung (2.12 log(10) CFU g(-1) dw). The C-20 values of biosolids and dairy slurry associated with legal and excess application rates ranged from 1.14 to 1.71 log(10) CFU ha(-1), which is a significant reduction from the initial concentration range (12.99 to 14.83 log(10) CFU ha(-1)). The E. coli survival in un-amended soil was linear with a very low decay rate resulting in a higher C-20 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.