Effect of Anaerobic Digestion and Application Method on the Presence and Survivability of <Emphasis Type="Italic">E. coli</Emphasis> and Fecal Coliforms in Dairy Waste Applied to Soil |
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Authors: | Olivia Saunders Joe Harrison Ann Marie Fortuna Elizabeth Whitefield Andy Bary |
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Institution: | (1) Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USA;(2) Department of Animal Sciences, Washington State University, 2606 West Pioneer, Puyallup, WA 98371, USA;(3) Department of Crop and Soil Sciences, Washington State University, Puyallup, WA 98371, USA; |
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Abstract: | Animal wastes are commonly used in a sustainable manner to fertilize crops. However, manures contain numerous pathogenic bacteria
that can impact animal and human health. Treatment of animal waste by anaerobic digestion has the potential to reduce pathogen
loading to land. This study was conducted to determine the fate of bacteria applied in raw and anaerobically digested dairy
slurries that were broadcast and subsurface applied in a field of forage grasses. Digested slurry had significantly fewer
indicator bacteria, Escherichia coli and fecal coliform at time of application. Anaerobic digestion did not increase the survivability of indicator bacteria.
Waste treatment and application method did not affect the rate of bacteria die-off. There were fewer E. coli and fecal coliform at the end of each trial in the soils that received digested slurry. Anaerobic digestion of dairy waste
has the potential to reduce pathogenic bacteria loading to cropland. |
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