title: An investigation into the removal of Salmonella and enteric indicator bacteria from the separated liquid fraction of raw or anaerobically digested pig manure using novel on-farm woodchip biofilters.
abstract: The objective was to investigate the removal of Salmonella and enteric indicator bacteria from the liquid fraction of raw and anaerobically digested (AD) pig manure in woodchip biofilters over a 14 week (98 day) period. Antibiotic susceptible Salmonella Infantis was detected in one influent material (liquid fraction of raw manure) on two occasions but was not found in the effluent at any time point. Furthermore, mean coliform reductions of 56% were observed in the biofilters treating the liquid fraction of raw manure. However, a mean increase of 228% was found in those treating the liquid from AD manure, despite the fact that the microbial challenge to these biofilters was lower. In addition, relatively high coliform counts were still present in the effluent from both biofilter treatments, especially in the systems treating the liquid fraction of AD manure. However, findings for Escherichia coli and Enterococcus were more promising, with reductions observed for both treatments (10 and 18.5% for E. coli and 71 and 87% for Enterococcus). Moreover, E. coli and Enterococcus were at, or just above, the limit of detection in the final effluents. Overall, although, there are no microbial limits for discharge or washwaters, the woodchip filter effluent would appear safe for discharge to waterways or use on-farm as regards Salmonella, E. coli and Enterococcus but not coliform. In conclusion, woodchip biofilters offer potential as a low-cost sustainable novel treatment option for the removal of pathogens from the liquid fraction of pig manure.
authors: Department of Science, Waterford Institute of Technology, Waterford, Ireland; Teagasc Pig Development Department, Animal & Grassland Research & Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland.
authors: G
authors: G
authors: McCarthy
authors: Teagasc Pig Development Department, Animal & Grassland Research & Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland.
authors: P G
authors: PG
authors: Lawlor
authors: Teagasc Pig Development Department, Animal & Grassland Research & Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland; Department of Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland.
authors: K N
authors: KN
authors: Carney
authors: Department of Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland.
authors: X
authors: X
authors: Zhan
authors: Central Veterinary Research Laboratory, Department of Agriculture, Food & the Marine, Backweston Campus, Celbridge, Co. Kildare, Ireland.
authors: M
authors: M
authors: Gutierrez
authors: Department of Science, Waterford Institute of Technology, Waterford, Ireland. Electronic address: ggardiner@wit.ie.
authors: G E
authors: GE
authors: Gardiner
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D004755:Enterobacteriaceae; D005374:Filtration / Q000379:methods*; D008372:Manure / Q000382:microbiology*; D012475:Salmonella / Q000302:isolation & purification*; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D008372:Manure
keywords: Coliform; E. coli; Enterococcus; Pathogen; Slurry; Swine