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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Pp. 067-073 in the Ninth International Animal, Agricultural and Food Processing Wastes Proceedings of the 12-15 October 2003 Symposium (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003.  701P1203.(doi:10.13031/2013.15235)
Authors:   E. Frantz, K. Griswold, G. Apgar, B. Jacobson, and J. Haddock
Keywords:   pathogen loads, antibiotic resistance, vegetative filter strip, dairy, wastewater

A vegetative filter strip (VFS) was assessed for controlling pathogen loads and antibiotic resistance (AR) in dairy wastewater. The VFS was divided into two equal sections, and wastewater was applied to alternating sections in a crossover design every 6 months. Dairy wastewater and surface water surrounding the VFS and a negative control (NC) site were collected every two weeks and after rain events (>1 in. per 24 h) during the study. Fecal coliform (FC) and fecal streptococci (FS) were measured as pathogen load indicators, and AR of the FS was tested with the antibiotics: tetracycline, oxytetracycline, neomycin, streptomycin, erythromycin, ciprofloxacin, and vancomycin. Pathogen loads (CFU log10 per 100 mL) and AR data were analyzed using SAS MIXED procedures, and the model included site, season, rain event, effluent application, and the interaction of site by season. Data on AR of FS from animals was analyzed using the SAS MIXED procedures with the model including species. Site and season affected FC and FS loads (P < 0.05). Fecal coliform loads decreased from wastewater (106) to surface waters (101-105). Fecal streptococci loads decreased from wastewater (108) to surface waters (102-106). Antibiotic resistance was affected by sampling site and season (P < 0.05). Streptomycin and neomycin exhibited the greatest levels of AR while vancomycin exhibited the least. Movement of AR to streptomycin, tetracycline and oxytetracycline may have been affected by animals that habitat the VFS and not the dairy cattle. VFS systems can effectively reduce pathogen loads in dairy wastewater.

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