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Assessment of an aerosol treatment to improve air quality in a swine concentrated animal feeding operation (CAFO).
Rule AM; Chapin AR; McCarthy SA; Gibson KE; Schwab KJ; Buckley TJ
Environ Sci Technol 2005 Dec; 39(24):9649-9655
Poor air quality within swine concentrated animal feeding operations (CAFOs) poses a threat to workers, the surrounding community, and farm production. Accordingly, the current study was conducted to evaluate a technology for reducing air pollution including particulate matter (PM), viable bacteria, and ammonia within such a facility. The technology consists of an acid-oil-alcohol aerosol applied daily. Its effectiveness was evaluated by comparing air quality from before to after treatment and between treated and untreated sides of a barn separated by an impervious partition. On the untreated side, air quality was typical for a swine CAFO, with mean PM2.5 of 0.28 mg/m3 and PM(TOT) of 1.5 mg/m3. The treatment yielded a reduction in PM concentration of 75-90% from before to after treatment. Effectiveness increased with time, application, and particle size (40% reduction for 1 microm and 90% for >10 microm). Airborne bacteria levels (total bacteria, Enterobacteriaceae, and gram-positive cocci) decreased one logarithmic unit after treatment. In contrast, treatment had no effect on ammonia concentrations. These findings demonstrate the effectiveness of an intervention in yielding exposure and emission reductions.
Air quality; Air quality measurement; Air sampling; Air sampling equipment; Air sampling techniques; Air treatment; Air treatment equipment; Aerosols; Animals; Bacteria; Particulates
Timothy J. Buckley, Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe St. (Room E6614), Baltimore,MD21205
Issue of Publication
Environmental Science and Technology
Johns Hopkins University
Page last reviewed: June 15, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division