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Article

Mitigation of Particulate Matter and Airborne Pathogens in Swine Barn Emissions with Filtration and UV-A Photocatalysis

1
Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, IA 50011, USA
2
Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA 50011, USA
3
Department of Chemistry, Iowa State University, Ames, IA 50011, USA
4
Department of Statistics, Iowa State University, Ames, IA 50011, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Wonyong Choi, Detlef W. Bahnemann, Ioannis Konstantinou, Ewa Kowalska, Magdalena Janus, Vincenzo Vaiano and Zhi Jiang
Catalysts 2021, 11(11), 1302; https://doi.org/10.3390/catal11111302
Received: 8 October 2021 / Revised: 26 October 2021 / Accepted: 26 October 2021 / Published: 28 October 2021
(This article belongs to the Special Issue 10th Anniversary of Catalysts—Feature Papers in Photocatalysis)
This study evaluated the use of filtration and UV-A photocatalysis for the reduction of particulate matter (PM) and airborne bacterial pathogens in swine barns. Two MERV filters (8 and 15) were used to mitigate PM concentrations measured at the PM 1, PM 2.5, respirable PM, and PM 10 ranges. Filtration was also used to generate different levels of airborne pathogens to be treated by UV-A. Results show that MERV 8 and 15 filters effectively reduced PM concentrations (96–98%) in air exhausted from a swine barn (p ranged from <0.01 to 0.04). UV-A photocatalysis did not mitigate PM concentrations. UV-A photocatalysis treatment reduced measured colony-forming units (CFUs) by 15–95%. The CFU percent reduction was higher when airborne PM concentration was low. The numeric results suggested a real mitigation effect despite p-values that did not meet the usual statistical cut-off of <0.05 for significance due to the large variability of the CFU control samples. Normalization of measured airborne pathogen concentrations by smaller PM size range concentrations led to emerging significant treatment differences for CFUs. A significant decrease (~51% reduction; p < 0.02) in the concentration of viable airborne bacteria was shown for all PM below the 10 micron range. View Full-Text
Keywords: air pollution control; biosecurity; animal diseases; ultraviolet light; advanced oxidation; filtration; environmental technology air pollution control; biosecurity; animal diseases; ultraviolet light; advanced oxidation; filtration; environmental technology
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MDPI and ACS Style

Lee, M.; Koziel, J.A.; Macedo, N.R.; Li, P.; Chen, B.; Jenks, W.S.; Zimmerman, J.; Paris, R.V. Mitigation of Particulate Matter and Airborne Pathogens in Swine Barn Emissions with Filtration and UV-A Photocatalysis. Catalysts 2021, 11, 1302. https://doi.org/10.3390/catal11111302

AMA Style

Lee M, Koziel JA, Macedo NR, Li P, Chen B, Jenks WS, Zimmerman J, Paris RV. Mitigation of Particulate Matter and Airborne Pathogens in Swine Barn Emissions with Filtration and UV-A Photocatalysis. Catalysts. 2021; 11(11):1302. https://doi.org/10.3390/catal11111302

Chicago/Turabian Style

Lee, Myeongseong, Jacek A. Koziel, Nubia R. Macedo, Peiyang Li, Baitong Chen, William S. Jenks, Jeffrey Zimmerman, and R. V. Paris. 2021. "Mitigation of Particulate Matter and Airborne Pathogens in Swine Barn Emissions with Filtration and UV-A Photocatalysis" Catalysts 11, no. 11: 1302. https://doi.org/10.3390/catal11111302

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