Abstract
Control of gaseous emissions from livestock operations is needed to ensure compliance with environmental regulations and sustainability of the industry. The focus of this research was to mitigate livestock odor emissions with UV light. Effects of the UV dose, wavelength, TiO2 catalyst, air temperature, and relative humidity were tested at lab scale on a synthetic mixture of nine odorous volatile organic compounds (VOCs) and real poultry manure offgas. Results show that it was feasible to control odorous VOCs with both photolysis and photocatalysis (synthetic VOCs mixture) and with photocatalysis (manure offgas). The treatment effectiveness R (defined as % conversion), was proportional to the light intensity for synthetic VOCs mixtures and followed an order of UV185+254 + TiO2 > UV254 + TiO2 > UV185+254; no catalyst > UV254; no catalyst. VOC conversion R > 80% was achieved when light energy was >~60 J L−1. The use of deep UV (UV185+254) improved the R, particularly when photolysis was the primary treatment. Odor removal up to ~80% was also observed for a synthetic VOCs mixture, and actual poultry manure offgas. Scale-up studies are warranted.
Highlights
Public awareness of nuisance odor emissions from livestock facilities is growing
In this paper, we report on a study evaluating the feasibility of direct UV photolysis and UV/TiO2 photocatalysis to treat synthetic air mixtures of key volatile organic compounds (VOCs) associated with livestock odor
Our working hypothesis is that advanced oxidation processes (UV/TiO2 catalytic oxidation) can eventually be applied to treat odorants emitted from confined animal feeding operations (CAFOs)
Summary
Public awareness of nuisance odor emissions from livestock facilities is growing. Confined animal feeding operations (CAFOs) are sources of aerial emissions of odorous volatile organicCatalysts 2020, 10, 607; doi:10.3390/catal10060607 www.mdpi.com/journal/catalystsCatalysts 2020, 10, 607 compounds (VOCs), ammonia (NH3 ), hydrogen sulfide (H2 S), greenhouse gases (GHGs, e.g., CO2 , CH4 , N2 O), and particulate matter (PM) including bioaerosols. Public awareness of nuisance odor emissions from livestock facilities is growing. Confined animal feeding operations (CAFOs) are sources of aerial emissions of odorous volatile organic. The VOCs emitted by CAFOs have been characterized extensively. Was completed in the U.S and resulted in several publications focused on quantitative odor and VOC emissions from swine barns and dairy operations [1,2,3,4]. Multiple studies presented volatiles speciation and characterized key odorants in emissions from poultry and swine [5,6] and for VOC emissions from beef and dairy cattle [7,8,9,10]. Livestock odor is a global issue and is of interest to the international community of researchers
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