|HAYES, MORGAN - University Of Illinois|
|KOZIEL, JACEK - Iowa State University|
Submitted to: Applied Engineering in Agriculture
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/9/2016
Publication Date: 9/28/2016
Citation: Parker, D.B., Hayes, M., Brown-Brandl, T.M., Woodbury, B.L., Spiehs, M.J., Koziel, J.A. 2016. Surface application of soybean peroxidase and calcium peroxide for reducing odorous VOC emissions from swine manure slurry. Applied Engineering in Agriculture. 32(4):389-398.
Interpretive Summary: Compounds emitted from swine manure can pose a odor nuisance to general neighbors and the public. A laboratory experiment was conducted by scientists from ARS (Bushland, Texas and Clay Center, Nebraska), University of Illinois, and Iowa State University to compare the odor reduction efficiencies for the enqyme soybean peroxidide (SBP) applied to the surface of the manure as compared to being fully mixed within the manure. The fully mixed SBP was applied to swine manure at levels ranging from 0 to 0.4 pounds per gallon. The surface-applied SBP was applied to swine manure at levels ranging from 0 to 1.0 pounds per square foot. With surface application, the same odor reduction could be achieved with only 10 percent of the SBP required for fully-mixed. These results are of interest to swine producers and consultants as a means of reducing odor impacts on neighbors.
Technical Abstract: A laboratory experiment was conducted to evaluate and compare topical and fully mixed treatments of soybean peroxidase and calcium peroxide (SBP/CaO2) for reducing odorous volatile organic compound (VOC) emissions from swine manure slurry. The five treatments consisted of a control, the fully mixed rate, and three topical treatments of 10%, 50%, and 100% of the fully mixed application rate. Industrial grade SBP (5 to 50 g/L) and powdered CaO2 (0.16 to 1.6 g/L) were applied to swine manure slurry in 7.6 L containers, and odorous VOC emission rates (phenolics, indolics, volatile fatty acids, methyl sulfides) were measured over a 14 d period using sorbent tubes and gas chromatography. The odorants 4 methylphenol and skatole accounted for the majority of the odor activity value (OAV). The 10% topical application was as effective as the 100% topical and fully mixed application rates at reducing 4 methylphenol and skatole emissions for up to 10 d (P less than 0.05). Emission rates for the treatments were greater than the control on day 14, indicating the need for reapplication of SBP/CaO2 every 7 to 10 d. Future pilot and field scale research should focus on topical application of SBP/CaO2 at a rate equal to 10% of the fully mixed rate.