Pilot-scale testing of renewable biocatalyst for swine manure treatment and mitigation of odorous VOCs, ammonia and hydrogen sulfide emissions

• Published in: Atmospheric environment (1994) Vol. 150; pp. 313 - 321
• Main Authors: Maurer, Devin L., Koziel, Jacek A., Bruning, Kelsey, Parker, David B.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-02-2017
• Subjects: Biocatalyst; Mitigation; Odor; Soybean peroxidase; Swine manure; Mitigation; Soybean peroxidase; Swine manure; Odor; Biocatalyst
• ISSN: 1352-2310; 1873-2844
• DOI: 10.1016/j.atmosenv.2016.11.021

Comprehensive control of odors, hydrogen sulfide (H2S), ammonia (NH3), and greenhouse gas (GHG) emissions associated with swine production is a critical need. A pilot-scale experiment was conducted to evaluate surface-applied soybean peroxidase (SBP) and calcium peroxide (CaO2) as a manure additive to mitigate emissions of odorous volatile organic compounds (VOC) including dimethyl disulfide/methanethiol (DMDS/MT), dimethyl trisulfide, n-butyric acid, valeric acid, isovaleric acid, p-cresol, indole, and skatole. The secondary impact on emissions of NH3, H2S, and GHG was also measured. The SBP was tested at four treatments (2.28–45.7 kg/m2 manure) with CaO2 (4.2% by weight of SBP) over 137 days. Significant reductions in VOC emissions were observed: DMDS/MT (36.2%–84.7%), p-cresol (53.1%–89.5%), and skatole (63.2%–92.5%). There was a corresponding significant reduction in NH3 (14.6%–67.6%), and significant increases in the greenhouse gases CH4 (32.7%–232%) and CO2 (20.8%–124%). The remaining emissions (including N2O) were not statistically different. At a cost relative to 0.8% of a marketed hog it appears that SBP/CaO2 treatment could be a promising option at the lowest (2.28 kg/m2) treatment rate for reducing odorous gas and NH3 emissions at swine operations, and field-scale testing is warranted.
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•Soybean peroxidase (SBP) is a bio-based, soybean-derived, low cost product.•Topical treatment using SBP/CaO2 to mitigate gas emissions from manure was tested.•Emissions reduced up to 68% (NH3), 85% (DMDS/MT), 90% (p-cresol), & 93% (skatole).•There was a corresponding increase in CO2 & CH4 emissions.•The remaining target gas emissions (including N2O) were not statistically different.