Location: Bioenergy Research Unit
Title: Inhibition of total gas production, methane, hydrogen sulfide, and sulfate-reducing bacteria from in vitro stored swine manure using condensed tannins Authors
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2013
Publication Date: April 5, 2013
Citation: Whitehead, T.R., Spence, C., Cotta, M.A. 2013. Inhibition of total gas production, methane, hydrogen sulfide, and sulfate-reducing bacteria from in vitro stored swine manure using condensed tannins [abstract]. Waste to Worth: "Spreading" Science & Solutions. Technical Abstract: Management practices from large-scale swine production facilities have resulted in the increased collection and storage of manure for off-season fertilization use. Odor produced during storage has increased the tension among rural neighbors and among urban and rural residents, and greenhouse gas emissions may contribute to climate change. Production of these compounds from stored manure is the result of microbial activity of the anaerobic bacterial populations present during storage. We have been studying the bacterial populations of stored manure to develop methods to reduce bacterial metabolic activity and production of gaseous emissions, including the toxic odorant hydrogen sulfide produced by sulfate-reducing bacteria. Quebracho and other condensed tannins were tested for effects on total gas, hydrogen sulfide, and methane production and levels of sulfate-reducing bacteria in in vitro swine manure slurries. Quebracho condensed tannins were found to be most effective of tannins tested, and total gas, hydrogen sulfide, and methane production were all inhibited by greater than 90% from in vitro manure slurries. The inhibition was maintained for at least 28 days. Total bacterial numbers in the manure were reduced significantly following addition of quebracho tannins, as were sulfate-reducing bacteria. These results indicate that the condensed tannins are eliciting a collective effect on the bacterial population, and the addition of quebracho tannins to stored swine manure may reduce odorous and greenhouse gas emissions.