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Impacts of BiOWiSH application on greenhouse gases and air quality from liquid dairy manure.

C. B. Peterson




Impacts of BiOWiSH application on greenhouse gases and air quality from liquid dairy manure.
C. B. Peterson*, Y. Zhao, Y. Pan, F. M. Mitloehner. University of California, Davis Davis, CA.

With increasing focus on the environmental impacts of greenhouse gases (GHG) from livestock, decreasing the impacts of dairy production is of utmost importance. Dairy cattle waste can be a source of GHG emissions and criteria pollutants as well as a possible groundwater contaminant. Several manure additives have been studied as an approach to mitigate environmental impacts of liquid dairy manure (lagoon water). However, these additives have shown mixed efficacy. The present research aimed to test the commercial additive “BiOWiSH” on alterations of carbon dioxide, methane (CH4), and nitrous oxide as well as ammonia. Lagoon water was collected from a commercial dairy in Solano County, CA and contained 0.34% solids, 99.7% moisture, and 0.026% total nitrogen with a pH of 7.68. Lagoon water was randomly allocated into treatment barrels (190 L each) with 6 replicates per treatment for the 3 treatments (n = 6; control, BiOWiSH Manure, and BiOWiSH Odor). Treatments were rehydrated according to product specifications (stock solution: 1 kg of treatment per 1,000 mL of DiH2O) and aliquots of 14 mL stock solution were applied every 9 d for 27 d (shock dose) followed by aliquots of 7 mL of stock solution applied every 9 d over an additional 27 d (maintenance dose), to the respective treatment barrels. Gaseous emissions were collected using flux chambers covering each barrel at designated intervals and measured in real time over a 54-d period. Chambers were connected to a mobile air quality emissions laboratory equipped with gaseous analyzers. The effects of treatments were compared against control. Results showed that BiOWiSH Manure versus the control increased emissions of CH4 by 35.9%. BiOWiSH odor versus control also increased emissions of CH4 by 85.1%. This additive may be applied as an alternate manure management strategy to increase CH4 from covered dairy waste systems where CH4 may then be trapped for subsequent use as a biogas. Further studies are needed to investigate the large scale repeatability of using this product as well as the mechanism of the BiOWiSH lagoon additives.

Keywords: sustainability, dairy cattle, lagoon additive.

Biography: Carlyn Peterson is a fifth year PhD Candidate in the Animal Biology Graduate Group at the University of California, Davis. Carlyn's research interests are nutrition and environmental management, with the goal of improving the overall sustainability of cattle. She has taught various Animal Science courses on the UC Davis campus for the last seven years including animal nutrition and dairy cattle production, among others. She currently serves as the Lead TA for the Career Discovery Group program as well as a Teaching Assistant Consultant Fellow and a mentoring consultant.