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EFFECTS OF MANURE STORAGE TIME AND FILLING SCHEME ON ODOR AND HEADSPACE ANALYSIS USING SIMULATED MANURE STORAGE PITS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  024081,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.9335) @2002
Authors:   Wendy Powers, Sarah B. Bastyr
Keywords:   

Swine manure was stored in 2-L simulated manure storage vessels for up to 91 d. Manure was added to the vessels using one of two filling schemes. Vessels were filled either completely on d 0 (single fill; SF) or received a 1/10th-volume addition each week (200 ml) for 10 wk (weekly fill; WF). Weekly, headspace gases were collected for analysis by an electronic nose and gas chromatography. Once weekly, headspace gases were adsorbed to cotton swatches for odor evaluation by human panelists. Vessel contents were collected when vessels were terminated (between 56 and 91 d) and were analyzed for composition. Findings indicate that filling mode and length of manure storage influenced manure components. Solids content was greater in WF vessels. While total nitrogen did not change with storage time, NH4-N increased with time, likely due to conversion of organic nitrogen to inorganic nitrogen. Headspace gas content was influenced by both storage time and filling scheme, although not all analytes were affected similarly. Length of storage time affected odor score. A prediction equation developed from headspace analytes reflected odor scores moderately (R2 = 0.18). as did an equation based on the chemical composition of the manure following storage (R2 = 0.20). Correlation of the electronic nose response to odor score was similar (r = 0.20). However, a prediction equation developed from headspace gas constituents predicted electronic nose response well (R2 = 0.76). Results suggest that manure management practices may be modified to address odor potential. Instrumental methods continue to require further development before they become practical tools for odor assessment.

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