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Anaerobic digestion of equine waste
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Anaerobic digestion of equine waste
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ETD_2140
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051919
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eng
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theses
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Topic
Environmental Sciences
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(authority = ETD-LCSH)
Topic
Animal waste
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(authority = ETD-LCSH)
Topic
Horses
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(authority = ETD-LCSH)
Topic
Manures
Abstract
The goals of this project were to determine the methane production potential of horse manure during anaerobic digestion; to examine the effect of softwood chip bedding, pelleted Woody Pet® softwood bedding, and straw on the methane production potential of equine stall waste; and to investigate the feasibility of co-digestion of waste food and equine waste under thermophilic conditions.
Initial results suggested that softwood bedding may have inhibited methane production in 15 L semi-continuous digesters. However, further extensive investigation in batch and continuous flow digesters determined that softwood bedding did not inhibit methane production and, on the contrary, contributed to methane production. The methane production potential for horse manure at 35°C averaged 139 ± 65 L/ kg VS (average ± standard deviation) and 29 ± 15 L/ kg wet weight, corresponding to 9.2 ± 4.8 x 105 kJ / metric ton wet weight. The energy production potential of stall waste with softwood chip bedding ranged from 4.0 ± 0.4 x 105 kJ / metric ton wet weight to 6.6 ± 0.8 x 105 kJ / metric ton wet weight, depending upon the relative amount of bedding present.
Co-digestion of equine waste and food waste under thermophilic conditions was performed at the 20 L and 6.3 m3 scale. The 20 L thermophilic digesters were fed a variety of food wastes in addition to stall waste containing softwood bedding. The methane production from these digesters was 356 ± 61 L/kg VS-d. The large-scale (6.3 m3) digester was operated in excess of one year primarily on waste food and horse manure (no bedding). The loading rate increased over time to 1.7 kg VS/m3-d. The methane content of the biogas was 55.7 ± 5.2 %. Total ammonia nitrogen approached 5 g/L, suggesting a higher C:N ratio feed stock mixture than that afforded by the waste food and horse manure mixture might be necessary for future applications.
Initial results suggested that softwood bedding may have inhibited methane production in 15 L semi-continuous digesters. However, further extensive investigation in batch and continuous flow digesters determined that softwood bedding did not inhibit methane production and, on the contrary, contributed to methane production. The methane production potential for horse manure at 35°C averaged 139 ± 65 L/ kg VS (average ± standard deviation) and 29 ± 15 L/ kg wet weight, corresponding to 9.2 ± 4.8 x 105 kJ / metric ton wet weight. The energy production potential of stall waste with softwood chip bedding ranged from 4.0 ± 0.4 x 105 kJ / metric ton wet weight to 6.6 ± 0.8 x 105 kJ / metric ton wet weight, depending upon the relative amount of bedding present.
Co-digestion of equine waste and food waste under thermophilic conditions was performed at the 20 L and 6.3 m3 scale. The 20 L thermophilic digesters were fed a variety of food wastes in addition to stall waste containing softwood bedding. The methane production from these digesters was 356 ± 61 L/kg VS-d. The large-scale (6.3 m3) digester was operated in excess of one year primarily on waste food and horse manure (no bedding). The loading rate increased over time to 1.7 kg VS/m3-d. The methane content of the biogas was 55.7 ± 5.2 %. Total ammonia nitrogen approached 5 g/L, suggesting a higher C:N ratio feed stock mixture than that afforded by the waste food and horse manure mixture might be necessary for future applications.
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electronic resource
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x, 122 p. : ill.
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M.S.
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Includes bibliographical references (p. 115-122)
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by Brian A. Wartell
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Wartell
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Brian A.
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1984-
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Brian A. Wartell
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Fennell
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Donna
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chair
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Donna E Fennell
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Strom
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Peter
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Peter Strom
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A.J.
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A.J. Both
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John
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John Reinfelder
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Rutgers University
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Graduate School - New Brunswick
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2009
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2009-10
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xx
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Rutgers University Electronic Theses and Dissertations
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Graduate School - New Brunswick Electronic Theses and Dissertations
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doi:10.7282/T38K798D
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ETD graduate
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The author owns the copyright to this work
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Copyright protected
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Open
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Wartell
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Brian
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Brian Wartell
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Rutgers University. Graduate School - New Brunswick
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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