The spent wheat straw from horse stall bedding has lower cellulose and hemicellulose contents, but higher volatile fatty acid content than raw wheat straw. Biogas production from solid-state anaerobic digestion (SS-AD) of spent wheat straw and raw wheat straw was compared in this study. The SS-AD tests were conducted at 22% total solids (TS) content using inoculum from a liquid AD system at three feedstock-to-inoculum (F/. I) ratios of 2.0, 4.0, and 6.0. Daily methane yields of spent wheat straw peaked 8 and 3. days earlier than those of raw wheat straw at F/. I ratios of 2.0 and 4.0, respectively. The highest methane yield of 150.0. L/kg volatile solids (VS) was obtained from spent wheat straw at an F/. I ratio of 4.0, which was 56.2% higher than that of raw wheat straw. The corresponding cellulose and hemicellulose degradation of spent wheat straw was 24.1% and 49.4% higher than those of raw wheat straw, respectively.
|Number of pages||6|
|State||Published - Oct 2011|
Bibliographical noteFunding Information:
This project is supported by funding from Belcan Corporation . The authors would like to thank Mrs. Mary Wicks (Department of Food, Agricultural and Biological Engineering, OSU) for reading through the manuscript and providing useful suggestions.
- Solid-state anaerobic digestion
- Spent wheat straw
- Wheat straw
ASJC Scopus subject areas
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal