Waste to Fuels Publications
CSANR webpage. Anaerobic digestion (AD) is a process in which organic matter is converted into methane by bacteria in the absence of oxygen. Under typical dairy farm conditions manure is stored in open ponds and applied to fields, where decomposition often occurs under anaerobic conditions. This leads to the natural, open-air production of methane, a greenhouse gas with more than 20 times the warming value of carbon dioxide. By enclosing, controlling and accelerating this natural anaerobic conversion process, not only can the methane be contained, but it can be converted to renewable energy, providing two mechanisms for carbon sequestration and global warming reduction – methane capture/conversion and fossil-fuel energy offset.
Website highlighting a WSU – Bellingham Technical College partnership to offer training for anaerobic digestion technicians. Full curriculum, videos and more available online.
Efficient Use of Algal Biomass Residues for Biopower Production with Nutrient Recycle: Final Project Report
Jarvis, E. R. Davis, C. Frear. Aug 2013.
Anaerobic Digestion Systems: Integrating emerging technologies to improve environmental and economic impact
C. Frear, C.Kruger, H. Collins, M. Garcia-Perez, C. Stockle, R. Shumway, G. Astill, T. Ewing, N. Kennedy, T. Khalil, and G. Yorgey. July 2013. Academic Poster.
Frear, C, M. Garcia-Perez, C. Kruger, S. Chen. 2013.
J. Ma, B. Zhao, C. Frear, Q. Zhao, L. Yu, X. Li, S. Chen. June 2013.Bioresource Technology Volume 137, June 2013, Pages 41–50.
May 2013. CSANR produced a 7.5 minute video showing how state-of-the-art anaerobic digestion systems can offer multiple benefits to society.
April 2013. Zhao, B., J. Ma, Q. Zhao, and C. Frear. WSU subcontract work on Department of Energy Project 22902.
A simple methodology for rate-limiting step determination for anaerobic digestion of complex substrates and effect of microbial community ratio
J. Ma, C. Frear, Z. Wang, L. Yu, Q. Zhao, X. Li, S. Chen. Bioresource Technology. Volume 134, April 2013, Pages 391–395.
J. Ma, L. Yu, C. Frear, Q. Zhao, X. Li, S. Chen. Bioresource Technology. Volume 131, March 2013, Pages 6–12.
L. Yu, Q. Zhao, J. Ma, C. Frear, S. Chen. Bioresource Technology. Volume 124, November 2012, Pages 8–17.
Methods for Producing Biochar and Advanced Biofuels in Washington State Part 3: Literature Review Technologies for Product Collection and Refining
Garcia-Perez, M. et. al. 2012. This is the third of a series of reports exploring the use of biomass pyrolysis to sequester carbon and to produce fuels and chemicals.
Methods for Producing Biochar and Advanced Biofuels in Washington State Part 2: Literature Review of the Biomass Supply Chain and Preprocessing Technologies From Field to Pyrolysis Reactor
Garcia-Perez, M., C. Kruger, M. Fuchs, S. Sokhansanj, P. Badger, J. Garcia-Nunez, T. Lewis, and S. Kantor. 2012. Second Project Report. Department of Biological Systems Engineering and the Center for Sustaining Agriculture and Natural Resources, Washington State University, Pullman, WA, 79 pp.
May 2012. Coppedge, B., G. Coppedge, D. Evans, J. Jensen, K. Scanlan, B. Scanlan, P. Weisberg and C. Frear. An anaerobic digester case study for alternative outtake markets and remediation of nutrient loading concerns within the region. A report to Washington State Department of Commerce.
WSU and Bellingham Technical College produced this video as a part of their grant-funded Anaerobic Digestion Technician certificate program. The video explains the technical aspects of operating and maintaining an anaerobic digester.
Two novel floor-scale anaerobic digester systems for processing food waste. Part 1: Multi-reactor, liquid recycle system for high solids. Part 2: Moderate solids system.
Frear, C., Ewing, T., Yu, L., Ma, J., and Chen, S. 2012. Olympia, WA. Washington State Department of Ecology.
Video of keynote address by Chad Kruger at the 26th Annual BioCycle West Coast Conference April 2012.
This webinar highlights recent research by Rita Hummel of WSU on struvite as a phosphorus source for greenhouse production of bedding plants and vegetable starts. Her research includes struvite derived from municipal wastewater and dairy manure. Craig Cogger opened the webinar with a brief overview of the phosphorus challenge. After Rita’s presentation of greenhouse research results, Keith Bowers discussed struvite production as one phosphorus removal technology for wastewater at livestock, food processing, and public sewage treatment sites. The webinar closed with a brief summary by Craig and an open question period.
Estimating greenhouse gas emissions from soil following liquid manure applications using a unit response curve method
G. Wang, S. Chen, C. Frear. Geoderma. Volume 170, 15 January 2012, Pages 295–304.
Streubel, J. D., H. P. Collins, J. M. Tarara, and R. L. Cochran.; Posted online 5 Jan. 2012
Frear, C., W. Liao, T. Ewing, and S. Chen. Clean – Soil, Air, Water 2011,39 (7), 697–704.
WSU scientists have conducted extensive research on Anaerobic Digestion (AD) as a technology for recovery of methane (energy), stable carbon, and nutrients from organic wastes such as manure, food processing wastes and the organic fraction of municipal solid wastes (OFMSW). Our research has evaluated the technical and economic performance of commercially available systems, developed improved AD reactors, and commercialized WSU patented nutrient recovery technology. This webinar, presented by CSANR director Chad Kruger and CSANR scientist Craig Frear, will provide an update on the latest results from the WSU Climate Friendly Farming Project’s AD research.
WSU Extension Fact Sheet FS040E. Yorgey, G., C. Kruger, K. Steward, C. Frear, & N. Mena. August 2011. This fact sheet is part of the AD Systems Series.
Methods for Producing Biochar and Advanced Biofuels in Washington State Part 1: Literature Review of Pyrolysis Reactors
Garcia-Perez, M., T. Lewis, C. Kruger. 2011. Funding for this study is provided by the Washington State Department of Ecology with the intention to address the growing demand for information on the design of advanced pyrolysis units. This is the first of a series of reports exploring the use of biomass thermochemical conversion technologies to sequester carbon and to produce fuels and chemicals.
Biogas potential and microbial population distributions in flushed dairy manure and implications on anaerobic digestion technology
Frear, C., Wang, Z., Li, C., Chen, S., (2011). Journal of Chemical Technology & Biotechnology, 86:145-152.