Anaerobic Digestion (Biogas) Publications

83 Publications

Development of New Digester Technologies for Improved Adoption and Cost Reduction

Chapter 11 in Climate Friendly Farming: Improving the Carbon Footprint of Agriculture in the Pacific Northwest. Full report available at

Green from the Ground Up – The Innovators Lecture

Featured lectures by CSANR Director Chad Kruger and researcher Lynne Carpenter-Boggs. PowerPoint presentation and video of event are available.

The Economics of Dairy Anaerobic Digestion with Co-Product Marketing

Bishop, C.P. and C.R. Shumway. Review of Agricultural Economics 31, 3(Fall 2009):394-410.

Organic Waste to Resources Research and Pilot Project Report: Producing Energy and Fertilizer from Organic Municipal Solid Waste: Enhancing Hydrolysis and Bacterial Populations and Mixing and Thermodynamic Modeling of New Solid Waste Treatment Technology

Usama Zaher, Shulin Chen, Chenlin Li, Liang Yu, and Timothy Ewing, June 2009. This project developed, tested and modeled a high solids anaerobic digester consisting of a solids reactor and a leached liquids UASB for reacting volatile fatty acids. At near neutral pH the system improves methane production 50% over existing digesters, while return flow reseeds the solids digester with high titer micro-organisms that improved biological kinetics. The dual reactors system provides for control of digester limiting acid and ammonia processes, while allowing for nutrient recovery, and significantly improves performance for capital outlay.

Advanced Biogas Plant Design

Detailed CAD drawings for improved version of pilot biogas plant developed at WSU.

A Procedure to Estimate Proximate Analysis of Mixed Organic Wastes

Journal of Water Environment Research 81:4.

Organic Waste to Resources Research and Pilot Project Report: Waste to Fuels Technology: Evaluating Three Technology Options and the Economics for Converting Biomass to Fuels

Hayk Khachatryan, Ken Casavant, and Eric Jessup, Jie Chen, Shulin Chen, and Craig Frear, September 2009. This study further investigated biomass from the 2005 biomass inventory by comparing three fuel technologies: cellulosic biomass conversion by fermentation for ethanol, or gasification for mixed-alcohols, and anaerobic digestion of high volatile solids biomass for methane production. The study then integrated the major cost factors: biomass availability, feedstock prices, transportation costs, processing costs, and geographic distribution into a comprehensive model framework using GIS and MATLAB-SIMULINK models, to assess final delivered fuel cost.

Organic Waste to Resources and Pilot Project Report: Biodiesel and Biohydrogen Co-Production with Treatment of High Solid Food Waste

Yubin Zheng, Jingwei Ma, Zhanyou Chi, and Shulin Chen, September 2009. two-step process was developed as a potential technology to produce hydrogen and biodiesel from food waste. The first process use fermentative bacteria to breakdown glucose from food waste to produce hydrogen and volatile fatty acids (VFA). The VFA are then fed to yeast for simultaneous carbon sequestration resulting in production of biodiesel from the oil-producing microbial biomass.

GISCOD: General Integrated Solid Waste Co-digestion Model

Zaher, U., R. Li, U. Jeppsson, J.P. Steyer, S. Chen (2009). Water Research 43(10), 2717-2727.

Utilization of Re-Processed Anaerobically Digested Fiber from Dairy Manure as a Container Media Substrate

MacConnell, C.B. and Collins, H.P. 2009. Acta Horticulturae (ISHS) 819:279-286

Advanced small-scale anaerobic digester design tailored for household user living in cold climate

WSU Invention Disclosure.

Proceedings of the Department of Ecology’s Beyond Waste Workshop (2009)

A special workshop planned by CSANR and hosted by the Department of Ecology Waste 2 Resources Division to feature state-funded research projects relating to the topics of recovering energy and resources (including soil amendments) from organic wastes.

Recommendations for the Development of Agricultural Sector Carbon Offsets in Washington State

Washington State Agricultural Sector Carbon Market Workgroup (ASCMW).

Proceedings of EPA Ag STAR Northwest Dairy Digester Workshop

Includes agenda and presentation slides from Nov 18, 2008 workshop in Sunnyside, WA.

Innovations in Anaerobic Digestion at WSU – Fall 2008

Article in Sustaining the Pacific Northwest Newsletter

Anaerobic digestion of dairy manure with enhanced ammonia removal

Uludag-Demirer, S., Demirer, G.N., Frear, C., Chen,S., (2008). Journal of Environmental Management 86:193-200

Evaluation of a new fixed bed digester design utilizing large size media for flushed dairy manure treatment

Zaher U., Frear C., Pandey, P. and Chen S. (2008). Bioresource Technology 99(18), 8619-8625.

High Quality Fiber and Fertilizer as Co-Products from Anaerobic Digestion

Kruger, C.E., Chen, S., MacConnell, C.B., Harrison, J.H., Shumway, C.R., Zhang, T., Oakley, K., Bishop, C., Frear, C., Davidson, D., and Bowers, K. (2008). Journal of Soil and Water Conservation. 63(1), 12A-13A.

Renewable Fertilizer from Nutrient Extraction of Anaerobically Digested Dairy Manure

Poster presentation – BIOAg Research Symposium 2008.

Manure to Money: Advancements in Anaerobic Digestion

Feb 2007. Extension Engaged video broadcast. There are about 250,000 dairy cows in Washington State, and all of them poop. The methane they produce is a powerful greenhouse gas, but also can be captured through anaerobic digestion and used to generate electricity. Learn how WSU is leading the way to making digestion economically feasible by extracting other value-added products from the waste that can provide a financial return to farmers while improving the environment. We’ll look at the state’s only commercial digester in Whatcom County, and at new small digester technology being tested in Pullman. Video provided through RealPlayer; also available through Windows Media Player here.

Biomass Inventory Technology and Economics Assessment

Liao W., C. Frear and S. Chen, June 2007. This project compiled a literature search for biomass chemical characterization and conducted supplemental laboratory study of forty two feedstocks for 33 parameters such as dry matter, COD, carbohydrates, lipids, elemental and mineral matter, and standard properties such as protein, fiber, pH, etc. A follow-on report will group similar feedstocks, assess potential energy conversion technologies and conduct an economic analysis of feedstock collection and energy production.

Producing Energy and Fertilizer from Organic Municipal Solid Waste – Project Deliverable #1

Usama Zaher, Dae-Yeol Cheong, Binxin Wu, and Shulin Chen, June 2007. A literature review of current digester technologies formed the framework for designing a bench scale study of a high solids anaerobic digestion (HSAD) system. The study shows that significant improvements in methane production can be attained while decreasing capital costs for facilities. A new digester design is proposed that will optimize methane from organic food and green waste digestion, while recovering nutrients from the digestate.

Dairy Waste in the Horticultural Industry – December 2006

Article in Sustaining the Pacific Northwest Newsletter

Household Biogas Digester: An Underutilized Potential

A presentation on applications of small-scale biogas plants in India.

Small-scale biogas: Can it work in the Pacific Northwest? – December 2005

Article in Sustaining the Pacific Northwest Newsletter

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