Chen Publications

49 Publications

Climate Friendly Farming Final Report: Improving the Carbon Footprint of Agriculture in the Pacific Northwest

The WSU Center for Sustaining Agriculture & Natural Resources established the Climate Friendly Farming Project in 2003 with an initial grant from the Paul G. Allen Family Foundation. This report represents the culmination of research and assessment of the potential for improved management and technology deployment to reduce agricultural greenhouse gas emissions in the Pacific Northwest.

Purification Technologies for Biogas Generated By Anaerobic Digestion

Chapter 9 in Climate Friendly Farming: Improving the Carbon Footprint of Agriculture in the Pacific Northwest. Full report available at

Integrated Ammonia Recovery Technology in Conjunction with Dairy Anaerobic Digestion

Chapter 8 in Climate Friendly Farming: Improving the Carbon Footprint of Agriculture in the Pacific Northwest. Full report available at

Potential for a Sugar Beet Ethanol Industry in Washington State

A Report to the Washington State Department of Agriculture. School of Economic Sciences. WSU. March 2009

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.

Study of a two-stage growth of DHA-producing marine algae Schizochytrium limacinum SR21 with shifting dissolved oxygen level.

Chi, Z., Liu, Y., Frear, C., Chen, S., (2009) Applied Microbiology and Biotechnology 81(6), 1141-1148.

A Procedure to Estimate Proximate Analysis of Mixed Organic Wastes

Journal of Water Environment Research 81:4.

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.

Organic Waste to Resources Research and Pilot Project Report: New Biorefinery Concept to Convert Softwood Bark to Transportation Fuels Final Report to the Washington State Department of Ecology

Manuel Garcia-Perez, Shulin Chen, Shuai Zhou,Zhouhong Wang, Jieni Lian, Robert Lee Johnson, Shi-Shen Liaw and Oisik Das, September 2009. This project tested a new pretreatment concept to enhance the production of sugars from the fast pyrolysis of wood and straw. It proved that sugars recovered from pyrolysis can be easily converted into ethanol. These two results are important because they show that fast pyrolysis of wood or straw followed by bio-oil hydro-treatment can create green gasoline and diesel (from lignin), as well as ethanol (from cellulose).

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.

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.

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

WSU Invention Disclosure.

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.

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.

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

Article in Sustaining the Pacific Northwest Newsletter

Biomass Inventory and Bioenergy Assessment: An Evaluation of Organic Material Resources for Bioenergy Production in Washington State.

Frear C., Zhao B., Fu G., Richardson M., Chen S., Fuchs M.R. 2005. A collaborative project between the Washington Dept of Ecology,and Washington State University’s Department of Biological Systems Engineering.

Biomass Inventory and Bioenergy Assessment

Craig Frear, Bingcheng Zhao, Guobin Fu, Michael Richardson, Shulin Chen, and Mark Fuchs, December 2005. A biomass inventory and bioenergy assessment of forty five organic resource types across Washington was completed, producing this report and a database with GIS maps ( Annual production of over 16.4 million tons of underutilized bone dry biomass was found, capable of producing (either by combustion or anaerobic digestion) over 15.5 billion kWh of electrical energy.

Studies into using manure in a biorefinery concept

Chen S, Wen Z, Liao W, Liu C, Kincaid RL, Harrison JH, Elliott DC, Brown MD, Stevens DJ (2005). Applied Biochemistry and Biotechnology 121:999-1015.

Value-Added Chemicals from Animal Manure

Chen, S., J.H. Harrison, W. Liao, D. C. Elliott, C. Liu, M. D. Brown, Z. Wen, A. E. Solana, R. L. Kincaid, D. J. Stevens. Dec. 2003. Final Technical Report PNNL-14495.

Bioenergy inventory and assessment for Eastern Washington.

Shulin Chen, Craig Frear, BingCheng Zhao, and Guobin Fu. October 2003. This Phase 1 project assessed Eastern Washington′s twenty counties for available biomass and calculated the potential energy production from twenty four organic resource types. Annual production of 4.3 million tons of underutilized dry biomass was found.

Newer Chen Publications »