Zaher Publications

9 Publications

Life cycle assessment of the potential carbon credit from no- and reduced-tillage winter wheat-based cropping systems in Eastern Washington State

Zaher, U, C. Stockle, K. Painter, S. Higgins. Agricultural Systems. November 2013. Volume 122, pages 73-78.

Life Cycle Assessment of the Potential Carbon Credit from No- and Reduced- Tillage Winter Wheat in the U.S. Northwest

Chapter 25 in Climate Friendly Farming: Improving the Carbon Footprint of Agriculture in the Pacific Northwest. Full report available at http://csanr.wsu.edu/pages/Climate_Friendly_Farming_Final_Report/.

Development of Co-Digestion Software Models to Assist in Plant Design and Co-Digestion Operation

Chapter 5 in Climate Friendly Farming: Improving the Carbon Footprint of Agriculture in the Pacific Northwest. Full report available at http://csanr.wsu.edu/pages/Climate_Friendly_Farming_Final_Report/.

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 http://csanr.wsu.edu/pages/Climate_Friendly_Farming_Final_Report/.

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.

A Procedure to Estimate Proximate Analysis of Mixed Organic Wastes

Journal of Water Environment Research 81:4.

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.

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.

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.