PIUS MWANGI NDEGWA, PhD Biological Systems Engineering Washington State University L.J. Smith 202, P.O. Box 646120 Pullman, WA 99164-6120 Phone: (509)-335-8167; Fax: 509-335-2722 E-mail: ndegwa@wsu.edu EDUCATION Ph.D., Biological & Agricultural Engineering, University of Georgia, Athens, Georgia, 1999 M.S., Agricultural Engineering, University of Georgia, Athens, Georgia, 1990 B.S., Agricultural Engineering, University of Nairobi, Nairobi, Kenya, 1986 PROFESSIONAL EXPERIENCE Assistant Professor (75% Research & 25% Extension): Washington State University, Pullman (2004 present). Assistant Researcher: Oklahoma State University, Stillwater, Oklahoma (2001 2004). Postdoctoral Research Associate: University of Minnesota SROC, Waseca (1999-2001). Research/Teaching Assistant: University of Georgia, Athens, Georgia (1995 1999). Lecturer: University of Nairobi, Nairobi, Kenya (1993 1995). Adjunct Lecturer: Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya (1994 1995). Project Engineer: Ministry of Agriculture, Nairobi, (1990 1993). Research/Teaching Assistant: University of Georgia, Athens, Georgia (1988 1990). Assistant Engineer: Ministry of Agriculture, Nakuru, Kenya (1986 1988). TEACHING/RESEARCH/EXTENSION INTERESTS My interests are in the development of sustainable livestock manure management systems, air and water quality control engineering, bio-energy or bio-fuels, and livestock odor emission control technologies. Specific research themes include: solids-liquid separation for nutrient management; manure characterization; aerobic and anaerobic digestions or treatments (with and without cell-immobilization); Nutrients transport in soils; bioconversion of livestock waste (composting and vermicomposting); natural livestock-wastewater treatment systems; characterization and quantification of odor, gaseous, and particulate emissions from livestock facilities; and modeling of bioenvironmental systems. PROFESSIONAL SERVICE Reviewer for the following Scientific journals:- 1. Journal of Bioresource Technology, UK 2. Journal of Applied Environmental Science and Public Health, Australia 3. Transactions of the American Society of Engineering (ASAE), USA 4. Applied Engineering in Agriculture, USA 5. Biosystems Engineering, UK 6. Canadian Biosystems Engineering, Canada
ROFESSIONAL AFFLIATIONS 1. American Society of Agricultural Engineers (ASAE). 2. Kenyan Society of Agricultural Engineers (KASE). HONORS and AWARDS 1. Upper Second Class Honors: BS degree, University of Nairobi, Kenya 1986. 2. Bestowed membership: The Honor Society of Agriculture: Gamma Sigma Delta, 1989. 3. Biography listing: Who s Who in America, 56 th Edition, 2001. 4. Superior ASAE Paper Award: Top 2.5% of papers published in the Transactions of the ASAE, 2002. 5. Biography listing: Who s Who in Science and Engineering, 7 th Edition, 2002. 6. Biography listing: International Scientist of The Year 2003, IBC, Cambridge, England. 7. Biography listing: Who's Who in Engineering Education, 2005. PROFESSIONAL CERTIFICATIONS Professional Engineer Intern, Minnesota No. 123230. PUBLICATIONS Refereed Journal Articles Ndegwa, P.M., D.W. Hamilton, J.A. Lalman, H.J. Cumba. Optimization of Anaerobic Sequencing Batch Reactors (ASBRs) Treating Dilute Swine Slurries. Trans. of the ASAE (Accepted). Zhu J, Luo A, Zhou Y, Ndegwa PM, Schmidt DR. 2004. The Age Effect of Dairy Feedlots on Manure Nutrient Seepage in Loam Soils. Biosystems Engineering 89 (2): 223-229. Ndegwa, P.M., 2004. Solids Separation Enhances Reduction of Organic Strength of Swine Manure Subjected to Aeration Treatments. Trans. of the ASAE 47(5):1659-1666. Zhu, J., A. Luo, Y. Zhou, P.M. Ndegwa, D. Schmidt. 2004. Nutrient Seepage from Operating Turkey Buildings with a Litter System. Water, Air, and Soil Pollution 155(1-4): 87-101. Ndegwa, P.M., 2004. Limitations of Orthophosphates Removal during Anaerobic Batch Treatment of Piggery Slurry. Biosystems Engineering 87(2):201-208. Zhu, J., P.M. Ndegwa, Zhang. 2004. Manure Sampling Procedures and Nutrient Estimation by the Hydrometer Method for Gestation Pigs. Bioresource Technology 92(3):243-250. Ndegwa, P.M., J. Zhu, A. Luo. 2003. Effects of Bioreactor Temperature and Time on Odor- Related Parameters in Aerated Swine Manure Slurries. J. Environ. Technology 24(8): 1007-1016. Ndegwa, P.M., J. Zhu, A. Luo, D.W. Hamilton. 2003. Enhanced Phosphorus Removal from Swine Manure in Aerated Batch Reactors. Trans. of the ASAE 46(3): 797-803. Zhu, J., P.M. Ndegwa, A. Luo. 2003. Temperature Effects on Pig Manure under Low-Level Batch Aeration. The International Journal of Environ. Studies 60(5): 523-533. Ndegwa, P.M., J. Zhu. 2003. Sampling Procedures for Piggery Slurry in Deep Pits for Estimation of Nutrient Content. Biosystems Engineering 85(2): 239-248. Ndegwa, P.M. 2003. Solids Separation Coupled With Batch-Aeration Treatment For Odor
Control From Liquid Swine Manure. J. Environ. Sci. Health B38(5): 631-643. Zhu, J., Z. Zhang, P. M. Ndegwa. 2003. Using a Soil Hydrometer to Measure the Nitrogen and Phosphorus Contents in Pig Slurries. Biosystems Engineering 85(1): 121-128. Ndegwa, P.M., J. Zhu, A. Luo. 2003. Discussions and Closure to Effects of Solids Levels and Chemical Additives on Removal of Solids and Phosphorus in Swine Manure. J. Environ. Eng.-ASCE 129(5): 485-487. Zhu, J., P. M Ndegwa, Z. Zhang. 2003. Settling Characteristics of Nursery Pig Manure and Nutrient Estimation by the Hydrometer Method. J. Environ. Sci. Health B38(3): 379-390. Zhu, J., A. Luo, Y. Zhou, P.M. Ndegwa, D. Schmidt. 2002. Barn Age Impact on Nutrient Leaching from Turkey Barns Built on Clay Loam Soils. Trans. of the ASAE 45(6): 1971-1976. Ndegwa, P.M., J. Zhu, A. Luo. 2002. Influence of temperature and time on phosphorus removal in swine manure during batch aeration. J. Environ. Sci. Health B38(1): 73-87. Luo, A., J. Zhu, P.M. Ndegwa. 2002. Influence of anaerobic pre-conditioning on phosphorus removal in swine manure by aeration. J. Water, Air, and Soil Pollution 140(1-4): 219-230. Ndegwa, P.M., J. Zhu, A. Luo. 2002. Stratification of Solids, Nitrogen and Phosphorus in Swine Manure in Deep Pits Under Slatted Floors. Bioresource Techno. 83(3): 203-211. Zhu, J., P.M. Ndegwa, A. Luo. 2002. Bacterial Responses to Temperature during Aeration of Pig Slurry. J. Environ. Sci. Health B37(3): 265-275 Luo, A., J. Zhu, P.M. Ndegwa. 2002. Removal of Carbon, Nitrogen, and Phosphorus in Pig Manure by Continuous and Intermittent Aeration at Low Redox Potentials. Biosystems Eng. 82(2): 209-215. Ndegwa, P.M., J. Zhu, A. Luo. 2002. Effects of Solids Separation and Time on the Production of Odorous Compounds in Stored Pig Slurry. Biosystems Engineering 81(1): 127-133 Thompson, S.A, P.M. Ndegwa, W.C. Merka, A. B. Webster. 2001. Reduction in Manure Weight and Volume Using an In-House Layer Manure Composting System under Field Conditions. Applied Poultry Research 10(3): 255-261. Zhu, J., P.M. Ndegwa, A. Luo. 2001. Effect of solid-liquid separation on BOD and VFAs in swine manure. J. Environmental Technology 22(10): 1237-1243. Ndegwa, P.M., J. Zhu, A. Luo. 2001. Effect of Batch Aeration-Treatment on the Solubility of Phosphorus in Pig Manure. J. Agricultural Engineering Res. 80(4): 365-371 Zhu, J., A. Luo, P.M. Ndegwa. 2001. Raising ph by Low Level Aeration for Soluble Phosphorus Removal from Swine Manure. Transactions of the ASAE 44(2): 391-396. Ndegwa, P.M., J. Zhu, A. Luo. 2001. Effects of Solids Levels and Chemical Additives on Removal of Solids and Phosphorus in Swine Manure. J. Environmental Engineering-ASCE 127(12): 1111-1115. Luo, A., J. Zhu, P.M. Ndegwa. 2001. Phosphorus Transformations in Swine Manure during continuous and intermittent Aeration Processes. Transactions of the ASAE 44(4): 967-972. Ndegwa, P.M., S.A.Thompson. 2001. Integrating Composting and Vermicomposting in the Treatment and Bioconversion of Biosolids. Bioresource Technology 76(2): 107-112. Zhu, J., A. Luo, P.M. Ndegwa. 2001. The Effect of Limited Aeration on Swine Manure Phosphorus Removal. J. Environ. Sci. Health B36(2): 209-218. Ndegwa, P.M., S.A.Thompson. 2000. Effects of C-to-N Ratio on Vermicomposting of Biosolids. Bioresource Technology 75(1): 7-12. Zhu, J., P.M. Ndegwa, A. Luo. 2000. Changes in Swine Manure Solid Components During Storage Relating to Separation Efficiency. Applied Engineering in Agriculture 16(5): 571-575.
Ndegwa, P. M., S. A. Thompson, W. C. Merka. 2000. A Dynamic Simulation Model of in-situ Composting of Caged-Layers Manure. Compost Sci. & Utilization 8(3): 190-202. Ndegwa, P.M., S.A.Thompson, K.C. Das. 1999. Effects of Stocking Density and Feeding Level on Vermicomposting of Biosolids. Bioresource Technology 71(1): 5-12. Ndegwa, P. M., S. A. Thompson, W. C. Merka. 1991. Fractionation of Poultry Litter for Enhanced Utilization. Transactions of the ASAE 34(3): 992-997. Conference Papers & Presentations Zhu, J., Z. Zhang, P. M. Ndegwa. 2003. Evaluation of the Hydrometer Method to Determine Swine Manure Nutrient Content. Presented and published in proceedings of the 9 th International Symposium on Animal, Agric. and Food Processing Wastes. Oct. 12-15, 2003, Durham, NC. Ndegwa, P.M., J. Zhu. 2003. Novel Procedures for Accurate Sampling of Swine Manures. Presented and published in proceedings of the 9 th International Symposium on Animal, Agricultural and Food Processing Wastes. October 12-15, 2003, Durham, NC. Hamilton, D.W, I.N. Kourtchev, P.M. Ndegwa, H.J. Cumba, F. Gioelli. 2003. Simulation of Anaerobic/Facultative Lagoon Performance using a 1,000-Liter Pilot Facility. ASAE Paper No. 034155. ASAE International Meeting, Las Vegas, Nevada, USA Ndegwa, P.M., 2003. Limitations of Orthophosphates Removal from Swine Manure during Batch-Aeration Treatments. ASAE Paper No. 034153. ASAE International Meeting, Las Vegas, Nevada, USA Ndegwa, P.M., J. Zhu, A. Luo. 2002. Enhanced Phosphorus Removal in Swine Manure using Aerated Batch-Reactors. ASAE Paper No. 024097. ASAE-CIGR Congress Annual International Meeting, Chicago, Illinois, USA Ndegwa, P.M., J. Zhu, A. Luo. 2001. Temperature effects on Phosphorus Removal in Swine Manure Under Aeration Treatment. ASAE Paper No. 012276. ASAE International Meeting, Sacramento, California, USA Ndegwa, P.M., J. Zhu, A. Luo. 2000. Improved Handling of Swine Manure via Chemically Enhanced Natural Sedimentation. ASAE Paper No. 004140. ASAE Intern. Meeting, Milwaukee, WI. Ndegwa, P.M., J. Zhu, A. Luo. 2000. Solids-Liquid Separation of Swine Manure for Odor Control. ASAE Paper No. 004076. ASAE International Meeting, Milwaukee, Wisconsin. Luo, A., J. Zhu, P.M. Ndegwa. 2000. Fluctuations of Phosphorus in Swine Manure during Anaerobic and Aerobic Processes. ASAE Paper No. 004122. ASAE International Meeting, Milwaukee, Wisconsin. Luo, A., J. Zhu, P.M. Ndegwa. 2000. Isolation of Bacteria able to Utilize Odorous Compounds as Sole Carbon and Energy Source from Swine Manure. ASAE Paper No. 008003. ASAE International Meeting, Milwaukee, Wisconsin. Ndegwa, P.M, S.A. Thompson, W.C. Merka. 1999. A Dynamic Simulation Model of in-situ Composting of Caged Layers Manure. Presented at Southern Poultry Science Society Conference on Avian Diseases, January 18-19, 1999 (Abstract S7). Ndegwa, P.M., S.A.Thompson, K.C. Das. 1998. Effects of Stocking Density and Feeding Level on Vermicomposting of Biosolids. Proceedings of Composting in the Southeastern Conference and Expo. Athens, GA, September 9-11. Thompson, S.A, W.C. Merka, P.M. Ndegwa. 1997. In-house Deep-Litter Manure Management
System. ASAE Paper No.974070. ASAE International Meeting, Minneapolis, MN. Thompson, S.A., W.C. Merka, P.M. Ndegwa. 1991. Fractionation of poultry litter for enhanced utilization. Presented at Conference on Environmentally Sound Agriculture. Orlando, FL, 16-18 April. Abstracts Ndegwa, P.M., S.A.Thompson. 2002. Integrating composting and vermicomposting in the treatment and bioconversion of biosolids, Fuel and Energy Abstract, 43(2): 120. Ndegwa, P.M., S.A.Thompson, and K.C. Das. 2001. Optimising for worm use. Water21, 62(November/December): 269