Conference Papers & Presentations
- Vaddella, V.K., P.M. Ndegwa, A. Jiang. 2011. A Model for Overall Mass Transfer Coefficient of Ammonia from Dilute Dairy Manure Slurries. Paper number 1110972, ASABE Annual International Meeting. Lousiville, KY, August 7-10.
- Joo, H.S., P.M. Ndegwa, A.J. Heber, J.-Q. Ni, J.C. Ramirez-Dorronsoro, E.L. Cortus. 2011. Association's Annual Conf. & Exhibition, to be held in Detroit, MI, June 16-19, 2009. Particulate matter emissions from naturally ventilated free-stall dairy barns. Air & Waste Management Association's Annual Conf. & Exhibition. Orlando, FL, June 20-24.
- V.K. Vaddella, P.M. Ndegwa, H.S. Joo. 2010. A Process-based Model for Ammonia Emissions from Storages of Flushed Dairy Manure. ASABE Intl. Symposium on Air Quality and Manure Management. Dallas, TX, September 13-15.
- V.K. Vaddella, P.M. Ndegwa, H.S. Joo. 2010. A Model for Ammonia Dissociation Constant in Dairy Manure. ASABE Intl. Symposium on Air Quality and Manure Management. Dallas, TX, September 13-15.
- V.K. Vaddella, P.M. Ndegwa, H.S. Joo. 2010. A Process-based Model for Ammonia Emissions from Storages of Flushed Dairy Manure. ASABE Annual International Meeting. Pittsburg, PA, June 20-23.
- Ndegwa, P.M., V.K. Vaddella, A.N. Hristov, H.S. Joo. 2009. Revisiting the method for measuring ammonia concentrations in ambient air or exhaust air stream using acid traps. Air & Waste Management Association's Annual Conf. & Exhibition, to be held in Detroit, MI, June 16-19, 2009.
- Ndegwa, P.M., H.S. Joo, A.J. Heber, J.C. Ramirez-Dorronsoro, E.L. Cortus, J.-Q. Ni, W.W. Bogan. A Method for determining gaseous emissions from naturally ventilated freestall dairy barns. Air & Waste Magt Association's Annual Conf. & Exhibition, to be held in Detroit, MI, June 16-19, 2009.
- V.K. Vaddella, P.M. Ndegwa, H.S. Joo. 2009. Simulation of ammonia emissions from scraped and flushed dairy manure Post-Collection Storages. ASABE Annual International Meeting. Reno, Nevada, June 21-24.
- V.K. Vaddella, P.M. Ndegwa. 2009. Ammonia Emissions from Manure Storages using urine-feces separation systems. ASABE Annual International Meeting. Reno, Nevada, June 21-24.
- V.K. Vaddella, P.M. Ndegwa. 2009. Modeling of convective mass transfer coefficient and dissociation constant for ammonia in dairy wastewater. ASABE Annual International Meeting. Reno, Nevada, June 21-24.
- Hamilton, D.W., M.E. Murie, A.M.A Khan, P.M Ndegwa. 2008. Vermicomposting of Poultry Litter: Process Optimization. ASABE Paper No: 084896. ASABE International Meeting, Rhode Island Convention Center, Providence, Rhode Island.
- Ndegwa, P.M., A.N. Hristov, J. Arogo, R.E. Sheffield. 2008. Ammonia emissions mitigation techniques for concentrated animal feeding operations. Mitigation Air Emissions from Animal Feeding Operations: Exploring the advantages, Limitations, and Economics of mitigation technologies. May 19-21, Des Moines, Iowa.
- Heber, A.J., B.W. Bogan, J.-Q. Ni, T.T. Lim, J.C. Ramirez-Dorronsoro, E.L. Cortus, C. A. Diehl, S.M. Hanni, C. Xiao, K.D. Casey, C.A. Gooch, L.D. Jacobson, J. A. Koziel, F.M. Mitloehner, P. M. Ndegwa, W. P. Robarge, L. Wang, R. Zhang. 2008. The National Air Emissions Monitoring Study: Overview of Barn Sources. The 8th International Livestock Symposium (ILES VIII), Iguassu Falls, Brazil, Aug. 31-Sept. 4.
- Ndegwa, P.M., H.S. Joo, A.J. Heber, J.C. Ramirez-Dorronsoro, E.L. Cortus, J.-Q. Ni, W.W. Bogan. 2008. A method for Determination of Pollutant Emissions from Naturally Ventilated Freestall Dairy Barns. The 8th International Livestock Symp. (ILES VIII), Iguassu Falls, Brazil, Aug. 31-Sept. 4.
- A.N. Hristov, S. Zaman, M. Vander Pol, P. Ndegwa, S. Silva, and C. Kendall. Nitrogen losses from dairy manure estimated through nitrogen mass balance or using markers. 2007 Joint Meeting of ADSA, PSA, AMPA, ASAS. San Antonio, Texas.
- Ndegwa, P.M., D.W. Hamilton, J.A. Lalman, H.J. Cumba. 2005. Treatment of low strength swine waste using anaerobic sequencing batch reactors (ASBRs). ASAE Paper No. 054081. ASAE International Meeting, Tampa, Florida, USA.
- Hamilton, D.W., S.D. Carter, P.M. Ndegwa, H.J. Cumba. 2005. Emission of nitrogenous gases from simulated swine manure stabilization ponds. ASAE Paper No. 054030. ASAE International Meeting, Tampa, Florida, USA.
- 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 9th 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 9th 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 Agric. Orlando, FL, 16‑18 April.
Dr. Pius Ndegwa
Biological Systems Engineering
Washington State University
LJSmith 202, P.O. Box 64120
Pullman, Wasington 99164-6120
Phone:
509 335-8167
Fax:
509 335-2722
Electronic Mail:
ndegwa@wsu.edu
My Cirriculum Vitae (pdf)