Phil Westerman

Professor Emeritus

Retired 2010
  • 919-515-6742

 Philip W. Westerman was a professor, researcher and extension engineer in the Biological and Agricultural Engineering Ddepartment at North Carolina State University and is internationally recognized for his contributions to the understanding of the principal mechanisms important to animal waste management and for meticulous work in determining the basic properties of waste products and their interactions with the environment. His research publication on land treatment of animal wastes, nutrient availability for crop fertilization, effects of animal waste utilization on quality of runoff and drainage waters, and alternative waste treatment technologies are widely referenced. He has also made significant contributions in the areas of water treatment and waste management for intensive fish production systems.

He was selected as one of three NCSU faculty members to serve on a 20-member multi-disciplinary advisory panel to provide input for the development and implementation of a $17.5 million project for developing “Environmentally Superior Technologies” for management of swine manure.

The result of Westerman’s work has been applied to the development of guidelines for users, extension publications, and environmental regulations. He and a former graduate student have a patent for the “Apparatus and Method for Removing Phosphorus from Waste Lagoon Effluent.” He has authored or co-authored 200 refereed journal articles, conference proceedings, technical papers and reports, and abstracts.

Westerman is a Fellow member of ASAE, and has a long record of continuous committee work involving the Structures and Environment and Soil and Water divisions. He has served as associate editor for both divisions, and chaired the Agricultural Waste Management (SE-412), Land Application of Waste (SW-263) committees and the Fellows (E-08)committee.

He has received citations for excellence in manuscript review by both ASABE and the Journal for Environmental Quality. Other awards and honors include a USDA Honors award; University of Kentucky – Alpha Epsilon Outstanding Alumni award; NC Cooperative Extension Service – Extension Education award; and he received the ASABE Gunlogson Countryside Engineering Award for his outstanding contributions to the agricultural community through the development of livestock waste management and treatment systems. Ho also received a Certificate of Appreciation that honors his program committee work involved with three international symposia on agricultural and food processing wastes, one as program chair.


Ph.D. 1974

Agricultural Engineering

University of Kentucky

M.S. 1972

Agricultural Engineering

University of Kentucky

B.S. 1969

Agricultural Engineering

University of Kentucky


Acidifier application rate impacts on ammonia emissions from US roaster chicken houses
Shah, S. B., Grimes, J. L., Oviedo-Rondón, E. O., & Westerman, P. W. (2014), Atmospheric Environment, 92, 576–583.
Acidifier dosage effects on inside ammonia concentrations in roaster houses
Shah, S., Oviedo-Rondon, E. O., Grimes, J. L., Westerman, P. W., & Campeau, D. (2013), Applied Engineering in Agriculture, 29(4), 573–580.
Ancillary effects of different acidifier application rates in roaster houses
Shah, S. B., Westerman, P. W., Grimes, J. L., Oviedo-Rondon, E. O., & Campeau, D. (2013), The Journal of Applied Poultry Research, 22(3), 565–573.
Live performance of roasters raised in houses receiving different acidifier application rates
Oviedo-Rondon, E. O., Shah, S. B., Grimes, J. L., Westerman, P. W., & Campeau, D. (2013), The Journal of Applied Poultry Research, 22(4), 922–928.
Nitrogen mass balance in commercial roaster houses receiving different acidifier application rates
Shah, S. B., Grimes, J. L., Oviedo-Rondon, E. O., Westerman, P. W., & Campeau, D. (2013), JOURNAL OF APPLIED POULTRY RESEARCH, 22(3), 539–550.
Ammonia emissions from broiler cake stockpiled in a naturally ventilated shed
Yao, H., Shah, S., Willits, D. H., Westerman, P. W., Li, L. W., & Marshall, T. K. (2011), Transactions of the ASABE, 54(5), 1893–1904.
Phosphorus recovery from covered digester effluent with a continuous-flow struvite crystallizer
Westerman, P. W., Bowers, K. E., & Zering, K. (2010), Applied Engineering in Agriculture, 26(1), 153–161.
Swine anaerobic lagoon nutrient concentration variation with season, lagoon level, and rainfall
Westerman, P. W., Ogejo, J. A., & Grabow, G. L. (2010), Applied Engineering in Agriculture, 26(1), 147–152.
Impact of land application method on ammonia loss from hog lagoon effluent
Shah, S., Balla, B. K., Grabow, G. L., Westerman, P. W., & Bailey, D. E. (2009), Applied Engineering in Agriculture, 25(6), 963–973.
Design and evaluation of a regenerating scrubber for reducing animal house emissions
Shah, S., Westerman, P. W., Munilla, R. D., Adcock, M. E., & Baughman, G. R. (2008), Transactions of the ASABE, 51(1), 243–250.

View all publications via NC State Libraries


Effective Strategies for Biogas and Nutrient Management Resulting from Anaerobic Digestion in Covered Swine Lagoons
US Dept. of Agriculture (USDA)(9/01/08 - 6/30/12)
Litter Amendment and Improved Diet Impacts on Broiler Ammonia Emissions and Productivity
US Dept. of Agriculture (USDA)(1/01/06 - 12/31/10)
Waste Management in Hog Lagoons Using Bio-Magic
Blue and Green Solutions, Inc.(9/15/09 - 12/15/09)
Phosphorus Recovery From Concentrated Wastewater With a Continuous-Flow Struvite Crystallizer
National Pork Board(5/01/07 - 5/01/09)
Manure and Nutrient Characterization for Flushed Manure for Use in Design Criteria for Innovative Treatment Technologies
NC Pork Council(7/01/06 - 6/30/07)
Determining Plant-Available Nitrogen in Hog Anaerobic Lagoon Effluent Applied with Traveling Gun and Drag Hose Systems
NCSU Water Resources Research Institute(6/01/05 - 12/31/06)
A Regenerating Scrubber for Reducing Animal House Emissions
NCSU Animal and Poultry Waste Management Center(10/01/04 - 6/30/06)