John Classen

Associate Professor

  • 919-515-6755
  • Weaver Administration Bldg 112
  • View CV


Ph.D 1995

Agricultural Engineering

Texas A&M University

M.S. 1990

Agricultural Engineering

University of Arkansas

B.S. 1987

Agricultural Engineering

University of Arkansas

Research Description

Animal waste management, nutrient recovery and sustainable food production and distribution.

Honors and Awards

  • College of Engineering Outstanding Faculty Mentoring Citation, 2016
  • Inducted to Arkansas Academy of Biological and Agricultural Engineers, 2007


Evaluation of waste eggshells for adsorption of copper from synthetic and swine wastewater
Hess, B. J., Kolar, P., Classen, J. J., Knappe, D., & Cheng, J. J. (2018), Transactions of the ASABE, 61(3), 967–976.
Approaches to agricultural innovation and their effectiveness
Kick, E. L., Zering, K., & Classen, J. (2017), Aims Agriculture and Food, 2(4), 370–373.
Catalytic valorization of lignin using niobium oxide
Das, L., Kolar, P., Sharma-Shivappa, R., Classen, J. J., & Osborne, J. A. (2017), Waste and Biomass Valorization, 8(8), 2673–2680.
Modeling the growth of archaeon halobacterium halobium affected by temperature and light
Lu, H., Yuan, W. Q., Cheng, J., Rose, R. B., Classen, J. J., & Simmons, O. D. (2017), Applied Biochemistry and Biotechnology, 181(3), 1080–1095.
Thermochemical conversion: A prospective swine manure solution for North Carolina
Lentz, Z., Classen, J., & Kolar, P. (2017), Transactions of the ASABE, 60(3), 591–600.
Size distributions of bioaerosols in an egg production facility and its vicinity
Hu, D., Wang-Li, L. J., Simmons, O. D., Classen, J. J., & Osborne, J. A. (2016), Environmental Engineering Science, 33(4), 215–223.
Swine manure char as an adsorbent for mitigation of p-Cresol
Fitzgerald, S., Kolar, P., Classen, J., Boyette, M., & Das, L. (2015), Environmental Progress & Sustainable Energy, 34(1), 125–131.
Ammonia fate and transport mechanisms in broiler litter
Liang, W. Z., Classen, J. J., Shah, S. B., & Sharma-Shivappa, R. (2014), Water, Air, and Soil Pollution, 225(1).
Bioaerosol concentrations and emissions from tunnel-ventilated high-rise layer houses in North Carolina
Hu, D., Wang-Li, L., Simmons, O. D., Classen, J. J., Osborne, J. A., & Byfield, G. E. (2014), Transactions of the ASABE, 57(3), 915–925.
Drying temperature - duration impacts on moisture, carbon, and nitrogen losses from broiler litter
Liang, W., Shah, S. B., Classen, J., & Sharma-Shivappa, R. (2014), Agricultural Engineering International: CIGR Journal, 16(4), 16–23.

View all publications via NC State Libraries

View publications on Google Scholar


Fate, Transport and Transformation of Ammonia Emissions from Animal Feeding Operations and Their Impacts on Air-Soil Health
National Science Foundation (NSF)(8/15/18 - 7/31/21)
Urea Recovery and Urease Inhibition from Pilot Scale Scraper System
Precision Fabricating & Cleaning Co.(3/01/17 - 8/15/21)
Mitigating Environmental Stress for Enhanced Broiler Production Performance and Welfare
US Dept. of Agriculture (USDA) - National Institute of Food and Agriculture(3/01/17 - 2/29/20)
Ammonia Recovery from Swine Wastewater with Selective Membrane Technology
Murphy-Brown, LLC (was Murphy Farms)(9/20/12 - 8/31/16)
Ammonia Recovery from Swine Wastewater with Selective Membrane Technology
NC Pork Council(9/20/12 - 8/31/16)
A Research Initiative to Develop Advanced Bio-Processing of Organic Residuals
NCSU Research and Innovation Seed Funding Program(7/01/14 - 6/30/15)
Ammonia Recovery from Swine Wastewater with Selective Membrane Technology
US Dept. of Agriculture (USDA)(9/20/12 - 8/31/16)
Modeling Airflow in the Brooks Gasification Process
US Dept. of Agriculture (USDA)(3/01/12 - 9/30/12)
Swine Lagoon Sludge Processing with the Brooks Gasification Unit
US Dept. of Agriculture (USDA)(10/01/11 - 9/30/12)
Manure Belt Collection System and Energy Recovery System
US Dept. of Agriculture (USDA)(9/22/10 - 9/30/15)