John Classen

Associate Professor

  • 919-515-6755
  • Weaver Administration Bldg 112
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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


Spatial and temporal variations of atmospheric chemical condition in the Southeastern US
Cheng, B., Wang-Li, L., Classen, J., Meskhidze, N., & Bloomfield, P. (2021), ATMOSPHERIC RESEARCH, 248.
Sustainable Swine Manure Management: A Tale of Two Agreements
Deviney, A., Classen, J., Bruce, J., & Sharara, M. (2020), Sustainability, 13(1), 15.
Effects of Co-occurring Species Present in Swine Lagoons on Adsorption of Copper on Eggshell
Hess, B. J., Kolar, P., Classen, J. J., Knappe, D., & Cheng, J. J. (2019), INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH, 13(4), 613–622.
Physicochemical data of p-cresol, butyric acid, and ammonia
Kolar, P., Classen, J., & Hall, S. G. (2019, October), DATA IN BRIEF, Vol. 26.
The Development of the INFEWS-ER: A Virtual Resource Center for Transdisciplinary Graduate Student Training at the Nexus of Food, Energy, and Water
Rodriguez, L. F., Marshall, A.-M., Cotton, D., Koelsch, R., Koziel, J., Meyer, D., … Saundry, P. D. (2019), FRONTIERS IN ENVIRONMENTAL SCIENCE, 7.
Valorization of Swine Manure into Hydrochars
Lentz, Z., Kolar, P., & Classen, J. J. (2019), PROCESSES, 7(9).
Evaluation of waste eggshells for adsorption of copper from synthetic and swine wastewater
Hess, B. J., Kolar, P., Classen, 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., & 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., Cheng, J., Rose, R., Classen, J., & Simmons, O. D. (2017), Applied Biochemistry and Biotechnology, 181(3), 1080–1095.

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Infrastructure Improvements to Lagoons at Back Bay National Wildlife Refuge, VA
(3/28/19 - 12/31/22)
Fate, Transport and Transformation of Ammonia Emissions from Animal Feeding Operations and Their Impacts on Air-Soil Health
(8/15/18 - 7/31/22)
Urea Recovery and Urease Inhibition from Pilot Scale Scraper System
(3/01/17 - 8/15/21)
Mitigating Environmental Stress for Enhanced Broiler Production Performance and Welfare
(3/01/17 - 2/28/22)
Ammonia Recovery from Swine Wastewater with Selective Membrane Technology
(9/20/12 - 8/31/16)
Ammonia Recovery from Swine Wastewater with Selective Membrane Technology
(9/20/12 - 8/31/16)
A Research Initiative to Develop Advanced Bio-Processing of Organic Residuals
(7/01/14 - 6/30/15)
Ammonia Recovery from Swine Wastewater with Selective Membrane Technology
(9/20/12 - 8/31/16)
Modeling Airflow in the Brooks Gasification Process
(3/01/12 - 9/30/12)
Swine Lagoon Sludge Processing with the Brooks Gasification Unit
(10/01/11 - 9/30/12)