Abstract
Abstract As a major swine-producing state, North Carolina (United States) has adopted incentives for energy recovery from swine waste and environmental performance standards for new swine facilities. However, there are no treatment performance requirements for existing farms; therefore, management of swine waste in open lagoons with spray irrigation for disposal is nearly universal in North Carolina. Emissions of nitrogen to the atmosphere and the landscape from large industrial swine farms have led to concerns over the impact on environmental quality and human health. Accordingly, there has been increasing interest in developing alternate treatment methods for swine waste, including methods that allow for energy recovery. To evaluate the technical feasibility and limitations of coupling biological nitrogen removal with anaerobic digestion of swine waste for energy recovery, we operated a pilot nitrification/denitrification system at an 8,000-head finishing farm already practicing full-scale anaerobic dig...
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