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Title: Swine Wastewater Treatment in an Integrated System of Anaerobig Digestion and Duckweed Nutrient Removal: Pilot Study
Authors: Lyerly, Courtney Neil
Advisors: Sarah Liehr, Committee Member
Jiayang Cheng, Committee Chair
Francis de los Reyes, Committee Member
Keywords: Nitrogen
Nutrient removal
Swine wastewater treatment
Anaerobic digester
Lemna gibba
Spirodela punctata
Lemna Minor
Issue Date: 13-Apr-2005
Degree: MS
Discipline: Biological and Agricultural Engineering
Abstract: Organics destruction and nutrient uptake in an integrated pilot system of anaerobic digestion and duckweed nutrient removal for swine wastewater treatment were monitored under field conditions. Raw swine wastewater of 100 gallons/day was first treated in a 1,000-gallon anaerobic digester with floating ballast rings. Organic compounds in the wastewater were digested to produce biogas. Many nutrients including nitrogen and phosphorus remain in the effluent of the anaerobic digester. Three duckweeds (Lemna gibba 8678, Lemna minor 8627, and Spirodela, punctata 7776) were grown in three 1,000- gallon tanks to recover nutrients from the anaerobic effluent. The duckweed was periodically harvested and can be used as animal, poultry, and fish feed. The Three species were compared for growth and nutrient removal characteristics. This research provides an initial understanding of the attached-growth anaerobic digester and the characteristics exhibited by duckweed in the treatment of swine wastewater under conditions similar to those found in North Carolina. Both the anaerobic digester and the duckweed tanks were run as completely mixed systems. The performance of the system was monitored by measuring chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN), ammonia nitrogen, total phosphorus (TP), ortho-phosphate-phosphorus, and pH in the influent and effluent of each treatment unit.
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