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Swine Wastewater Treatment in an Integrated System of Anaerobic Digestion and Duckweed Nutrient Removal

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  034151,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13893) @2003
Authors:   J. Cheng, S. Liehr, C. Lyerly
Keywords:   Ammonium, Anaerobic digester, Duckweed, Lemna gibba, Nitrogen, Nutrient removal, Phosphorous, Swine wastewater treatment

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. Duckweed (Lemna gibba 8678) was 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. This research provides an initial understanding of the attached-growth anaerobic digester and the characteristics exhibited by Lemna gibba 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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