title: Nutrient recovery from swine lagoon water by Spirodela punctata.
abstract: Spirodela punctata 7776, the best duckweed strain in total protein production selected from in vitro screening experiments with synthetic swine lagoon water medium was examined for N and P recovery. It has shown a capability to grow in and to remove N and P from synthetic swine lagoon water with high N (240 mg NH4 N/l) and P (31.0 mg PO4 P/l) levels. A lag period of approximately 96 h was observed before the duckweed started to grow. During the lag period, utilization of N and P by the duckweed was very slow. The rates of N and P uptake, and duckweed growth increased with the increase of the initial N and P concentrations in the medium. The highest rates of N and P uptakes, and duckweed growth observed in this study were 0.955. 0.129 mg/l-h, and 1.33 g/m2-h (or 31.92 g/m2-day), respectively. The N:P ratio in swine lagoon water is adequate for growing the duckweed.
authors.affiliation: Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh 27695-7625, USA. jay_cheng@ncsu.edu
authors.forename: Jiayang
authors.initials: J
authors.lastname: Cheng
authors.forename: Ben A
authors.initials: BA
authors.lastname: Bergmann
authors.forename: John J
authors.initials: JJ
authors.lastname: Classen
authors.forename: Anne M
authors.initials: AM
authors.lastname: Stomp
authors.forename: James W
authors.initials: JW
authors.lastname: Howard
mesh_terms: D000818:Animals; D019684:Magnoliopsida / Q000502:physiology*; D010758:Phosphorus / Q000032:analysis / Q000378:metabolism; D011506:Proteins / Q000032:analysis / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000378:metabolism; D013552:Swine; D014481:United States; D018508:Water Purification / Q000379:methods*
chemical_list: D011506:Proteins; D000644:Quaternary Ammonium Compounds; D010758:Phosphorus