Nutrient recovery from swine lagoon water by Spirodela punctata.
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.
Cheng
Jiayang
J
Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh 27695-7625, USA. jay_cheng@ncsu.edu
Bergmann
Ben A
BA
Classen
John J
JJ
Stomp
Anne M
AM
Howard
James W
JW
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*
D011506:Proteins; D000644:Quaternary Ammonium Compounds; D010758:Phosphorus