Growing duckweed in swine wastewater for nutrient recovery and biomass production |
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Authors: | Jiele Xu Genxiang Shen |
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Affiliation: | a Department of Biological and Agricultural Engineering, Campus Box 7625, North Carolina State University, Raleigh, NC 27695-7625, USA b Research Institute of Ecology and Toxicology, Shanghai Academy of Environmental Sciences, Shanghai 200233, China |
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Abstract: | Spirodela oligorrhiza, a promising duckweed identified in previous studies, was examined under different cropping conditions for nutrient recovery from swine wastewater and biomass production. To prevent algae bloom during the start-up of a duckweed system, inoculating 60% of the water surface with duckweed fronds was required. In the growing season, the duckweed system was capable of removing 83.7% and 89.4% of total nitrogen (TN) and total phosphorus (TP) respectively from 6% swine lagoon water in eight weeks at a harvest frequency of twice a week. The total biomass harvested was 5.30 times that of the starting amount. In winter, nutrients could still be substantially removed in spite of the limited duckweed growth, which was probably attributed to the improved protein accumulation of duckweed plants and the nutrient uptake by the attached biofilm (algae and bacteria) on duckweed and walls of the system. |
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Keywords: | Biomass production Duckweed Nutrient recovery Spirodela oligorrhiza Swine wastewater |
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