Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6302612 | Ecological Engineering | 2013 | 6 Pages |
Abstract
The nutrient removal and biomass production with duckweed Wolffia arrhiza was assessed using laboratory-scale continuous-flow mesocosms fed with model wastewater. Average removal rates of nitrogen and phosphorus by vegetative fronds were 0.03-0.18Â mg-N/m2/d and 0.023-0.079Â mg-P/m2/d, respectively. The maximum production rates of the vegetative fronds and the turions were respectively 86-160Â g-wet/m2/d and 55-64Â g-wet/m2/d, depending on the nutrient concentration. The kinetic data of the biomass and nutrient concentrations were analyzed using a mathematical model, which showed that the maximum specific growth rate of W. arrhiza was 0.35-0.38Â dâ1, whereas the turion formation was induced when the specific growth rate decreased below 0.085-0.12Â dâ1 in low-nitrogen conditions. The model developed in this study is applicable for predicting the wastewater treatment performance and biomass production of preferential biomass, the protein-rich vegetative fronds, the starch-rich turions, or total biomass of W. arrhiza.
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Authors
Satoshi Soda, Yusuke Kawahata, Yuichiro Takai, Daisuke Mishima, Masanori Fujita, Michihiko Ike,