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Role of Internal Nutrient Storage in Duckweed for Secondary Swine Wastewater Treatment

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

Citation:  Paper number  024130,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10499) @2002
Authors:   Sumate Chaiprapat, Jiayang Cheng, John J. Classen, Sarah K. Liehr
Keywords:   Duckweed, Spirodela punctata, Internal nutrient, Nutrient storage, Growth

This study aims to investigate a relationship of duckweed growth with nitrogen and phosphorus concentrations in swine wastewater and nitrogen and phosphorus content in duckweed biomass. Batch tests of Spirodela punctata cultured in SAM were conducted in a temperaturecontrolled growth chamber with 16-hour photoperiod. Results showed that there was an irregular lag period that growth continued after the nutrient concentration in the medium was exhausted. Prediction of growth using medium concentration as an independent variable therefore cannot describe this behavior. Luxury consumption, which suggests internal nutrient storage, was identified as key to connect growth with the nutrient uptake process. During 30-day growing period, nitrogen and phosphorus content varied from 59.7 to 19.7 mg/g and from 14.8 to 6.8 mg/g, respectively. Patterns of nutrient uptake in relation to internal nutrient storage were discussed.

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