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Feasibility of Aquatic Plants (Eichhornia crassipes and Water dropwort) for Nutrients Removal  

Choi, Don-Hyeok (Sihwa Lake Environmental Management Center, Korea Water Resources Corporation)
Kang, Ho (Civil and Environmental Engineering, Chungnam National University)
Lee, Mi-Kyung (Sihwa Lake Environmental Management Center, Korea Water Resources Corporation)
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Abstract
Feasibility of floating aquatic plants (Eichhornia crassipes and Water dropwort) was investigated in order to control of sewage depending on various initial loading in a lab scale test. In addition, field test was conducted to assess the uptake rate of nutrient by E. crassipes. Lab-scale test applying primary domestic effluent operated at 4 day HRT shows that the highest uptake rates were 1.06 g N/$m^2{\cdot}day$ and 0.39 g P/$m^2{\cdot}day$ in the E. crassipes reactor. BOD removal efficiency in E. crassipes reactor was as high as 80% when the loading value was lower than 185 kg BOD/$ha{\cdot}day$. While 70 ~ 80% removal efficiency of BOD was achieved when the loading value was lower 80 kg BOD/$ha{\cdot}day$ at the W. Dropwort reactor. Experiment results show that E.crassipes has a higher nutrients removal efficiency than W. dropwort under high pollutant loading. Input loadings of TN and TP should not exceed to 10 kg TN/$ha{\cdot}day$ and 2.0 kg TP/$ha{\cdot}day$ respectively to provide a 50% TN and 80% TP removal efficiencies using E. crassipes. The field test demonstrated that an annual yield of E. crassipes mass was estimated as a fresh weight of 30.9 $m^3/ha{\cdot}yr$. E. crassipes grown in field pads absorbed 76.7 kg N/$ha{\cdot}yr$ and 13.4 kg P/$ha{\cdot}yr$ as a dry weight.
Keywords
Aquatic plants; Eichhornia crassipes; Water dropwort; Uptake rate; Nutrients;
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Times Cited By KSCI : 3  (Citation Analysis)
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