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Algae and Nutrient Removal by Vegetated Artificial Floating Island  

Park, Sun-Koo (Research of Limnology, ASSUM)
Cho, In-Ki (Research of Limnology, ASSUM)
Kwon, Oh-Byung (Research of Limnology, ASSUM)
Mun, Jung-Soo (Department of Civil and Environmental Engineering, Seoul National University)
Um, Han-Yong (Rural Research Institute)
Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
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Abstract
We investigated the effect on the removal of BOD, SS, TN and TP and algal growth inhibition of Vegetated Artificial Floating Island (VAFI), by examining microorganism activity and nutrient uptake in the batch test of various conditions: (1) Blank (Control group), (2) VAFI of $0.25m^2$, (3) AFI of $0.25m^2$ which has no vegetation, (4) buoyant plate of $0.25m^2$, (5) buoyant plate of $0.25m^2$ with linear media. The proportion of BOD removal in the VAFI, AFI, buoyant plate and buoyant plate with media were 82.7, 80.8, 45.2% and 59.6% respectively. TN removal in the VAFI, AFI and buoyant plate with media were 51.2, 31.7% and 25.1% respectively. TP removal in the VAFI, AFI, buoyant plate and buoyant plate with media were 23.3, 16.7, 10.0% and 13.3% respectively. Chlorophyll-${\alpha}$ removal in the VAFI was 97.9%. The factors of chlorophyll-${\alpha}$ removal in the VAFI accounted for the shading effect of 35.1%, microorganisms activity of 61%, and plant root of 1.8%.
Keywords
artificial floating island; algae; nutrient; lake; water quality;
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