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http://dx.doi.org/10.17820/eri.2016.3.4.221

Development and Application of Multi-Functional Floating Wetland Island for Improving Water Quality  

Yoon, Younghan (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Lim, Hyun Man (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Kim, Weon Jae (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Jung, Jin Hong (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Park, Jae-Roh (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Ecology and Resilient Infrastructure / v.3, no.4, 2016 , pp. 221-230 More about this Journal
Abstract
Multi-functional floating wetland island (mFWI) was developed in order to prevent algal bloom and to improve water quality through several unit purification processes. A test bed was applied in the stagnant watershed in an urban area, from the summer to the winter season. For the advanced treatment, an artificial phosphorus adsorption/filtration medium was applied with micro-bubble generation, as well as water plants for nutrient removal. It appeared that the efficiency of chemical oxygen demand (COD) and total phosphorus (T-P) removal was higher in the warmer season (40.9%, 45.7%) than in the winter (15.9%, 20.0%), and the removal performance (suspended solid, chlorophyll a) in each process differs according to seasonal variation; micro-bubble performed better (33.1%, 39.2%) in the summer, and the P adsorption/filtration and water plants performed better (76.5%, 59.5%) in the winter season. From the results, it was understood that the mFWI performance was dependent upon the pollutant loads in different seasons and unit processes, and thus it requires continuous monitoring under various conditions to evaluate the functions. In addition, micro-bubbles helped prevent the formation of anaerobic zones in the lower part of the floating wetland. This resulted in the water circulation to form a new healthy aquatic ecosystem in the surrounding environment, which confirmed the positive influence of mFWI.
Keywords
Artificial filtration/adsorption media; Microbubble; Multi-functional floating wetland island; Stagnant watershed; Vegetative filter;
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