Characteristics of Nutrient Uptake by Water Plants in Free Water Surface Constructed Wetlands for Treating Non-point Source Pollution
2011
Kang, S.W., Sunchon National University, Sunchon, Republic of Korea | Seo, D.C., Sunchon National University, Sunchon, Republic of Korea | Choi, I.W., Sunchon National University, Sunchon, Republic of Korea | Lee, J.B., Yeongsan River Environmental Research Center, National Institute of Environmental Research Ministry of Environment, Gwangju, Republic of Korea | Lim, B.J., Yeongsan River Environmental Research Center, National Institute of Environmental Research Ministry of Environment, Gwangju, Republic of Korea | Park, J.H., Yeongsan River Environmental Research Center, National Institute of Environmental Research Ministry of Environment, Gwangju, Republic of Korea | Kim, K.S., Yeongsan River Environmental Research Center, National Institute of Environmental Research Ministry of Environment, Gwangju, Republic of Korea | Kim, S.D., Yeongsan River Environmental Research Center, National Institute of Environmental Research Ministry of Environment, Gwangju, Republic of Korea | Heo, J.S., Gyeongsang National University, Jinju, Republic of Korea | Cho, J.S., Sunchon National University, Sunchon, Republic of Korea
BACKGROUND: Generally, water plants may play an important role in nutrients(N, P) removal in constructed wetlands(CWs). Previous studies considered nutrients uptake by water plants in various CWs for treating point source pollution. On the other hand, few studies considered nutrients uptake by water plants in free water surface(FWS) CWs for treating non-point source pollution. METHODS AND RESULTS: To investigate characteristics of nutrient uptake by water plants in FWS CWs, dry weights, nutrients content and nutrients uptake by water plants were investigated from April, 2008 to October, 2008. Dominance plants were Phragmites japonica STEUD (PHRJA), Nymphaea tetragona ANGUSTA(NTMTE), Typha orientalis PRESL(TYHOR), Phragmites communis TRINIUS(PHRCO) and Zizanis latifolia TURCZ(ZIZLA) in FWS CWs. The dry weights of water plants in August were higher in the order of TYHOR(54.27 g/plant) greater than PHRJA(44.30 g/plant) greater-than or equal to PHRCO(39.60 g/plant) greater-than or equal to ZIZLA(37.80 g/plant) ≒ NTMTE(36.75 g/plant). The T-N and T-P contents by water plants were not significantly differences regardless of cultivation period. The maximum amount of T-N uptake by water plants in August were 773 mg/plant for PHRJA, 625 mg/plant for NTMTE, 1206 mg/plant for TYHOR, 754 mg/plant for PHRCO and 768 mg/plant for ZIZLA. The maximum amounts of T-P uptake by PHRJA, NTMTE, TYHOR, PHRCO and ZIZLA were 397, 177, 411, 261 and 229 mg/plant in August, respectively. CONCLUSION(s): The results of this study suggest that optimum water plant was Typha orientalis PRESL in free water surface constructed wetlands.
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