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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/22234

    標題: Nitrate removal and denitrification affected by soil characteristics in nitrate treatment wetlands
    作者: Ying-Feng Lin
    Shuh-Ren Jing
    Der-Yuan Lee
    Yih-Feng Chang
    Kai-Chung Shih
    貢獻者: 環境工程與科學系
    關鍵字: Constructed wetland
    nitrate removal
    redox potential
    organic carbon
    日期: 2007-03
    上傳時間: 2010-01-15 11:18:00 (UTC+8)
    摘要: Several small-scale surface flow constructed wetlands unplanted and planted (monoculture) with various macrophytes (Phragmites australis, Typha orientalis, Pennisetum purpureum, Ipomoea aquatica, and Pistia stratiotes) were established to continuously receive nitrate-contaminated groundwater. Soil characteristics and their effects on nitrate removal and soil denitrification were investigated. The results showed that planted wetland cells exhibited significantly higher (P < 0.05) nitrate removal efficiencies (70-99%) and soil denitrification rates (3.78-15.02 μ g N2O-N/g dry soil/h) than an unplanted covered wetland cell (1%, 0.11 μ g N2O-N/g/h). However, the unplanted uncovered wetland cell showed a nitrate removal efficiency (55%) lower than but a soil denitrification rate (9.12 μg N2O-N/g/h) comparable to the planted cells. The nitrate removal rate correlated closely and positively with the soil denitrification rate for the planted cells, indicating that soil denitrification is an important process for removing nitrate in constructed wetlands. The results of nitrogen budget revealed that around 68.9-90.7% of the overall nitrogen removal could be attributed to the total denitrification. The soil denitrification rate was found to correlate significantly (P < 0.01) with the extractable organic carbon, organic matter, and in situ-measured redox potential of wetland soil, which accordingly were concluded as suitable indicators of soil denitrification rate and nitrate removal rate in nitrate treatment wetlands.
    關聯: Journal of Environmental Science and Health, Part A 42(4): p.471-479
    Appears in Collections:[環境工程與科學系(所)] 期刊論文
    [觀光事業管理系(含溫泉所)] 期刊論文

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