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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/21697

    標題: Nitrate removal from groundwater using constructed wetlands under various hydraulic loading rates
    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
    Hydraulic loading rate
    日期: 2008-11
    上傳時間: 2009-10-05 14:13:11 (UTC+8)
    摘要: This study set up two flow-through pilot-scale constructed wetlands with the same size but various flow patterns (free water surface flow (FWS) and subsurface flow (SSF)) to receive a nitrate-contaminated groundwater. The effects of hydraulic loading rate (HLR) on nitrate removal as well as the difference in performance between the various types of wetlands were investigated. Nitrate removal rates of both wetlands increased with increasing HLR until a maximum value was reached. The maximum removal rates, occurred at HLR of 0.12 and 0.07 m d−1, were 0.910 and 1.161 g N m−2 d−1 for the FWS and SSF wetland, respectively. After the maximum values were reached, further increasing HLR led to a considerable decrease in nitrate removal rate. Nitrate removal efficiencies remained high (>85%) and effluent nitrate concentrations always satisfied drinking water standard (<10 mg NO3–N L−1) when HLR did not exceed 0.04 m d−1 for both FWS and SSF wetlands. The first-order nitrate removal rate constant tends to decrease with increasing HLRs. The FWS wetland provided significantly higher (p < 0.05) organic carbon in effluent than the SSF wetland, while the SSF wetland exhibited significantly (p < 0.05) lower effluent DO than the FWS wetland. However, there was no significant difference (p > 0.05) in nitrate removal performance between the two types of constructed wetlands in this study except in one trial operating at HLR of 0.06–0.07 m d−1.
    關聯: Bioresource Technology 99(16):p.7504-7513
    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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