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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44658

    Title: Fluidized zero valent iron bed reactor for nitrate removal
    Authors: Chen, Yi-ming;李奇旺;Li, Chi-wang;Chen, Shiao-shing
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: Nitrate reduction;Zero valent iron;Fluidized bed reactor
    Date: 2005-05-01
    Issue Date: 2010-03-26 16:37:48 (UTC+8)
    Publisher: Elsevier
    Abstract: A fluidized zero valent iron (ZVI) reactor is examined for nitrate reduction. Using the system, the pH of solution can be maintained at optimal conditions for rapid nitrate reduction. For hydraulic retention times of 15 min, the nitrate reduction efficiency increases with increasing ZVI dosage. At ZVI loadings of 33 g l−1, results indicate that the nitrate removal efficiency increases from less than 13% for systems without pH control to more than 92% for systems operated at pH of 4.0. By maintaining pH at 4.0, we are able to decrease the hydraulic retention time to 3 min and still achieve more than 87% nitrate reduction. The recovery of total nitrogen added as nitrate, ammonium, and nitrite was less than 50% for the system operated at pH 4.0, and was close to 100% for a system without pH control. The possibility of nitrate and ammonium adsorption onto iron corrosion products was ruled out by studying the behavior of their adsorption onto freshly hydrous ferric oxide at variable pH. Results indicate the probable formation of nitrogen gas species during reaction in pH 4.0.
    Relation: Chemosphere 59(6), pp.753-759
    DOI: 10.1016/j.chemosphere.2004.11.020
    Appears in Collections:[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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