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首页> 外文期刊>Environmental Science & Technology >Effect of Aging on Phosphorus Speciation in Surface Deposit of a Vertical Flow Constructed Wetland
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Effect of Aging on Phosphorus Speciation in Surface Deposit of a Vertical Flow Constructed Wetland

机译：时效对垂直流人工湿地表层沉积物中磷形态的影响

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摘要

This study was conducted to determine phosphorus (P) species captured in a vertical-flow constructed wetland (VFCW) system combining a trickling filter followed by FeCl_3 injection for phosphate coagulation. Suspended solids (SS) thus formed accumulated over time at the VFCW surface and transformed into a sludge deposit layer, which was shown to concentrate most of the P captured in the system. In order to investigate the effect of aging on P species, representative SS and sludge samples were taken from a wastewater treatment plant that had been in operation for 8 years and analyzed using P fractionation, solution 31P NMR spectroscopy, and P and Fe K-edge XANES spectroscopy. A partial mineralization of organic matter was shown by comparing organic carbon contents of SS and sludge materials. Chemical fractionations combined with P and Fe K-edge XANES spectroscopy showed that P was predominantly bound to iron within both samples in the form of ferric phosphate, rather than adsorbed onto ferric oxyhydroxide. Calcium-bound P was more significantly observed in sludge than in SS, suggesting that aging induced the recombination of part of the organic and iron-bound P species into calcium-bound forms, as a possible consequence of the partial mineralization of organic matter.
机译：进行这项研究来确定在垂直流人工湿地（VFCW）系统中捕获的磷（P）种类，该系统结合滴滤池，然后注入FeCl_3进行磷酸盐混凝。这样形成的悬浮固体（SS）随时间在VFCW表面积累，并转化为污泥沉积层，这表明该固体会浓缩系统中捕获的大部分P。为了研究老化对P种类的影响，从已经运行了8年的废水处理厂中提取了代表性的SS和污泥样品，并使用P分级，溶液31P NMR光谱以及P和Fe K-edge进行了分析。 XANES光谱。通过比较SS和污泥材料的有机碳含量，可以看出有机物的部分矿化。化学分馏结合P和Fe K-edge XANES光谱表明，两个样品中的P主要以磷酸铁的形式与铁结合，而不是吸附在羟基氧化铁上。与SS相比，污泥中钙结合的P更为明显，这表明老化会导致部分有机和铁结合的P物种重组为钙结合的形式，这可能是有机物部分矿化的结果。

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  • 来源
    《Environmental Science & Technology》 |2015年第8期|4903-4910|共8页
  • 作者

    Boram Kim; Mathieu Gautier; Camille Rivard; Corinne Sanglar; Philippe Michel; Remy Gourdon;

  • 作者单位

    INSA Lyon, University of Lyon, LGCIE-DEEP, 20 av. A. Einstein, 69621 Villeurbanne cedex, France,SCIRPE, 5 Allee Alban Vistel, 69110 Sainte-Foy-Les-Lyon, France;

    INSA Lyon, University of Lyon, LGCIE-DEEP, 20 av. A. Einstein, 69621 Villeurbanne cedex, France;

    ESRF, European Synchrotron Radiation Facility, 38000 Grenoble, France;

    Universite de Lyon, CNRS, Institut des Sciences Analytiques, 5 rue de la Doua, 69100 Villeurbanne, France;

    SCIRPE, 5 Allee Alban Vistel, 69110 Sainte-Foy-Les-Lyon, France;

    INSA Lyon, University of Lyon, LGCIE-DEEP, 20 av. A. Einstein, 69621 Villeurbanne cedex, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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