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首页> 外文期刊>Environmental Science & Technology >Behavior of Aluminum, Arsenic, and Vanadium during the Neutralization of Red Mud Leachate by HCI, Gypsum, or Seawater
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Behavior of Aluminum, Arsenic, and Vanadium during the Neutralization of Red Mud Leachate by HCI, Gypsum, or Seawater

机译:HCl,石膏或海水中和赤泥渗滤液过程中铝,砷和钒的行为

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摘要

Red mud leachate (pH 13) collected from Ajka, Hungary is neutralized to < pH 10 by HCI, gypsum, or seawater addition. During acid neutralization >99% Al is removed from solution during the formation of an amorphous boehmite-like precipitate and dawsonite. Minor amounts of As (24%) are also removed from solution via surface adsorption of As onto the Al oxyhydroxides. Gypsum addition to red mud leachate results in the precipitation of calcite, both in experiments and in field samples recovered from rivers treated with gypsum after the October 2010 red mud spill. Calcite precipitation results in 86% Al and 81% As removal from solution, and both are nonexchangeable with 0.1 mol L~(-1) phosphate solution. Contrary to As associated with neoformed Al oxyhydroxides, EXAFS analysis of the calcite precipitates revealed only isolated arsenate tetrahedra with no evidence for surface adsorption or incorporation into the calcite structure, possibly as a result of very rapid As scavenging by the calcite precipitate. Seawater neutralization also resulted in carbonate precipitation, with >99% Al and 74% As removed from solution during the formation of a poorly ordered hydrotakite phase and via surface adsorption to the neoformed precipitates, respectively. Half the bound As could be remobilized by phosphate addition, indicating that As was weakly bound, possibly in the hydrotakite interlayer. Only 5-16% V was removed from solution during neutralization, demonstrating a lack of interaction with any of the neoformed precipitates. High V concentrations are therefore likely to be an intractable problem during the treatment of red mud leachates.
机译:从匈牙利阿伊卡(Ajka)收集的赤泥渗滤液(pH 13)通过HCl,石膏或海水中和至H 10。在酸中和过程中,在形成无定形勃姆石状沉淀物和钙铝石的过程中,从溶液中去除了> 99%的Al。还可以通过将As表面吸附在羟基氧化铝上而从溶液中除去少量的As(24%)。在红泥渗滤液中添加石膏会导致方解石沉淀,无论是在实验中还是在2010年10月红泥溢漏后从用石膏处理过的河流中回收的野外样品中。方解石的沉淀导致从溶液中去除86%的Al和81%的As,并且两者都不能与0.1 mol L〜(-1)磷酸盐溶液交换。与As与新形成的氢氧化铝相比,方解石沉淀物的EXAFS分析表明仅分离出砷酸四面体,没有证据表明表面吸附或并入方解石结构,这可能是由于方解石沉淀物非常快速地清除了As。海水中和也导致碳酸盐沉淀,在形成不良有序的水t石相期间以及通过表面吸附到新形成的沉淀物期间,从溶液中去除了> 99%的Al和74%的As。结合的砷的一半可以通过磷酸盐的添加而重新固定,这表明砷是弱结合的,可能在水晶石夹层中。在中和过程中仅从溶液中除去了5-16%的V,这表明与任何新形成的沉淀物均缺乏相互作用。因此,在赤泥渗滤液的处理过程中,高V浓度可能是一个棘手的问题。

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  • 来源
    《Environmental Science & Technology》 |2013年第12期|6527-6535|共9页
  • 作者单位

    Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K.;

    Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K.;

    Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K.;

    School of Civil Engineering, University of Leeds, Leeds LS2 9JT, U.K.;

    Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K.;

    School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, U.K.;

    Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX3 0DP, U.K.;

    Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, St. Gellert sq. 4,1111 Budapest, Hungary;

    Centre for Environmental and Marine Sciences, University of Hull, Scarborough YO11 3AZ, U.K.;

  • 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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