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首页> 外文学位 >Electrochemical remediation of radionuclide- and trichloroethene-contaminated groundwater using zero-valent iron/iron oxides and mineralogical characterization of iron hydroxides formed from zero-valent iron.
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Electrochemical remediation of radionuclide- and trichloroethene-contaminated groundwater using zero-valent iron/iron oxides and mineralogical characterization of iron hydroxides formed from zero-valent iron.

机译：使用零价铁/氧化铁对放射性核素和三氯乙烯污染的地下水进行电化学修复，以及由零价铁形成的氢氧化铁的矿物学表征。

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摘要

Although the zero-valent iron (Fe0)-based reactive barrier has been introduced as a cost-effective remediation technology for groundwaters contaminated by chlorinated organic compounds and reducible metals, the current approach of the technology has been criticized for its low process efficiency (reaction rate) and the effective life of the medium (longevity). The objectives of this study are to (1) develop and evaluate electro-enhanced technology using Fe0 for mobile radionuclides and trichloroethene in groundwater, (2) develop and evaluate an iron-oxide-based electroremediation for TCE-contaminated groundwater, (3) perform mineralogical characterization of the precipitates formed during contaminated groundwater treatment, and (4) understand the mechanisms of the chemical processes involved in Fe0 oxidation and the effect of cations and anions on the initial precipitation and subsequent phase transformation of the precipitates.; Application of direct current on the Fe0 medium column results in a significant enhancement of the dechlorination rate of TCE and the longevity of Fe0 as a reductive medium for radionuclides. Several factors affect the removal of radionuclides and TCE, including (1) electrode configuration, (2) applied voltage and current, (3) distance between cathode and anode, (4) material used as electrodes, and (5) influent concentration and water chemistry. Direct current applied to palladized multiphasic iron oxide minerals not only increases the efficiency and effective life of the medium by controlling iron oxidation but also increases the dechlorination rate of solvents by providing an external supply of electrons. The mineralogical characterization of the precipitates in reactive Fe0 columns shows that the principal corrosion products are magnetite, intermediate products (green rusts), and hydrated forms of ferric oxides, such as akaganeite (β-FeOOH), goethite (α-FeOOH), or lepidocrocite (γ-FeOOH), depending on the degree of oxidation and the chemical environment. These amorphous and crystalline minerals formed on the reactive medium and reduced the effectiveness and porosity of the Fe0 medium. A pyroaurite-type mineral was synthesized as a host iron mineral for the radionuclides through anodic corrosion of iron from Fe0 foam. The electrochemical synthesis of a crystalline pyroaurite-type mineral could be an effective and economical approach to remediating groundwaters contaminated by uranium, technetium, and other reducible heavy metals.
机译：尽管已经引入了基于零价铁（Fe 0 ）的反应性屏障，作为一种经济高效的补救方法，用于治理被氯代有机化合物和可还原金属污染的地下水，但该技术的当前方法是因其工艺效率低（反应速率）和介质的有效寿命（寿命）而受到批评。这项研究的目的是（1）开发和评估Fe0用于地下水中移动放射性核素和三氯乙烯的电子增强技术，（2）开发和评估对三氯乙烯（TCE）污染的地下水进行的基于铁氧化物的电修复，（3）执行（4）了解Fe 0 氧化过程涉及的化学过程机理以及阳离子和阴离子对初始沉淀和后续相变的影响沉淀物。在Fe 0 介质柱上施加直流电可显着提高TCE的脱氯速率，并延长Fe 0 作为放射性核素的还原介质的寿命。影响放射性核素和TCE去除的几个因素，包括（1）电极配置，（2）施加的电压和电流，（3）阴极和阳极之间的距离，（4）用作电极的材料以及（5）进水浓度和水化学。施加到钯化多相氧化铁矿物质上的直流电不仅可以通过控制铁的氧化来提高介质的效率和有效寿命，而且可以通过提供外部电子来提高溶剂的脱氯速率。 Fe 0 活性柱中沉淀物的矿物学特征表明，主要腐蚀产物是磁铁矿，中间产物（生铁锈）和水合形式的三氧化二铁，例如赤铁矿（β-FeOOH），针铁矿（α-FeO​​OH）或纤铁矿（γ-FeOOH），具体取决于氧化程度和化学环境。这些无定形和晶体矿物形成在反应性介质上，从而降低了Fe 0 介质的有效性和孔隙率。通过Fe 0 泡沫对铁的阳极腐蚀，合成了焦铁矿型矿物作为放射性核素的主体铁矿物。结晶焦铁石型矿物的电化学合成可能是一种有效且经济的方法，用于修复被铀，tech和其他可还原重金属污染的地下水。

著录项

  • 作者

    Roh, Yul.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Agriculture Soil Science.; Environmental Sciences.; Mineralogy.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;环境科学基础理论;矿物学;
  • 关键词

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