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首页> 外文期刊>Environmental Science & Technology >Inertization of Heavy Metals Present in Galvanic Sludge by DC Thermal Plasma
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Inertization of Heavy Metals Present in Galvanic Sludge by DC Thermal Plasma

机译：直流热等离子体对电镀污泥中存在的重金属进行惰性化

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摘要

Galvanic sludge results from the treatment of effluents generated by the industrial metal surface treatment of industrial material, which consists in the deposition of a metal on a surface or a metal surface attack, for example, electrodeposition of conductors (metals) and non conductive, phosphate, anodizing, oxidation and/or printed circuit. The treatment proposed here is exposure of the galvanic sludge to the high temperatures provided by thermal plasma, a process which aims to vitrify the galvanic sludge and render metals (iron, zinc, and chromium) inert. Two different plasma reactors were assembled: with a DC transferred arc plasma torch and with a DC nontransferred arc plasma torch. In this way it was possible to verify which reactor was more efficient in the inertization of the metals and also to investigate whether the addition of quartzite sand to the sludge influences the vitrification of the material. Quantification of water content and density of the galvanic raw sludge were performed, as well as analyzes of total organic carbon (TOC) and identify the elements that make up the raw sludge through spectroscopy X-ray fluorescence (XRF). The chemical composition and the form of the pyrolyzed and vitrified sludge were analyzed by scanning electron microscopy with energy-dispersive X-ray spectrometer (SEM-EDS) analysis, which it is a analysis that shows the chemical of the sample surface. The inertization of the sludge was verified in leaching tests, where the leachate was analyzed by flame atomic absorption spectroscopy (FAAS). The results of water content and density were 64.35% and 2.994 g.cm~(-3), respectively. The TOC analysis determined 1.73% of C in the sample of galvanic raw sludge, and XRF analysis determined the most stable elements in the sample, and showed the highest peaks (higher stability) were Fe, Zn, and Cr. The efficiency of the sludge inertization was 100% for chromium, 99% for zinc, and 100% for iron. The results also showed that the most efficient reactor was that with the DC transferred arc plasma torch and quartzite sand positively influenced by the vitrification during the pyrolysis of the galvanic sludge.
机译：电镀污泥是由工业材料的工业金属表面处理产生的废水处理产生的，废水的处理包括金属在表面上的沉积或金属表面的侵蚀，例如，电沉积导体（金属）和不导电的磷酸盐，阳极氧化，氧化和/或印刷电路。此处提出的处理方法是将电沉积污泥暴露于热等离子体提供的高温下，该过程旨在使电沉积污泥玻璃化并使金属（铁，锌和铬）呈惰性。组装了两个不同的等离子体反应器：具有直流转移电弧等离子体炬和直流非转移电弧等离子体炬。通过这种方式，可以验证哪个反应器在金属的惰性化方面更有效，还可以研究向污泥中添加石英岩砂是否会影响材料的玻璃化。进行了电原污泥的水含量和密度的定量分析，以及总有机碳（TOC）的分析，并通过光谱X射线荧光（XRF）鉴定了构成原污泥的元素。通过能量色散X射线光谱仪（SEM-EDS）分析的扫描电子显微镜分析热解和玻璃化污泥的化学组成和形式，该分析是显示样品表面化学性质的分析。在浸出测试中验证了污泥的惰性化，在浸出测试中通过火焰原子吸收光谱法（FAAS）分析了渗滤液。水分含量和密度的结果分别为64.35％和2.994 g.cm〜（-3）。 TOC分析确定了原污泥样品中C的1.73％，XRF分析确定了样品中最稳定的元素，并显示了最高的峰（更高的稳定性）为Fe，Zn和Cr。铬的污泥惰性化效率为100％，锌为99％，铁为100％。结果还表明，最有效的反应器是直流电转移电弧等离子炬和石英岩砂受到电化污泥热解过程中的玻璃化作用的正影响。

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  • 来源
    《Environmental Science & Technology》 |2014年第5期|2853-2861|共9页
  • 作者

    Anelise Leal Vieira Cubas; Marilia de Medeiros Machado; Marina de Medeiros Machado; Frederico Gross; Rachel Faverzani Magnago; Elisa Helena Siegel Moecke; Ivan Goncalvez de Souza;

  • 作者单位

    Environmental Engineering, Universidade do Sul de Santa Catarina (Unisul), Palhoca, Santa Catarina, Brasil;

    Environmental Engineering, Universidade do Sul de Santa Catarina (Unisul), Palhoca, Santa Catarina, Brasil;

    Environmental Engineering, Universidade do Sul de Santa Catarina (Unisul), Palhoca, Santa Catarina, Brasil;

    Environmental Engineering, Universidade do Sul de Santa Catarina (Unisul), Palhoca, Santa Catarina, Brasil;

    Environmental Engineering, Universidade do Sul de Santa Catarina (Unisul), Palhoca, Santa Catarina, Brasil;

    Environmental Engineering, Universidade do Sul de Santa Catarina (Unisul), Palhoca, Santa Catarina, Brasil;

    Department of Chemistry, Universidade Federal de Santa Catarina (UFSC), Florianopolis, Santa Catarina, Brasil;

  • 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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