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首页> 外文会议>International Symposium on Supercritical Fluids Tome 1: Natural Products, Process amp; Equipment Development; 20030428-20030430; Versailles; FR >FLY ASH OF MUNICIPAL WASTE INCINERATOR: LEACHABILITY OF METALS AFTER SFE WITH CO_2
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FLY ASH OF MUNICIPAL WASTE INCINERATOR: LEACHABILITY OF METALS AFTER SFE WITH CO_2

机译：市政垃圾焚烧炉的粉煤灰：CO_2进行SFE后金属的可浸出性

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Aiming the removal of metal contamination of chemical solid waste or harbour sludge, supercritical fluid extraction from fly ash is a successful example, Large quantities of heavy metal contaminated fly ash are generated due to the growing amount of municipal solid waste and its incineration. Currently, expensive deposition of the ash is required because contact with (rain) water leads to leaching of these metals and subsequently to pollution of ground water, One way to reduce the leachability of the ashes is supercritical fluid extraction (SFE) with CO_2 and extractants. The extractants, such as e.g. (Bis(2,4,4-trimethylpentyl)monothio-phosphinic acid (Cyanex 302), Tributylphosphate (TBP), Di-(2-ethylhexyI)phosphoric acid (D_2EHPA) are dissolved in CO_2 and form CO_2-soluble metal-complexes. Extraction was carried out at in a rotating vessel of about 12 1 volume at 16 MPa and with a constant CO_2-flow, Afterwards, the metal leachability of the extracted ash was studied with standardised column leaching tests. The resulting cumulative leaching curves showed a better leachability reduction of Mn in particular when the CO_2 extraction efficiency was better. The leachability of metals such as e.g. Pb and Mo, initially above the legislative leaching limit, was reduced significantly while Pb was reduced below this limit. Despite a dramatic leachability increase of some metals (such as e.g. Sb) SFE and a combination of treatment steps have a potential to reduce the leachability below legislative values allowing even re-use of fly ash as construction material.
机译：为了去除化学固体废物或港口污泥中的金属污染，从飞灰中提取超临界流体是一个成功的例子。由于城市固体废物及其焚化的增加，产生了大量重金属污染的飞灰。当前，需要昂贵的灰分沉积，因为与（雨水）接触会导致这些金属的浸出，进而污染地下水。降低灰烬浸出性的一种方法是使用CO_2和萃取剂进行超临界流体萃取（SFE） 。提取剂，例如（双（2,4,4-三甲基戊基）一硫代次膦酸（Cyanex 302），磷酸三丁酯（TBP），二（2-乙基己基）磷酸（D_2EHPA）溶解在CO_2中并形成可溶于CO_2的金属络合物。在约12 1体积的旋转容器中以16 MPa的压力和恒定的CO_2流量进行萃取，然后，通过标准化的柱浸试验研究萃取的灰分的金属浸出性，所得的累积浸出曲线显示出更好的浸出性能。 Mn的浸出率降低，尤其是当CO_2的萃取效率更高时，金属（如Pb和Mo）的浸出率最初超过了法定的浸出极限，而Pb的浸出率显着降低，低于该极限。金属（例如Sb）SFE和处理步骤的组合有可能将可浸性降低到法律规定值以下，甚至可以将粉煤灰重新用作建筑材料。

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