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首页> 外文期刊>Waste Management >A new bioleaching strategy for the selective recovery of aluminum from multi-layer beverage cans
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A new bioleaching strategy for the selective recovery of aluminum from multi-layer beverage cans

机译：来自多层饮料罐的选择性恢复新的生物浸入策略

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摘要

Used beverage cans (UBCs) represent one of the largest sources for secondary aluminum production worldwide. Beverage cans are one of the most frequently produced multi-layer packaging materials made of aluminum with an inner epoxy resin coating to prevent direct contact of food and aluminum surface. In the common way of UBCs recycling, the whole can is re-melted, resulting in the burning and loss of the inner epoxy coating. The use of acidophilic bacteria for the biological leaching of metals has already been well studied, but until now their applications for the selective separation of metal-containing multilayer materials has not been investigated. In this study, the three bioleaching bacteria: A. ferrooxidans, A thiooxidans and A. caldus were explored to selectively leach the aluminum from the epoxy layer, resulting in leaching efficiencies of around 92% after three weeks of incubation. Surface characterization of the epoxy layer after bioleaching application revealed that the nature of the epoxy resin was unchanged, which could allow for recycling. The dissolved aluminum was afterwards selectively precipitated from the lixiviants at pH = 6.5, resulting in aluminum hydroxide precipitation efficiencies of almost 100%. The high leaching efficiencies and the selective precipitation shows the significant potential of acidophilic bacteria in the separation and recycling of multi-layer materials.
机译：二手饮料罐（UBCS）代表全球最大的二级铝生产源之一。饮料罐是由铝制成具有内环氧树脂涂层的最常见的多层包装材料之一，以防止食品和铝表面的直接接触。以UBCS再循环的常见方式，整体可以重新熔化，导致内环氧涂层的燃烧和损失。已经很好地研究了用于金属的生物浸出的嗜酸性细菌，但直到现在，它们对含金属的多层材料的选择性分离的应用尚未研究。在这项研究中，探索了三种生物浸润的细菌：A.Froioxidans，硫代辛甘油和A. Caldus选择性地从环氧树脂层中浸出铝，导致孵化三周后浸出效率约为92％。生物浸出施用后环氧树脂层的表面表征显示，环氧树脂的性质不变，这可能允许回收。之后，溶解的铝在pH = 6.5的液体中选择性地沉淀出来，导致氢氧化铝沉淀效率近100％。高浸出效率和选择性沉淀表明，嗜酸性细菌在多层材料的分离和再循环中的显着潜力。

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  • 来源
    《Waste Management》 |2021年第2期|16-24|共9页
  • 作者

    Klemens Kremser; Patrick Gerl; Alessandro Pellis; Georg M. Guebitz;

  • 作者单位

    University of Natural Resources and Life Sciences Vienna BOKU Dept. of Agrobiotechnology IFA-Tulln Inst. of Environmental Biotechnology Konrad-Lorenz-Strasse 20 3430 Tulln and der Donau Austria;

    University of Natural Resources and Life Sciences Vienna BOKU Dept. of Agrobiotechnology IFA-Tulln Inst. of Environmental Biotechnology Konrad-Lorenz-Strasse 20 3430 Tulln and der Donau Austria;

    University of Natural Resources and Life Sciences Vienna BOKU Dept. of Agrobiotechnology IFA-Tulln Inst. of Environmental Biotechnology Konrad-Lorenz-Strasse 20 3430 Tulln and der Donau Austria;

    University of Natural Resources and Life Sciences Vienna BOKU Dept. of Agrobiotechnology IFA-Tulln Inst. of Environmental Biotechnology Konrad-Lorenz-Strasse 20 3430 Tulln and der Donau Austria;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Used beverage cans; Bioleaching; Selective aluminum recovery; Multi-layer materials;

    机译：用过的饮料罐;生物浸渍;选择性铝恢复;多层材料;

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