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Remediation of brownfields contaminated by organic compounds and heavy metals: a bench-scale test of a sulfur/vermiculite sorbent for mercury vapor removal.

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    0533656 - ÚCHP 2021 RIV DE eng J - Journal Article
    Topka, Pavel - Soukup, Karel - Hejtmánek, Vladimír - Hlásenský, I. - Kaštánek, František - Šolcová, Olga
    Remediation of brownfields contaminated by organic compounds and heavy metals: a bench-scale test of a sulfur/vermiculite sorbent for mercury vapor removal.
    Environmental Science and Pollution Research. Roč. 27, č. 33 (2020), s. 42182-42188. ISSN 0944-1344. E-ISSN 1614-7499
    R&D Projects: GA TA ČR TA04020700
    Institutional support: RVO:67985858
    Keywords : brownfield remediation * thermal desorption * vermiculite
    OECD category: Chemical process engineering
    Impact factor: 4.223, year: 2020
    Method of publishing: Limited access

    In this study, we report for the first time a novel type of sorbent that can be used for mercury adsorption from the air-based off-gasses-vermiculite impregnated with alkali polysulfides and thiosulfates. In contrast to other sorbents, vermiculite exhibits superior thermal stability in air and low adsorption capacity for organic vapors. This allows for a more favorable design of the soil remediation unit-direct coupling of thermal desorber with catalytic oxidizer using air as a carrier gas. In the bench-scale test at 180 degrees C, the sulfur/vermiculite sorbent exhibited significantly higher efficiency for the adsorption of mercury vapor from the off-gasses than the commercial sulfur/activated carbon sorbent at its highest operating temperature (120 degrees C). The average mercury concentration in the adsorber off-gas decreased from 1.634 mg/m(3) for the sulfur/activated carbon to 0.008 mg/m(3)achieved with impregnated vermiculite. The total concentration of organic compounds in the soil after thermal desorption was below the detection limit of the employed analytical method.
    Permanent Link: http://hdl.handle.net/11104/0311984

     
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