Abstract
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 °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 °C). The average mercury concentration in the adsorber off-gas decreased from 1.634 mg/m3 for the sulfur/activated carbon to 0.008 mg/m3 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.
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The financial support of the Technology Agency of the Czech Republic (project No. TA04020700) is gratefully acknowledged.
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Responsible Editor: Tito Roberto Cadaval Jr
Paper dedicated to Professor František Kaštánek on the occasion of his 85th birthday
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Topka, P., Soukup, K., Hejtmánek, V. et al. Remediation of brownfields contaminated by organic compounds and heavy metals: a bench-scale test of a sulfur/vermiculite sorbent for mercury vapor removal. Environ Sci Pollut Res 27, 42182–42188 (2020). https://doi.org/10.1007/s11356-020-10696-1
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DOI: https://doi.org/10.1007/s11356-020-10696-1