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Stability of mercury on a novel mineral sulfide sorbent used for efficient mercury removal from coal combustion flue gas

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Abstract

Nano-structured zinc sulfide (Nano-ZnS) has been demonstrated to be a promising alternative to activated carbon (AC) for controlling mercury emission from coal combustion flue gas. The ultimate fate of the mercury-laden Nano-ZnS after mercury capture is mostly disposed in landfill with fly ashes. Thus, the stability of mercury adsorbed on the Nano-ZnS is of considerable significance in the secured disposal of fly ash after mercury removal and in the commercial application of the Nano-ZnS sorbent for removal of mercury from coal combustion flue gas. In this work, a modified toxicity characteristic leaching procedure (TCLP) was conducted to evaluate the leachability of mercury on the Nano-ZnS. The effects of leachate pH value, leaching time, liquid-to-solid ratio, and acid rain types on mercury leaching from the mercury-laden Nano-ZnS were systematically investigated. The TCLP results show that the concentration of mercury in leachate was far below the safe limit (200 μg/L) as imposed by the US Environmental Protection Agency (EPA) for classifying a material as a hazardous waste. All the key parameters that generally affected metal leaching rate exhibited slight effect on mercury leaching from the mercury-laden Nano-ZnS. Leaching tests at various highly severe conditions resulted in less than 0.01% mercury leaching from the mercury-laden Nano-ZnS. Sequential selective extraction tests demonstrated that mercury sulfide (HgS) was the dominant adsorption product on the Nano-ZnS, which guaranteed the excellent stability of mercury adsorbed on the Nano-ZnS.

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Funding

This project was supported by the National Natural Science Foundation of China (No. 51476189, 51776227) and the Natural Science Foundation of Hunan Province, China (2018JJ1039, 2018JJ3675).

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Authors and Affiliations

  1. School of Energy Science and Engineering, Central South University, Changsha, 410083, China

    Hailong Li, Mingguang Zhang, Lei Zhu & Jianping Yang

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  1. Hailong Li
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  2. Mingguang Zhang
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  3. Lei Zhu
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  4. Jianping Yang
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Correspondence to Jianping Yang.

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Responsible editor: Tito Roberto Cadaval Jr

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Li, H., Zhang, M., Zhu, L. et al. Stability of mercury on a novel mineral sulfide sorbent used for efficient mercury removal from coal combustion flue gas. Environ Sci Pollut Res 25, 28583–28593 (2018). https://doi.org/10.1007/s11356-018-2896-z

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