Control of Hg⁰ Re-Emission from Simulated Wet Flue Gas Desulfurization Liquors by Sodium Dithiocarbamate

Abstract:

Secondary atmospheric pollutions may result from wet flue gas desulfurization (WFGD) systems caused by the reduction of Hg²⁺ to Hg⁰ and lead to a damping of the co-benefit mercury removal efficiency by WFGD systems. The effects of the operating conditions, which included the pH, temperature, and oxygen concentrations, on Hg⁰ re-emission inhibition efficiency by DTCR from WFGD liquors was carried out. The established data reflected an outstanding performance on the Hg⁰ re-emission inhibition from the simulated WFGD liquors by adding DTCR. Our data suggested that a concentration of 0.0005% (v/v) was enough for Hg⁰ re-emission inhibition in the simulated WFGD liquors. The results also indicated that the Hg⁰ re-emission inhibition efficiency by adding DTCR decreased as the operational temperatures increased and the Hg⁰ re-emission inhibition efficiency increased as pH values and the oxygen concentration in the flue gas increased. The present findings could be valuable for industrial application of DTCR as a precipitant for stabilizing dissolved Hg²⁺ to prevent re-emission of Hg⁰ in WFGD solutions.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 1473-1477
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.1473
• Online since: December 2012
• Authors: Chuan Min Chen, Li Xing Jiang, Song Tao Liu, Yu Ze Jiang
• Keywords: DTCR, Hg²⁺ Reduction, Re-Emission Inhibition, Wet Flue Gas Desulfurization

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