Removal of Hg, As in FGD gypsum by different aqueous ammonia (amines) during CO2 sequestration

Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA
Tan WenyiZhu Yunkun

Abstract

CO2 sequestration by flue gas desulfurization gypsum (FGDG) has become a promising FGDG disposal technology due to simultaneous CO2 emission reduction and FGDG conversion into calcium carbonate. In this paper, another merit of the novel technology, i.e., the removal of toxic elements (e.g., Hg and As) in FGDG, will be addressed for the first time. In three different aqueous ammonia (or amines) media, removal efficiencies of Hg and As in FGDG samples were evaluated during CO2 sequestration. Higher than 90% and 20% removal efficiencies, respectively, for Hg and As are achieved at 40°C in aqueous ammonia media, but they decrease at elevated temperatures. Ammonia loss takes place at 80°C and pH varies greatly with temperatures in aqueous ammonia. This is disadvantageous for the formation of Hg-ammonia complexes and for the yield of carbonates, which are responsible for Hg or As re-adsorption. The sequential chemical extraction method suggests that the speciation changes of Hg are induced by FGDG carbonation, and that unstable Hg speciation in triethanolamine increases at elevated temperatures.

References

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Feb 14, 2014·Journal of Environmental Sciences (China)·Kelin WangWeiping Pan
Feb 15, 2017·Environmental Science and Pollution Research International·Wenyi TanZewen Shen

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