Simulation and evaluation of elemental mercury concentration increase in flue gas across a wet scrubber

被引:102
|
作者
Chang, JCS
Ghorishi, SB
机构
[1] US EPA, Natl Risk Management Res Lab, Air Pollut & Prevent Control Div, Res Triangle Pk, NC 27711 USA
[2] ARCADIS G&M Inc, Durham, NC 27713 USA
关键词
D O I
10.1021/es034352s
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Experimental data from a laboratory-scale wet scrubber simulator confirmed that oxidized mercury, Hg2+, can be reduced by aqueous S(IV) (sulfite and/or bisulfite) species and results in elemental mercury (Hg-0) emissions under typical wet FGD scrubber conditions. The S(IV)-induced Hg2+ reduction and Hg-0 emission mechanism can be described by a model which assumes that only a fraction of the Hg2+ can be reduced, and the rate-controlling step of the overall process is a first-order reaction involving the Hg-S(IV) complexes. Experimental data and model simulations predict that the Hg2+ in the flue gas can cause rapid increase of Hg-0 concentration in the flue gas across a FGD scrubber. Forced oxidation can enhance Hg2+ reduction and Hg-0 emission by decreasing the S(N) concentration in the scrubbing liquor. The model predictions also indicate that flue gas Hg-0 increase across a wet FGD scrubber can be reduced by decreasing the pH, increasing S(IV) concentration, and lowering the temperature.
引用
收藏
页码:5763 / 5766
页数:4
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