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PRACTICAL APPLICATIONS FROM OBSERVATIONS OF MERCURY OXIDATION AND BINDING MECHANISMS
Citation:
Hutson*, N, C. Singer, C. Richardson, J. Karwowski, AND C B. Sedman*. PRACTICAL APPLICATIONS FROM OBSERVATIONS OF MERCURY OXIDATION AND BINDING MECHANISMS. Presented at Combined Power Plant Air Pollutant Control Mega Symposium, Washington, DC, August 30 - September 02, 2004.
Impact/Purpose:
To inform the public.
Description:
This paper describes a bench-scale program at the U.S. EPA. The goals of this program are to (a) isolate individual mechanisms of elemental mercury oxidation and oxidized mercury capture, (b) compete these mechanisms over a broad temperature range to determine which are dominant in those temperature ranges, (c) vary fly ash parameters (carbon and calcium) to promote or inhibit these surface mechanisms and (d) vary concentrations of the flue gas acid species, including surfuric acid to determine the optimum for driving these reactions. Preliminary results suggest that at 120 degrees C, hydrochloric acid appers to be the more important oxidant and binding agent, but in the absence of HCl, surfur trioxide becomes important in mercury oxidation.