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Final Report: Fundamental Study of the Impact of SCR on Mercury Speciation
EPA Grant Number: R827649C012Subproject: this is subproject number 012 , established and managed by the Center Director under grant R827649
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
Center: Center for Air Toxic Metals® (CATM®)
Center Director: Groenewold, Gerald
Title: Fundamental Study of the Impact of SCR on Mercury Speciation
Investigators: Pavlish, John H. , Benson, Steven A. , Galbreath, Kevin C. , Hassett, David J. , Heebink, Loreal V. , Holmes, Michael J. , Kong, Lingbu , Laudal, Dennis L. , Mibeck, Blaise , Miller, Stanley J. , Olson, Edwin S. , Ralston, Nicholas V.C. , Thompson, Jeffrey S. , Timpe, Ronald C. , Zygarlicke, Christopher J.
Institution: University of North Dakota
EPA Project Officer: Stelz, Bill
Project Period: October 15, 1999 through October 14, 2004
RFA: Center for Air Toxic Metals (CATM) (1998)
Research Category: Targeted Research
Description:
Objective:The objective of this research project was to address air toxic trace element emissions, which have become a matter of worldwide concern as well as a regulatory issue in the United States. The specific objective of this research project was to develop and disseminate critical information on air toxic metal compounds to support development and implementation of pollution prevention and control strategies that will reduce effectively air toxic metal emissions and releases to the environment.
Summary/Accomplishments (Outputs/Outcomes):Previous testing conducted by the Energy & Environmental Research Center (EERC) to evaluate the impact of selective catalytic reduction (SCR) on mercury speciation indicated that the impact is coal-specific. This result has been seen in numerous projects. To investigate the role that SO2/SO3 and HCl/Cl2 concentrations in the coal play, bench-scale tests using a fixed-bed system were conducted to help determine the effects of these gases. Tests also included 4 weeks of pilot-scale testing and full-scale sampling at six different power plants. The results show that acid gases are the most critical factor affecting the level of mercury oxidation across the SCR. SO2, SO3, HCl, NO, and NO2 all were determined to play a statistically significant role in promoting mercury oxidation. It appears that SCR catalysts will oxidize mercury when installed at plants burning high-chlorine eastern bituminous coals. Based on only a few data points, it appears that SCR catalysts will not oxidize mercury when installed at plants burning low-chlorine western lignite and subbituminous coal.
Supplemental Keywords:air, air quality, analysis, control, emissions, environment, hazardous, measurement, mercury, metals, modeling, pollutants, pollution, sampling, species, toxic, transformations,
,
Toxics, Air, Scientific Discipline, Waste, RFA, Engineering, Chemistry, & Physics, Chemical Engineering, HAPS, Incineration/Combustion, air toxics, Environmental Engineering, Environmental Chemistry, 33/50, flue gases, speciation tools, mercury & mercury compounds, flue gas emissions, coal fired utility boiler , mercury , mercury, mercury speciation, selective catalytic reduction, sampling tools, mercury speciation and sampling, flue gas , Mercury Compounds
Relevant Websites:
http://www.undeerc.org 
http://www.undeerc.org/catm/index.html
Progress and Final Reports:
2003 Progress Report
Original Abstract
Main Center Abstract and Reports:
R827649 Center for Air Toxic Metals® (CATM®)
Subprojects under this Center:
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R827649C001 Development And Demonstration Of Trace Metals Database
R827649C002 Nickel Speciation Of Residual Oil Ash
R827649C003 Atmospheric Deposition: Air Toxics At Lake Superior
R827649C004 Novel Approaches For Prevention And Control For Trace Metals
R827649C005 Wet Scrubber System
R827649C006 Technology Commercialization And Education
R827649C007 Development Of Speciation And Sampling Tools For Mercury In Flue Gas
R827649C008 Process Impacts On Trace Element Speciation
R827649C009 Mercury Transformations in Coal Combustion Flue Gas
R827649C010 Nickel, Chromium, and Arsenic Speciation of Ambient Particulate Matter in the Vicinity of an Oil-Fired Utility Boiler
R827649C011 Transition Metal Speciation of Fossil Fuel Combustion Flue Gases
R827649C012 Fundamental Study of the Impact of SCR on Mercury Speciation
R827649C013 Development of Mercury Sampling and Analytical Techniques
R827649C014 Longer-Term Testing of Continuous Mercury Monitors
R827649C015 Long-Term Mercury Monitoring at North Dakota Power Plants
R827649C016 Development of a Laser Absorption Continuous Mercury Monitor
R827649C017 Development of Mercury Control Technologies
R827649C018 Developing SCR Technology Options for Mercury Oxidation in Western Fuels
R827649C019 Modeling Mercury Speciation in Coal Combustion Systems
R827649C020 Stability of Mercury in Coal Combustion By-Products and Sorbents
R827649C021 Mercury in Alternative Fuels
R827649C022 Studies of Mercury Metabolism and Selenium Physiology