2003 Progress Report: Fundamental Study of the Impact of SCR on Mercury SpeciationEPA Grant Number: R827649C012
Subproject: 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. , Timpe, Ronald C. , Zygarlicke, Christopher J. , Hassett, David J. , Holmes, Michael J. , Miller, Stanley J. , Laudal, Dennis L. , Olson, Edwin S. , Thompson, Jeffrey S. , Heebink, Loreal V. , Ralston, Nicholas V.C. , Mibeck, Blaise , Kong, Lingbu
Institution: University of North Dakota
EPA Project Officer: Chung, Serena
Project Period: October 15, 1999 through October 14, 2004
Project Period Covered by this Report: October 15, 2002 through October 14, 2003
RFA: Center for Air Toxic Metals (CATM) (1998) RFA Text | Recipients Lists
Research Category: Targeted Research
The objective of the research conducted by the Center for Air Toxic Metals (CATM) is 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 goal of CATM is to develop key information on air toxic metal compounds to support development and implementation of pollution prevention and control strategies that will reduce air toxic metal emissions and releases to the environment.
Previous testing conducted by the Energy and Environmental Research Center (EERC) to evaluate the impact of selective catalytic reduction (SCR) on mercury speciation indicated that the impact is coal-specific. This conclusion has been borne out on 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. A full-factorial design was used to evaluate the independent variables, which include the reactor (none, SCR), presence of acid gases (HCl and SO2/SO3), fly ash type, and residenceime. The presence of ammonia depended on the reactor mode.
The results show that the presence of acid gas is the critical factor in determining the level of mercury oxidation. There also is a clear correlation between the presence of acid gas and an SCR reactor on the level of mercury oxidation.
This is one of the research projects funded by the Center. For descriptions of the other research conducted by CATM, see the 2003 Annual Reports for R827649C006, R827649C009 through R827649C011, and R827649C013 through R827649C022.
This project will continue in the next year.
Supplemental Keywords:air, toxic, air quality, control, modeling, database, emissions, environment, hazardous, mercury, metals, pollutants, pollution, sampling, measurement, species, transformations,, RFA, Scientific Discipline, Air, Toxics, Waste, Chemical Engineering, air toxics, Environmental Chemistry, HAPS, Incineration/Combustion, 33/50, Engineering, Chemistry, & Physics, Environmental Engineering, hexavalent chromium, flue gas , mercury , mercury, selective catalytic reduction, coal fired utility boiler , sampling tools, mercury speciation, mercury speciation and sampling, speciation tools, mercury & mercury compounds, Mercury Compounds, flue gas emissions
Progress and Final Reports: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