EPA Science Inventory

Investigation Of A Mercury Speciation Technique For Flue Gas Desulfurization Materials

Citation:

Lee, J., K. Cho, L. Cheng, T. C. Keener, G. Jegadeesan, AND S. R. AL-ABED. Investigation Of A Mercury Speciation Technique For Flue Gas Desulfurization Materials. T. Keener and G. Hidy (ed.), JOURNAL OF AIR AND WASTE MANAGEMENT. Air & Waste Management Association, Pittsburgh, PA, 59(8):972-979, (2009).

Description:

Most of the synthetic gypsum generated from wet flue gas desulfurization (FGD) scrubbers is currently being used for wallboard production. Because oxidized mercury is readily captured by the wet FGD scrubber, and coal-fired power plants equipped with wet scrubbers desire to benefit from the partial mercury control that these systems provide, some mercury is likely to be bound in with the FGD gypsum and wallboard. In this study, the feasibility of identifying mercury species in the FGD gypsum and wallboard samples was investigated using a large sample size thermal desorption method. Potential candidates of pure mercury standards including mercuric chloride (HgCl2), mercurous chloride (Hg2Cl2), mercury oxide (HgO), mercury sulfide (HgS), and mercuric sulfate (HgSO4) were analyzed to compare their results with those obtained from FGD gypsum and dry wallboard samples. Although any of the thermal evolutionary curves obtained from these pure mercury standards did not exactly match with those of the FGD gypsum and wallboard samples, it was identified that Hg2Cl2 and HgCl2 could be candidates. An additional chlorine analysis from the gypsum and wallboard samples indicated that the chlorine concentrations were approximately 2 orders of magnitude higher than the mercury concentrations, suggesting possible chlorine association with mercury.

Purpose/Objective:

To investigate the feasibility of identifying mercury species in the FGD gypsum and wallboard samples, using a large sample size thermal desorption method.

URLs/Downloads:

Preview.aspx   Exit

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Projected Completion Date: 08/01/2009
Record Last Revised: 08/04/2009
Record Created: 06/08/2009
Record Released: 06/08/2009
OMB Category: Other
Record ID: 209966

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

LAND REMEDIATION AND POLLUTION CONTROL DIVISION

WASTE MANAGEMENT BRANCH