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| Title: | Leaching characteristics of arsenic and selenium from coal fly ash: role of calcium |
| Author (s): | Wang, Tian Wang, Jianmin Tang, Yulin Shi, Honglan Ladwig, Ken |
| Department/Lab Affiliations: | Civil, Architectural & Environmental Engineering Environmental Research Center University Transportation Center |
| Keywords: | coal fly ash leaching behavior |
| Subject Terms: | Selenium. |
| Issue Date: | 2009-05 |
| Publisher: | American Chemical Society ACS |
| Citation: | Wang, Tian, Jianmin Wang, Yulin Tang, Honglan Shi, and Ken Ladwig. “Leaching Characteristics of Arsenic and Selenium from Coal Fly Ash: Role of Calcium”, Energy and Fuels, Vol. 23, No. 6 (2009): 2959-2966. |
| Abstract: | Understanding the leaching behavior of arsenic (As) and selenium (Se) in coal fly ash is important in evaluating the potential environmental impact of coal fly ash. Batch experiments were employed to systematically investigate the leaching behavior of As and Se in two major types of coal fly ashes, bituminous coal ash and sub-bituminous coal ash, and to determine the underlying processes that control As and Se leaching. The effects of pH, solid/liquid (S/L) ratio, calcium addition, and leaching time on the release of As and Se were studied. Overall, bituminous coal ash leached significantly more As and Se than sub-bituminous coal ash, and Se was more readily leachable, in both absolute concentration and relative fraction, than As for both types of fly ashes. Adsorption/desorption played a major role on As and Se leaching from bituminous coal ashes. However, calcium precipitation played the most important role in reducing As and Se leaching from sub-bituminous coal ashes in the entire experimental pH range. The leaching of As and Se from bituminous coal ashes generally increased with increases in the S/L ratio and leaching time. However, for sub-bituminous coal ashes, the leaching of As was not detected under most experimental conditions, while the leaching of Se increased with increases in the S/L ratio and leaching time. AsV and SeIV were found to be the major species in all ash leachates in this study. |
| Type: | Article - Journal text |
| In Title: | Energy and Fuels |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. Pre-print: author cannot archive; Post-print: author cannot archive; FULL COPYRIGHT INFORMATION: |
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| title | Leaching characteristics of arsenic and selenium from coal fly ash: role of calcium |
| contributor.author | Wang, Tian |
| contributor.author | Wang, Jianmin |
| contributor.author | Tang, Yulin |
| contributor.author | Shi, Honglan |
| contributor.author | Ladwig, Ken |
| contributor.deptlab | Civil, Architectural & Environmental Engineering |
| contributor.deptlab | Environmental Research Center |
| contributor.deptlab | University Transportation Center |
| contributor.sponsor | Electric Power Research Institution |
| contributor.sponsor | United States Department of Transportation |
| subject | coal fly ash |
| subject | leaching behavior |
| subject.LCC | Arsenic. |
| subject.LCSH | Selenium. |
| date.issued | 2009-05 |
| publisher | American Chemical Society ACS |
| identifier.citation | Wang, Tian, Jianmin Wang, Yulin Tang, Honglan Shi, and Ken Ladwig. “Leaching Characteristics of Arsenic and Selenium from Coal Fly Ash: Role of Calcium”, Energy and Fuels, Vol. 23, No. 6 (2009): 2959-2966. |
| identifier.pub.URI | |
| description.abstract | Understanding the leaching behavior of arsenic (As) and selenium (Se) in coal fly ash is important in evaluating the potential environmental impact of coal fly ash. Batch experiments were employed to systematically investigate the leaching behavior of As and Se in two major types of coal fly ashes, bituminous coal ash and sub-bituminous coal ash, and to determine the underlying processes that control As and Se leaching. The effects of pH, solid/liquid (S/L) ratio, calcium addition, and leaching time on the release of As and Se were studied. Overall, bituminous coal ash leached significantly more As and Se than sub-bituminous coal ash, and Se was more readily leachable, in both absolute concentration and relative fraction, than As for both types of fly ashes. Adsorption/desorption played a major role on As and Se leaching from bituminous coal ashes. However, calcium precipitation played the most important role in reducing As and Se leaching from sub-bituminous coal ashes in the entire experimental pH range. The leaching of As and Se from bituminous coal ashes generally increased with increases in the S/L ratio and leaching time. However, for sub-bituminous coal ashes, the leaching of As was not detected under most experimental conditions, while the leaching of Se increased with increases in the S/L ratio and leaching time. AsV and SeIV were found to be the major species in all ash leachates in this study. |
| type | Article - Journal |
| type.DCMIType | text |
| relation.isPartOf | Energy and Fuels |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights | Pre-print: author cannot archive; Post-print: author cannot archive; |
| rights.URI | |
| rights.URI | |
| identifier.persist.URI | |
| date.available | 2009-06-19T13:27:51Z |