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| Title: | Modeling arsenic (V) adsorption by fly ash using a speciation-based adsorption model |
| Author (s): | Wang, T. Wang, J. Burken, Joel G. Ban, H. Ladwig, K. |
| Department/Lab Affiliations: | Civil, Architectural & Environmental Engineering Environmental Research Center |
| Keywords: | pH subbituminous coal fly |
| Subject Terms: | Fly ash. Hydrogen-ion concentration. Selenium. |
| Issue Date: | 2007 |
| Publisher: | American Society of Agronomy |
| Citation: | Wang, T., Chusuei , C., Burken, J.G., Ban, H., and Ladwig, K. (2007) Modeling Arsenic (V) Adsorption by Fly Ash using a Speciation-Based Adsorption Model, Journal of Environmental Quality, 36, 1784-1792. |
| Abstract: | Received for publication March 22, 2007. The leaching characteristics of selenium from several bituminous and subbituminous coal fly ashes under different pH conditions were investigated using batch methods. Results indicated that pH had a significant effect on selenium leaching from bituminous coal ash. The minimum selenium leaching occurred in the pH range between 3 and 4, while the maximum selenium leaching occurred at pH 12. The release of selenium from subbituminous coal ashes was very low for the entire experimental pH range, possibly due to the high content of calcium which can form hydration or precipitation products as a sink for selenium. The adsorption results for different selenium species indicated that Se(VI) was hardly adsorbable on either bituminous coal ashes or subbituminous coal ashes at any pH. However, Se(IV) was highly adsorbed by bituminous coal ashes under acidic pH conditions and was mostly removed by subbituminous coal ashes across the entire pH range. This result suggests that the majority of selenium released from the tested fly ashes was Se(IV). A speciation-based model was developed to simulate the adsorption of Se(IV) on bituminous coal fly ash, and the pH-independent adsorption constants of HSeO3– and SeO32– were determined. The modeling approach is useful for understanding and predicting the release process of selenium from fly ash. |
| Type: | Article - Journal text |
| In Title: | Journal of Environmental Quality |
| 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. FULL COPYRIGHT INFORMATION: |
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| title | Modeling arsenic (V) adsorption by fly ash using a speciation-based adsorption model |
| contributor.author | Wang, T. |
| contributor.author | Wang, J. |
| contributor.author | Burken, Joel G. |
| contributor.author | Ban, H. |
| contributor.author | Ladwig, K. |
| contributor.deptlab | Civil, Architectural & Environmental Engineering |
| contributor.deptlab | Environmental Research Center |
| subject | pH |
| subject | subbituminous coal fly |
| subject.LCSH | Fly ash. |
| subject.LCSH | Hydrogen-ion concentration. |
| subject.LCSH | Selenium. |
| date.issued | 2007 |
| publisher | American Society of Agronomy |
| identifier.citation | Wang, T., Chusuei , C., Burken, J.G., Ban, H., and Ladwig, K. (2007) Modeling Arsenic (V) Adsorption by Fly Ash using a Speciation-Based Adsorption Model, Journal of Environmental Quality, 36, 1784-1792. |
| identifier.pub.URI | |
| description.abstract | Received for publication March 22, 2007. The leaching characteristics of selenium from several bituminous and subbituminous coal fly ashes under different pH conditions were investigated using batch methods. Results indicated that pH had a significant effect on selenium leaching from bituminous coal ash. The minimum selenium leaching occurred in the pH range between 3 and 4, while the maximum selenium leaching occurred at pH 12. The release of selenium from subbituminous coal ashes was very low for the entire experimental pH range, possibly due to the high content of calcium which can form hydration or precipitation products as a sink for selenium. The adsorption results for different selenium species indicated that Se(VI) was hardly adsorbable on either bituminous coal ashes or subbituminous coal ashes at any pH. However, Se(IV) was highly adsorbed by bituminous coal ashes under acidic pH conditions and was mostly removed by subbituminous coal ashes across the entire pH range. This result suggests that the majority of selenium released from the tested fly ashes was Se(IV). A speciation-based model was developed to simulate the adsorption of Se(IV) on bituminous coal fly ash, and the pH-independent adsorption constants of HSeO3– and SeO32– were determined. The modeling approach is useful for understanding and predicting the release process of selenium from fly ash. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Postprint |
| 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.URI | |
| relation.isPartOf | Journal of Environmental Quality |
| date.accessioned | 2007-04-11T17:00:48Z |
| date.available | 2008-04-14T20:26:54Z |
| identifier.persist.URI |