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Arsenic Leaching From Spent Adsorbents Under Landfill Conditions

Yi, Mengling
http://rave.ohiolink.edu/etdc/view?acc_num=osu1250178204

Abstract Details

2009, Master of Science, Ohio State University, Environmental Science.
Implementation of the new arsenic MCL in 2006 will lead to the generation of an estimated 10,000 tons of arsenic bearing solid residuals (ABSRs) every year. The regulatory protocols, such as TCLP and California Waste Extraction Test, which are used to determine the legal disposal of ABSRs into a municipal solid waste landfill, have been demonstrated significantly misrepresent arsenic mobilization in landfills. Mechanisms responsible for arsenic leaching from spent adsorbents under landfill conditions are not known with certainty but are of crucial importance as it is likely that these adsorbent media will be used and subsequently discarded as residents and utilities treat As-contaminated source waters to meet regulations. This study is one of the few studies investigating As leaching potential of spent media compromised of Bayoxide E33 from long-term arsenic removal operations subjected to different leaching tests, including ones with landfill leachate. Detailed factors of As release mechanisms in both macroscopic aspect, such as physical leaching conditions and in microscopic aspect, such as complexation configurations between As and iron oxide media, chemical component configurations in the leachate were studied comprehensively. The focus on source water chemistry and treatment process revealed the significance of considering the initial As loading as a factor for As release. Chemical configuration of leachate becomes another significant factor that influence As release. Landfill leachate may vary vastly from site to site, but the one with high pH, high concentrations of TOC that promotes mineral dissolution and competes directly with As on the mineral surface as well as high concentrations of phosphate and bicarbonate will contribute more to As release. X-ray adsorption fine structure (XAFS) spectroscopy studies showed binuclear bidentate complexes of As(V) dominated in both pre-leaching and post-leaching samples and few shifts from strongly bounded complexes to less stable ones were found to be associated with water treatment processes and with high pH and reduced leaching conditions.
John Lenhart (Advisor)
Harold Walker (Committee Member)
Basta Nicholas (Committee Member)
Linda Weavers (Committee Member)
169 p.
arsenic; leaching; landfill

Recommended Citations

Citations

  • Yi, M. (2009). Arsenic Leaching From Spent Adsorbents Under Landfill Conditions [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250178204

    APA Style (7th edition)

  • Yi, Mengling. Arsenic Leaching From Spent Adsorbents Under Landfill Conditions. 2009. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1250178204.

    MLA Style (8th edition)

  • Yi, Mengling. "Arsenic Leaching From Spent Adsorbents Under Landfill Conditions." Master's thesis, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250178204

    Chicago Manual of Style (17th edition)

osu1250178204
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© 2009, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.