Rapid testing procedures are desirable for evaluating leaching from secondary materials being considered for beneficial use in construction or disposal. Often, column leaching tests are considered a surrogate for field data, providing a basis to estimate constituent release under field conditions of intermittent infiltration. This dissertation evaluates the use of batch leaching tests providing information as a function of pH and liquid to solid ratio as a basis for estimating constituent leaching under intermittent percolation. Batch testing results are compared to column testing under unsaturated, intermittent flow and continuous saturated flow. Extrapolations from batch testing based on empirical relationships of pH and liquid to solid ratio and the use of geochemical speciation modeling to represent leaching behavior are examined. Uncertainties as a consequence of each extrapolation basis are quantified. Five granular materials with potential for reuse were evaluated: municipal solid waste incinerator bottom ash, coal fly ash, aluminum recycling residue, construction demolition debris, and a synthetic cement mortar. Two of these materials were tested under two different aging conditions. Results showed no significant difference between the continuously saturated and intermittent unsaturated column flow regimes, agreement in most cases between batch and column testing, including cumulative release, and a decrease in constituent release due to carbonation. Geochemical speciation modeling results for three selected materials agree with experimental batch data and may be used for long-term constituent release prediction.
| Identifer | oai:union.ndltd.org:VANDERBILT/oai:VANDERBILTETD:etd-03292006-150417 |
| Date | 07 April 2006 |
| Creators | López Meza, Sarynna |
| Contributors | John C. Ayers, Hans van der Sloot, David S. Kosson, Andrew C. Garrabrants, Florence Sanchez |
| Publisher | VANDERBILT |
| Source Sets | Vanderbilt University Theses |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.library.vanderbilt.edu/available/etd-03292006-150417/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Vanderbilt University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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