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Title page for ETD etd-03292006-150417


Type of Document Dissertation
Author López Meza, Sarynna
Author's Email Address sarynna.lopez@vanderbilt.edu
URN etd-03292006-150417
Title Evaluation of the Impact of Environmental Conditions on Constituent Leaching from Granular Materials During Intermittent Infiltration
Degree PhD
Department Environmental Engineering
Advisory Committee
Advisor Name Title
David S. Kosson Committee Chair
Andrew C. Garrabrants Committee Member
Florence Sanchez Committee Member
Hans van der Sloot Committee Member
John C. Ayers Committee Member
Keywords
  • aluminum residue
  • batch experiments
  • column leaching experiments
  • coal fly ash
  • bottom ash
  • carbonation
  • intermittent infiltration
  • concrete
  • granular materials
  • Leaching -- Environmental aspects
  • leaching modeling
  • construction debris
  • Waste products as road materials -- Environmental aspects
Date of Defense 2005-11-04
Availability unrestricted
Abstract
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.
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