Comparison between Acetic Acid and Landfill Leachates for the Leaching of Pb(II), Cd(II), As(V), and Cr(VI) from Cementitious Wastes

The Toxicity Characteristic Leaching Procedure (TCLP) has been widely used to characterize the suitability of solid wastes for disposal in landfills. However, the widespread application of this test for the assessment of wastes disposed in different landfill types is often questionable. This paper i...

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Bibliographic Details
Published in:Environmental science & technology 2004-07, Vol.38 (14), p.3977-3983
Main Authors: Halim, Cheryl E, Scott, Jason A, Natawardaya, Helena, Amal, Rose, Beydoun, Donia, Low, Gary
Format: Article
Language:English
Subjects:
Acetic Acid - chemistry
Analysis methods
Applied sciences
Arsenates - analysis
Australia
Cadmium Compounds - analysis
Carbonates - chemistry
Chromates - analysis
Environmental Monitoring
Exact sciences and technology
Hydrogen-Ion Concentration
Lead - analysis
Models, Chemical
Nitrates - analysis
Pollution
Refuse Disposal
Sodium Compounds - analysis
Soil Pollutants - analysis
Solubility
Wastes
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Summary:The Toxicity Characteristic Leaching Procedure (TCLP) has been widely used to characterize the suitability of solid wastes for disposal in landfills. However, the widespread application of this test for the assessment of wastes disposed in different landfill types is often questionable. This paper investigates the leaching profiles of cement-stabilized heavy metal ions, namely, Pb (II), Cd (II), As(V), and Cr(VI), using acetic acid and leachates from municipal and nonputrescible Australian landfill sites. The leaching profiles of Pb, Cd, As, and Cr using acetic acid were found to be similar to the nonputrescible landfill leachate and differed markedly from the municipal solid waste (MSW) leachate. The additional presence of high amounts of organic and inorganic compounds in the municipal landfill leachate influenced the leaching profiles of these metal ions as compared to the acetic acid and the nonputrescible systems. It is postulated that the organic compounds present in the municipal landfill leachate formed complexes with the Pb and Cd, increasing the mobility of these ions. Moreover, the organic compounds in the municipal landfill leachate induced a reducing environment in the leachate, causing the reduction of Cr(VI) to Cr(III). It was also found that the presence of carbonates in the municipal landfill leachate affected the stability of calcium arsenate, with the carbonate competing with arsenate for calcium at high pH, forcing arsenate into the solution.
ISSN:0013-936X
1520-5851
DOI:10.1021/es0350740