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Related Experiment Videos

Lead leachability in stabilized/solidified soil samples evaluated with different leaching tests.

Chuanyong Jing1, Xiaoguang Meng, George P Korfiatis

  • 1Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ 07030, USA. cjing@stevens-tech.edu

Journal of Hazardous Materials
|October 30, 2004
PubMed
Summary
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Stabilization/solidification effectively reduces lead (Pb) in soil leachate. Leachate pH is the primary factor controlling Pb immobilization, with distinct leaching behaviors observed across different pH ranges.

Area of Science:

  • Environmental Science
  • Geochemistry
  • Soil Science

Background:

  • Lead (Pb) contamination in soil poses significant environmental and health risks.
  • Stabilization/solidification (S/S) is a common remediation technique for heavy metal-contaminated soils.
  • Understanding Pb immobilization mechanisms is crucial for effective soil remediation.

Purpose of the Study:

  • To investigate lead (Pb) immobilization mechanisms in soil.
  • To compare the effectiveness of different leaching protocols for assessing Pb leachability.
  • To model Pb leaching behavior using geochemical principles.

Main Methods:

  • Conducted leaching tests using eight different protocols on untreated and S/S treated soil.
  • Analyzed Pb concentrations in the leachate.

Related Experiment Videos

  • Employed the MINTEQA2 program with diffuse layer adsorption, aqueous, and precipitation reactions to model Pb leaching behavior.

    • Main Results:

    • S/S treatment reduced Pb concentrations in TCLP leachate from 5.9 mg/L to <0.7 mg/L.
    • Final leachate pH was identified as the main factor controlling Pb concentration.
    • Pb leachability exhibited three distinct stages based on leachate pH: high alkalinity (>12), neutral to alkaline (6-12), and acid (<6).

    Conclusions:

    • Leachate pH is the dominant factor governing Pb leachability, overriding leachant type for a given final pH.
    • Pb immobilization occurs through adsorption and precipitation in the neutral to alkaline pH range (6-12).
    • At very high alkalinity (>12) or acidic conditions (<6), Pb solubility increases, impacting leachability.