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Pb stabilization in fresh fly ash from municipal solid waste incinerator using accelerated carbonation technology
Jiang Jianguo1, Chen Maozhe, Zhang Yan
1Department of Environment Science and Engineering, Tsinghua University, Beijing 100084, PR China. jianguoj@tsinghua.edu.cn
Journal of Hazardous Materials
|May 27, 2008
Summary
Carbonation technology effectively stabilizes heavy metals in municipal solid waste incinerator fly ash. Adding water enhances carbon dioxide absorption, improving lead stabilization by converting it into a less mobile carbonate form.
Area of Science:
- Environmental Engineering
- Geochemistry
- Materials Science
Background:
- Municipal solid waste incinerator (MSWI) fly ash contains hazardous heavy metals.
- Stabilization of these metals is crucial for safe disposal and environmental protection.
Purpose of the Study:
- To investigate the use of carbonation technology for heavy metal stabilization in MSWI fly ash.
- To evaluate the impact of carbon dioxide (CO2) parameters on lead (Pb) stabilization.
Main Methods:
- Carbonation of MSWI fly ash using CO2 absorption.
- Analysis of fundamental parameters: water content, CO2 concentration, diffusivity, and reactivity.
- Characterization using X-ray Diffraction (XRD) and Thermogravimetric Analysis (TGA).
Main Results:
- Addition of ≥10% water significantly accelerated CO2 absorption and fly ash stabilization.
- Low CO2 concentration (0.03%) in air showed limited stabilization within 1 day.
- XRD confirmed CaCO3 formation and heavy metal carbonate precipitation.
- TGA indicated MSWI fly ash has a CO2 sequestration capacity of 3% (w/w).
- CO2 sequestration effectively converted exchangeable Pb into a stabilized carbonated form.
Conclusions:
- Carbonation is a viable technology for stabilizing heavy metals in MSWI fly ash.
- Optimizing water content and CO2 availability enhances stabilization efficiency.
- The process converts hazardous lead into a stable carbonate form, reducing environmental risk.
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