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Sequential extraction for evaluating the leaching behavior of selected elements in municipal solid waste incineration
Su-Jeng Huang1, Cheng-Yuan Chang, Do Trong Mui
1Department of Biomedical Engineering and Environmental Science, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC.
Journal of Hazardous Materials
|May 5, 2007
Summary
A sequential extraction method determined trace element binding forms in municipal solid waste incineration (MSWI) fly ash. Many elements, including toxic metals like lead and cadmium, show high mobility and potential environmental release.
Area of Science:
- Environmental Chemistry
- Geochemistry
- Analytical Chemistry
Background:
- Municipal solid waste incineration (MSWI) fly ash contains trace elements.
- Understanding the binding forms and leaching behavior of these elements is crucial for assessing environmental impact.
Purpose of the Study:
- To determine the binding forms of trace elements in MSWI fly ash.
- To evaluate the leaching behavior and potential environmental risks of these elements.
Main Methods:
- Sequential extraction method applied to MSWI fly ash.
- Elemental analysis using ICP-AES and ICP-MS.
- Morphological and mineralogical analysis using SEM.
- Validation with a certified reference material (BCR No. 176).
Main Results:
- The method accurately determined elemental concentrations, with good agreement between fraction sums and total concentrations.
- Extraction efficiencies were generally high (>80%), except for Cr and V.
- Elements like Ca, K, Na, Pb, Zn, Cd, Cu, and Sr demonstrated significant mobility in fly ash.
- Toxic elements (Pb, Cd, Zn, Cu) have a high potential for environmental release under mild conditions.
Conclusions:
- The sequential extraction method effectively characterizes trace element binding forms in MSWI fly ash.
- A substantial portion of mobile elements, including toxic metals, poses an environmental risk due to potential leaching.
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