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[Acid neutralizing capacity and elements leaching behavior from MSWI fly ash under static pH condition].

Feng Wang¹, Wei Wang, Xiao Wan

¹Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. wangfeng04@mails.tsinghua.edu.cn

Huan Jing Ke Xue= Huanjing Kexue

|July 11, 2008

Summary

Fly ash exhibits significant acid neutralizing capacity (ANC), with element leaching varying based on controlled pH. This study reveals distinct leaching patterns for major and heavy metals, crucial for understanding long-term environmental impacts.

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Area of Science:

Environmental Chemistry
Geochemistry
Materials Science

Context:

Fly ash utilization in environmental applications.
Assessing the environmental risks of coal combustion byproducts.
Understanding the long-term stability and leaching behavior of fly ash.

Purpose:

To investigate the acid neutralizing capacity (ANC) of fly ash.
To analyze the leaching behavior of major and heavy metals from fly ash under controlled pH conditions.
To evaluate the potential long-term leachability of elements from fly ash.

Summary:

pH-stat titration revealed rapid initial acid consumption by fly ash, with an inflection point in dissolution rate after approximately 20 hours.
Proton buffering capacity increased with decreasing controlled pH values.
Elements displayed varied leaching behaviors: K, Na, Ca, Cl leaching was independent of buffering; Si and SO4(2-) showed transient release; Cd and Zn release correlated with ANC; Cu, Pb, and Cr leaching was lower than ANC.

Impact:

pH-stat titration provides detailed insights into fly ash neutralization processes.
This method aids in evaluating the potential leachability of heavy metals.
Results are valuable for predicting the long-term environmental behavior of fly ash.