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Organic carbon leaching behavior from incinerator bottom ash
A L Guimaraes1, T Okuda, W Nishijima
1Department of Material Science and Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8527, Japan. alguim@hiroshima-u.ac.jp
Journal of Hazardous Materials
|May 6, 2006
Summary
This study reveals that incinerator bottom ash from municipal solid waste has two organic carbon leaching fractions influenced by calcium and pH, unlike industrial waste ash. Understanding this behavior is key for controlling environmental risks from landfills.
Area of Science:
- Environmental Science
- Geochemistry
- Waste Management
Background:
- Controlling organic carbon emissions from landfills is crucial for minimizing environmental risks.
- Incinerator bottom ash (IBA) is a significant waste stream with potential for organic carbon leaching.
Purpose of the Study:
- To investigate the leaching behavior of organic carbon from IBA.
- To determine the effects of calcium (Ca) and pH on dissolved organic carbon (DOC) leaching from IBA.
Main Methods:
- pH-stat leaching experiments were used to assess DOC and major element leaching.
- Column leaching experiments evaluated the relationship between DOC and Ca leaching.
Main Results:
- Municipal solid waste (MSW) IBA exhibited two DOC fractions: Ca-independent at alkaline-neutral pH and Ca-dependent at acidic pH.
- Industrial solid waste (ISW) IBA showed only Ca-independent DOC leaching.
- Differences in Ca addition during incineration and waste composition (paper-to-plastic ratio) influenced leaching behavior.
Conclusions:
- The leaching behavior of organic carbon from IBA is complex and depends on waste source and incineration conditions.
- Understanding these distinct leaching fractions is vital for effective environmental risk assessment and management of IBA in landfills.