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[Modification of MSWI fly ash by using anionic chelating surfactant].
Hou-Hu Zhang1, Guang-Ren Qian, Xiao-Lan Zhang
1College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, China.
Huan Jing Ke Xue= Huanjing Kexue
|October 11, 2005
Summary
This study enhances municipal solid waste incineration (MSWI) fly ash by using anionic chelating surfactants for surface modification. The treated fly ash demonstrates a high active ratio and effectively immobilizes heavy metals, enabling waste reutilization.
Area of Science:
- Environmental Chemistry
- Materials Science
- Waste Management
Context:
- Municipal solid waste incineration (MSWI) fly ash presents a significant disposal challenge.
- Reutilization of MSWI fly ash is crucial for sustainable waste management.
- Surface modification is key to enhancing fly ash properties for value-added applications.
Purpose:
- To explore the surface modification and heavy metal fixing capacity of MSWI fly ash using anionic chelating surfactants.
- To optimize conditions for achieving a high active ratio in modified fly ash.
- To evaluate the effectiveness of the treatment in immobilizing heavy metals.
Summary:
- Anionic chelating surfactants were used to modify MSWI fly ash, improving its surface properties.
- Optimal conditions (7.0mL/100g fly ash dosage, 15min modification, 75°C) yielded an active ratio exceeding 95%.
- The modified fly ash demonstrated strong heavy metal fixing capacity, confirmed by the Toxicity Characteristic Leaching Procedure (TCLP).
Impact:
- Provides a method for the high-value reutilization of MSWI fly ash.
- Offers a stabilization technique for hazardous components in fly ash.
- Contributes to circular economy principles by transforming waste into a usable product.