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Continuous CO(2) capture and MSWI fly ash stabilization, utilizing novel dynamic equipment.

Jian-guo Jiang1, Xue-juan Du, Mao-zhe Chen

  • 1Department of Environmental Science and Engineering, Tsinghua University, Beijing, PR China. jianguoj@mail.tsinghua.edu.cn

Environmental Pollution (Barking, Essex : 1987)
|July 7, 2009
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Summary

Municipal solid waste incineration fly ash effectively captures carbon dioxide (CO(2)). Adding water enhances CO(2) sequestration capacity and reduces lead (Pb) leaching, offering a sustainable waste management solution.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Materials Science

Background:

  • Municipal solid waste incineration (MSWI) fly ash is a potential resource for carbon capture.
  • Effective utilization of MSWI fly ash can mitigate environmental pollution.
  • CO(2) capture technologies are crucial for climate change mitigation.

Purpose of the Study:

  • To investigate the CO(2) capture capacity of MSWI fly ash.
  • To evaluate the influence of water content on CO(2) sequestration.
  • To assess the impact of carbonation on fly ash composition and heavy metal leaching.

Main Methods:

  • Development of novel dynamic equipment for continuous gas flow.
  • Experimentation with pure CO(2) and simulated incineration gas.
  • Analysis of fly ash composition before and after accelerated carbonation using elemental analysis.
  • Measurement of lead (Pb) leaching.

Main Results:

  • MSWI fly ash demonstrated high CO(2) capture rates.
  • CO(2) capture capacity increased with water addition (16.3 g/100g without water, 21.4 g/100g with 20% water for pure CO(2)).
  • Accelerated carbonation significantly increased CaCO(3) content (from 12.5% to 54.3%) and markedly reduced Pb leaching (from 24.48 to 0.111 mg/L).

Conclusions:

  • MSWI fly ash is a promising material for CO(2) capture, especially with water addition.
  • The carbonation process enhances CO(2) sequestration and immobilizes heavy metals like lead.
  • This study highlights a sustainable approach for fly ash utilization and carbon mitigation.