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Controlling formaldehyde emissions with boiler ash.

Jennifer Cowan1, Malyuba Abu-Daabes, Sujit Banerjee

  • 1Institute of Paper Science and Technology, and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0620, USA.

Environmental Science & Technology
|August 2, 2005
PubMed
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Fluidized wood ash effectively removes formaldehyde from air, with efficiency boosted by moisture content. This ash can then incinerate the captured formaldehyde in a boiler.

Area of Science:

  • Environmental Chemistry
  • Materials Science

Background:

  • Formaldehyde is a common air pollutant.
  • Effective methods for formaldehyde removal are needed.

Purpose of the Study:

  • To investigate the use of fluidized wood ash for formaldehyde removal from air.
  • To understand the mechanism of formaldehyde sorption and removal by wood ash.

Main Methods:

  • Testing formaldehyde reduction in air using fluidized wood ash.
  • Analyzing the effect of ash moisture content on efficiency.
  • Investigating temperature-dependent adsorption and oxidation processes.

Main Results:

  • Fluidized wood ash reduced formaldehyde from ~20 to <1 ppmv.
  • Methanol removal was significantly lower.

Related Experiment Videos

  • Higher moisture content in ash increased formaldehyde reduction efficiency.
  • Sorption involves partitioning to water and binding to ash solids.
  • Adsorption occurred up to 165°C, with oxidation dominating at higher temperatures.

    • Conclusions:

    • Fluidized wood ash is a promising material for formaldehyde air purification.
    • A fluidized bed system using ash could effectively capture and subsequently incinerate formaldehyde.