Controlling formaldehyde emissions with boiler ash.
Fluidized wood ash reduces formaldehyde in air from about 20 to <1 ppmv. Methanol is removed to a much lower extent. The efficiency of formaldehyde reduction increases with increasing moisture content of the ash. Sorption of formaldehyde to ash can be substantially accounted for by partitioning to the water contained in the ash followed by rate-controlling binding to the ash solids. Adsorption occurs at temperatures of up to 165 degrees C; oxidation predominates thereafter. It is proposed that formaldehyde could be stripped from an air stream in a fluidized bed containing ash, which could then be returned to a boiler to incinerate the formaldehyde.
Cowan
Jennifer
J
Institute of Paper Science and Technology, and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0620, USA.
Abu-Daabes
Malyuba
M
Banerjee
Sujit
S
D000327:Adsorption; D000397:Air Pollution / Q000517:prevention & control*; D005404:Fixatives / Q000737:chemistry*; D005557:Formaldehyde / Q000737:chemistry*; D017745:Incineration; D010084:Oxidation-Reduction; D013696:Temperature; D014934:Wood
D005404:Fixatives; D005557:Formaldehyde