Characterization of emissions from laser removal of surface coatings

Abstract

Laser removal of surface coatings is being considered as an “environmentally friendly” replacement for traditional solvent coating removal processes. The emissions from laser removal of three different samples were investigated in both air and nitrogen environments. Particulate matter was collected and analyzed for metal emissions and selected isocyanates. Vapor emissions were collected and analyzed for volatile organic compounds and selected isocyanates.Several chemicals listed as priority pollutants, including chromium, benzene, and hydrogen cyanide were found in air or nitrogen. Emission factors were estimated for the various compounds for each specific arrangement of coating layers. These emission factors will be useful for comparing emissions of regulated chemicals from laser paint removal processes to other surface coating removal technologies. Proper emissions control technology for laser removal applications may be necessary to prevent worker exposure to the hazardous air pollutants that were detected. Laser removal of paint offers the potential to eliminate the generation of secondary hazardous waste and may reduce air emissions provided proper evaluation and control procedures are established.Laser removal of surface coatings is being considered as an “environmentally friendly” replacement for traditional solvent coating removal processes. The emissions from laser removal of three different samples were investigated in both air and nitrogen environments. Particulate matter was collected and analyzed for metal emissions and selected isocyanates. Vapor emissions were collected and analyzed for volatile organic compounds and selected isocyanates.Several chemicals listed as priority pollutants, including chromium, benzene, and hydrogen cyanide were found in air or nitrogen. Emission factors were estimated for the various compounds for each specific arrangement of coating layers. These emission factors will be useful for comparing emissions of regulated chemicals from laser paint removal processes to other surface coating removal technologies. Proper emissions control technology for laser removal applications may be necessary to prevent worker exposure to the hazardous air pollutants that were dete...