Chemical Emissions in a Thermomechanical Pulp Production Plant

Abstract

Following worker reports of irritation, chemical emissions from all production steps in a thermomechanical pulp production plant were studied. Sampling techniques were chosen to allow capture of a wide spectrum of compounds, including gaseous and particulate organic compounds (including terpenes and aldehydes, compounds suspected of causing the reported irritation), total dust, and gases. The only compounds detected in significant concentrations were α- and β-pinene, the primary components of turpentine, a recognized irritant. Carbon monoxide levels reached 15 ppm. The emission sources of these contaminants were random leaks from equipment rather than specific and persistent point sources. A direct-reading photoionizer proved useful in rapidly locating the leaks. The implementation of a program aimed at eliminating and caulking leaks, within the regular maintenance program, would reduce airborne contaminant levels.