주물사업장의 입자상물질 입경분포 및 비산배출 특성

Abstract

Objectives: This study was performed to measure and evaluate the concentration, size distribution and fugitive emission of particulate matter from process operations at foundries. Methods: Particle matter was collected from three foundries, and samples were also collected from a background site for calculating the fugitive emission concentration of the foundries. For the collection of the samples, a Nanosampler cascade impactor was used. Results: The concentration of TSP in the samples collected from the three foundries was 0.675~1.222 mg/m3, PM10 was 0.525~1.018 mg/m3 and PM2.5 was 0.192~0.615 mg/m3. The mass size distribution was bimodal or monomodal with maximum peak at two stage(size 2.5~10 μm). The mass median aerodynamic diameter(MMAD) was 1.80~3.98 μm. The fugitive emission concentration of TSP varies in the range of 0.65 to 1.21 mg/m3, which exceeds the emission standard of fugitive dust(0.5 mg/m3). Conclusions: Particle concentration and size is an important industrial hygiene factor to protect foundry workers. Furthermore, the presence of high emission of particulate pollutants has a significant negative impact on the ambient air of the study area. Therefore, it is important to improve both the process and prevention facility in oder to reduce particulate pollutants in foundries.