Application of Air Purifier Filter Unit to Remove Particulate Matter in Semi-Outdoor System
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Abstract
PM2.5 and its chemical compositions are more concerned due to their impact on human health. This research characterizes particulate matter with the size of 2.5 µm and smaller (PM2.5) and total suspended particle (TSP) in three locations at Faculty of Engineering, Kasetsart University (Bangkhen Campus, Bangkok). Air purifier filter unit was utilized to collect particulate matter in order to determine the toxic metal components such as arsenic, cadmium, chromium, nickel, and lead by using the inductively couple plasma optical emission spectrometer (ICP-OES). The results showed that the daily average concentrations of indoor PM2.5 at locations L01, L02, and L03 were 61.5, 50.4, and 78.8 µg/m3, respectively. For all locations, only arsenic was found at location L03. With the concentration of 7 ng/m3 which were higher than the WHO standard. The air purifier filter unit helped to improve indoor air quality by reducing concentration of PM2.5. The average removal efficiency at locations L01, L02, and L03 proved to be 11.8%, 21.2%, 40%, respectively. However, the downstream concentration of PM2.5 was still higher than the indoor air quality standard (IAQ). Therefore, the air purifier filters should be further modified to improve the removal efficiency.
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