The Efficiency of Functional Activated Carbon Non-woven Fabric Filters for Fine Dust Reduction

초록

Particulate matter (PM) concentrations are significantly higher in urban railway tunnels (178.1 μg/m3) than in metropolitan areas (49 μg/m3). Nitrogen oxide (NOx) concentrations, which are a direct cause of lung disease, have been found to exceed the atmospheric standard of the Ministry of Environment in tunnels in Korea. Dust generated by trains is scattered at high speed along tunnels, making filtration difficult. The development of filters that can be used in tunnels is urgently required. In this study, the results of using an activated carbon filter (ACF) were analyzed and compared with the laboratory-scale PM adsorption using functional activated carbon non-woven fabric filters (Cerebasel, Cerecore) that can be manufactured in Korea. The fine PM concentration, filter depth, and flow rate in the tunnel were the experimental variables. We compared PM concentrations before and after the filter experiments, and calculated the PM removal efficiency to determine the optimal conditions. A comprehensive examination of the experimental variables and differential pressure showed that the optimal conditions for the Cerecore filters were a wind speed of 3.0 m/s and pressure of 600 mm. The Cerecore filter removal efficiency was 53.5% for PM10 and 40.3% for PM2.5. Although the PM removal efficiency was relatively low in indoor and outdoor tests, the results indicated a potential applicability, with the filters having various advantages over alternative particle removal methods. Reproducibility tests showed that the functional activated carbon non-woven fabric filters could be washed and reused, and their ease of maintenance made them suitable for various settings.

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