Air purification

 Among several pollutions, the air problem is considered as one of the major environmental issues throughout the world. Major air pollutants include CO, VOC, and oxides of sulfur, and nitrogen, simply called as SOx and NOx. They are usually produced in flue gases emitted from combustion sources, like industrial power plants and transportation vehicles. Especially NOx and SOx take significant portion of the air pollutant emission, and they mainly participate in the formation of secondary particulate matter. Some other pollutants, including H2S and Cl2, cause serious odor problem and corrosion of construction, and they are usually emitted from wastewater treatment facilities. Therefore, various treatment methods for air pollutants have been studied such as filtration, absorption and adsorption, catalytic techniques, and electrical discharge processes.

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 Among them, the wet-scrubber, which bases on the principle of absorption, is one of the most effective and thus widely applied treatment technologies for air pollutants removal. To enhance the performance of the liquid-gas mixing effect, our research group developed a novel scrubber system applying a specially designed impeller. A sirocco fan-type impeller, a radial impeller, was equipped with mesh sheet for the generation of micro-sized liquid particles. Through computational fluid dynamics (CFD) analysis, impeller is continuously being developed and modified to maximize the efficiency of liquid-gas contact. Our innovative impeller-based scrubber system was developed not only in lab-scale, but more practically in pilot scale for both laboratory experiment and field test.