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pp.145-149
The purpose of this study was to determine whether Vermi Cast could be used effectively to remove SO2 from flue gas, and then to investigate optimum adsorption conditions. The Vermi Cast used as adsorbent was mechanically screened with 8∼20 mesh sieve. The adsorption data for S02 were regressed using the Freundlich isotherm. The fit was generally satisfactory (R2=0.945∼0.982). With the temperature changes from 20℃ to 40℃, the constant k in Freundlich isotherm qe = kCe(1/n), decreased from 1.409 at 20℃ to 0.297 at 40℃, and the exponent 1/n were decreased from 0.343 to 0.134. With the bed depth changes from 10㎝ to 30㎝, the adsorption capacity expressed as m㏖ of SO2 adsorbed per g of Vermi Cast increased from 0.247 to 0.381. Moisture content is an important parameter in the SO2 adsorption efficiency. When the moisture content ranging 23∼53% temperature 28℃ the amount of SO2 adsorbed were observed over 0.3m㏖ SO2/g Vermi Cast. The best adsorption capacity was 0.487m㏖ SO2/g Vermi Cast, and it was obtained with moisture content 37%, temperature 20℃. From the above results, it might be concluded that Vermi Cast is effectively available as a good adsorbent to remove SO2 from flue gas.
