화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.13, No.4, 512-517, July, 2007
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Reuse of Waste Oyster Shells as a SO2/NOx Removal Absorbent
Jong-Hyeon Jung, Kyung-Seun Yoo1, Hyun-Gyu Kim2, Hyung-Keun Lee3, and Byung-Hyun Shon4, †
  • Department of Health Administration, Sorabol College, Gyeongbuk 780-711, Korea
  • 1Department of Environmental Engineering, Kwangwoon University, Seoul 139-701, Korea
  • 2Busan Center, Korea Basic Science Institute (KBSI), Busan 609-735, Korea
  • 3Korea Institute of Energy Research, Daejeon 305-343, Korea
  • 4Department of Environmental Engineering, Hanseo University, Chungnam 356-820, Korea
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An enormous amount of waste oyster shells are dumped into public waters and landfills, which causes a bad odor as a consequence of the decomposition of organics attached to the shells. Marine pollution by waste oyster shells has become one of the most serious problems in the mariculture industry in Korea. To determine the feasibility of recycling waste oyster shells as desulfurization/denitrification sorbents, pretreating experiments and the SO2/NOx removal activity were investigated. Through pretreating processes, such as calcination and hydration, the specific surface area and pore volume of waste oyster shells were increased over those of the fresh particles, making it possible to enhance the removal capacity in acid gases. XRD analysis of calcined waste oyster shells exhibited peaks characteristic of calcium oxide, whereas raw waste oyster shells showed that the main peaks were characteristic of calcium carbonate. The optimal temperatures for calcination and hydration were 800∼850 and 90 ℃, respectively. SO2/NOx removal experiments were under taken to test the reactivity of absorbents in a fixed bed reactor. The SO2 removal activity and reaction rate of the calcined/hydrated waste oyster shells were higher than those of calcined/hydrated limestone. This finding clearly indicates that absorbents prepared from waste oyster shells are substitutes for commercial limestone and can be applied directly to industries attempting to reduce their emissions of SO2 and NOx.
Keywords:absorbent;calcination;hydration;limestone;oyster shell
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