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Received December 30, 2005
Accepted November 16, 2006
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Attrition of sewage sludge and sludge-based char in a fluidized bed reactor
Department of Environmental Engineering, Pusan National University, Busan 609-735, Korea 1Division of Remediation Technology, QEN Solution, Ulsan 680-190, Korea
kjoh@pusan.ac.kr
Korean Journal of Chemical Engineering, July 2007, 24(4), 660-663(4), 10.1007/s11814-007-0021-y
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Abstract
Fluidized bed pyrolysis has been recognized as an innovative technology for sewage sludge treatment. The physical and attrition properties of sewage sludge are changed through the fluidized bed pyrolysis. The minimum fluidization velocities and attrition rate constants for sewage sludge and sludge based-char were obtained from pressure drop and attrition tests. As a result, sewage sludge with 20% moisture content and char were classified as Geldart B solids and the superficial gas velocity for bubbling fluidization was 0.2142-0.8755m/s. In addition, attrition of the sewage sludge and char was more affected by particle size than by material type. The equations for the overall attrition rate constants are Ka×105=1.09U.14.82 for sludge and ln ka=0.1(U.Umf).13.63 for char, respectively.
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References
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Geldart D, Baeyens J, Powder Technol., 42, 67 (1985)
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Lee SS, Yoo JS, Moon GH, Park SW, Park DW, Oh KJ, Am. Chem. Soc., Div. Fuel Chem., 48 (2003)
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Park YS, Kim HS, Shun D, Song KS, Kang SK, Korean J. Chem. Eng., 17(3), 284 (2000)
