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Received March 6, 2006
Accepted June 26, 2006
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이산화탄소(CO2) 가스에 의한 케이크 여과속도의 향상
The Improvement of Cake Filtration Rate using CO2 Gas Saturation
인하대학교 환경공학과, 402-751 인천시 남구 용현동 253
Department of Environmental Engineering, Inha University, 253, Yonghyun-dong, Nam-gu, Inchon 402-751, Korea
Korean Chemical Engineering Research, October 2006, 44(5), 468-475(8), NONE Epub 14 November 2006
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Abstract
압축성이 큰 케이크에 의한 여과에서는 압력의 증가가 여과속도를 거의 향상시키지 못한다. 이 경우 높은 압력은 여과매체 옆의 케이크 공간률을 급격히 감소시켜 dense skin(치밀층, 緻密層)을 형성하여 이 층이 물의 통과속도를 매우 느리게 하기 때문이다. 실제로 압축성이 큰 케이크의 여과에서 여과속도를 향상시키기 위한 특별한 방법이 없었다. 본 연구에서는 여과 대상액을 여과조작 전에 CO2 가스로 포화시켜 용액에 녹아 있던 CO2 가스가 압력이 급격히 변하는 치밀층에서 기체 상태로 변화하여 치밀층 내에 작은 공간을 확보하고, 그 공간이 물길을 형성하여 여과속도를 향상시킬 수 있는 가능성에 대해 연구하였다.
For the filtration of super compactible cake, the high filtration pressure can not improve filtration rate. As the high pressure, in this case, decreases the cake porosity adjacent to filter medium and thus forms 'dense skin' which decreases the rate of liquid flow in a great extent. Actually, there was no method to improve filtration rate for the filtration with super compactible cake. We propose the saturation of CO2 gas into the suspension before the filtration operation for improving the filtration rate. The dissolved CO2 gas transforms itself into gas phase in the dense skin through which the pressure changes dramatically. The gas secures its space inside the dense skin, and finally forms the flow passages which improve the filtration rate.
Keywords
References
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Tiller FM, Green TC, AIChE J., 19, 1266 (1973)
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D’Arcy HPG, “Les Fontaines Publiques de la Ville de Dijon,” Victor Dalmont, Paris (1856)
Yim SS, Korean J. Chem. Eng., 16(3), 308 (1999)
Yim SS, Kwon YD, Kim HI, Korean J. Chem. Eng., 18(5), 741 (2001)
Yim SS, Song YM, Jun SJ, HWAHAK KONGHAK, 40(3), 330 (2002)
Tiller FM, Chem. Eng. Prog., 51, 282 (1955)
Shirato M, Kato H, Kobayashi K, Sakazaki H, J. Chem. Eng. Jpn., 3, 98 (1970)
Yim SS, Song YM, Kwon YD, Korean J. Chem. Eng., 20(2), 334 (2003)
Tiller FM, Horng LL, AIChE J., 29, 297 (1983)
Tiller FM, Li W, Theory and Practice of Solid/Liquid Separation, 4th ed., Frank M. Tiller and Wenping Li (2002)
Yim SS, Ben-Aim R, “Highly Compressible Cake Filtration: Application to the Filtration of Flocculated Particles,” 4th World Filtration Congress, A1-A7 (1986)
Tiller FM, Crump JR, Ville F, “Filtration Theory in its Historical Perspective, A Revised Approach with Surprises,” 2nd World Filtration Congress, 1-13 (1979)
