(A) study on internal-filtration system for continuous high cell density culture = 고농도 연속 배양을 위한 내부 여과 시스템에 관한 연구

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Among the options for high productivity in fermentation processes, bioreactor system development, as well as development of strains with high activity and optimization of operating conditions, are very important. In order to obtain high cell densities it is essential to retain cells inside the reactor as long as possible. For this purpose, cell recycle with internal membrane was adopted. All the ceramic filters used in this study for the internal filter system were tubular type and made by a sintering process. The average pore size of symmetric and asymmetric ceramic membrane was 0.3 and 0.005㎛ respectively. The pore size of stainless steel used in this study was 2㎛. For the optimum design of the internal membrane module, a relationship between the radius of the membrane tube and the ratio of the membrane surface per effective fermentation volume was worked out. It was found that there is an optimum dimensionless radius (r/R) in order to achieve the maximum ratio of the membrane surface area : fermentation volume. Factors affecting the permeation flux during the filtration of fermentation medium and broth by using a symmetric and an asymmetric ceramic membrane were investigated in an internal filter bioreactor. After sterilization of the fermentation medium the flux of the asymmetric membrane was 1.8 folds higher than that before sterilization. At 100g/l glucose, flux index (Fi) at steady state was only 21.8% for the asymmetric membrane and 42.2% for the symmetric membrane. When cell free broth was filtered, Fi at the steady state was 48% for the symmetric membrane and 21% for the asymmetric membrane. For the asymmetric membrane, a decline in the flux by nearly 80% was observed when 100g/l glucose and 8.5g/l yeast extract coexisted in the medium. The dual function of the cake layer during the filtration of the fermentation broth was investigated in depth and a mathematical model was also developed in order to describe the dual function of the cake layer qua...
Advisors
Chang, Ho-Namresearcher장호남researcher
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
1998
Identifier
133630/325007 / 000935140
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학공학과, 1998.2, [ xvii, 146 p. ]

Keywords

Fouling reducing system; Modeling of filter fouling behavior; Internal filtration module; Long-term continuous high cell density culture; 장기 연속고농도배양; 필터여과성능 개선 시스템개발; 필터여과성능 모델링; 내부여과 모듈

URI
http://hdl.handle.net/10203/28771
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=133630&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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