Microalgae harvesting technology based on dynamic filtration with rotating disk = 회전체 장착형 분리막 여과 기반의 미세조류 수확 기술 연구

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A dynamic filtration method with a rotating disk was developed for effective microalgal cell harvesting. Firstly, its harvesting performance was investigated for different rotation speeds and disk configurations. Even at high biomass concentrations, increasing the rotation speed effectively helped improve the permeate flux mitigating mainly cell cake formation and to some degree adsorption fouling with the help of high shear stress created on the membrane surface. Cross-flow velocity and shear stress on the membrane surface were significantly higher with the perforated disk than those with the solid disk, which led to a more effective fouling alleviation and higher permeate flux. The performance of the dynamic filtration method developed in this study was compared with other methods of coagulation, electro-flotation, electro-coagulation-flotation, and centrifugation. It turned out to be best suited with desirable features of no biomass loss, high concentration of harvested biomass, and moderate energy consumption. A surface-modified membrane was tested for further reduction of adsorption fouling which could not be effectively removed even under high-shear conditions. The membrane coated by a hydrophilic polymer clearly exhibited an increased hydrophilicity, reduced mean pore size, and neutralized surface charge, which led to a decreased adsorption fouling and consequently an increased permeate flux. An integrated filtration system was newly developed in which the impeller of the circulating centrifugal pump acted as rotating disk also. Such pump-integrated module resulted in a simplified system and a much less energy consumption.
Advisors
Chang, Yong Keunresearcher장용근researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2017.2,[viii, 120 p. :]

Keywords

dynamic filtration▼arotating disk▼amicroalgae harvesting▼afouling▼ahigh biomass concentration; 분리막 여과▼a회전체▼a미세조류 수확▼a막오염▼a고농도 바이오매스

URI
http://hdl.handle.net/10203/264920
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=866944&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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