• Title/Summary/Keyword: hollow-fiber membrane

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A study on enhancing the bond strength of coating layer with support in preparation of low-pressure RO hollow fiber membranes (저압용 역삼투압 중공사형막 제조시 코팅층의 결합력 향상을 위한 연구)

  • 염충균;최정환;이정민;이정빈
    • Membrane Journal
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    • v.11 no.2
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    • pp.83-88
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    • 2001

  • A methodology for enhancing the bond strength of a coating layer with a support has been established in preparing low-pressure reverse osmosis mO) hollow fiber which would experience shear badly in flowing feed un it. Prior to coating process, the support membrane, ultrafiltratiun polysulfone(PS) hollow fibers was pretreated with a reaction solution containing glutaraldehyde (GAl which has a good affinity to the suppurt membrane material as well as a reactivity to some of the cunstituents of cuating layer subsequently formed on the support by interfacial polymerization. Therefore, the reactant GA distributed unifonnly over the support layer through the pretreatment could provide a strong adhesive bond between the coating layer and the support, sticking fast to the support membrane through physical bond and, at the same time, connecting its functional group with the coating laycr by chemical bonding. Due to the strong adhesive bond, the resulting hollow fiber membrane showed an excellent long-tcnn stability in pcnneation.

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Effect of Twisted Hollow Fiber Membranes in a Module: Computational Fluid Dynamics Simulations on the Pressure and Concentration Profile of the Module in the forward Osmosis (비틀린 중공사막이 모듈에 미치는 영향: 전산 유체역학 시뮬레이션을 통한 정삼투 모듈의 압력과 농도 분포)

  • Kim, Suhun;Lee, Chulmin;Kim, In S.
    • Membrane Journal
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    • v.30 no.1
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    • pp.66-77
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    • 2020

  • The current study focused on the effect of twisting hollow fibers (HFs) in a module during forward osmosis operation mode. Computational fluid dynamics simulation was employed for a straight HF module and twisted modules with five different angles to predict the mass transfer and observe the draw solution profile in terms of concentration and pressure. The simulation results showed that when the membranes were twisted, the concentration was distributed more evenly and the pressure at the module outlet increased gradually as the twisting angle increased. As pressure at the outlet increased, the fluid velocity inside the membrane decreased and the residence time of fluid increased, thereby facilitating mass exchange across the membrane. This is evidenced by a doubling of the ratio of water flux through the membrane in module flux when the HFs were twisted.

  • https://doi.org/10.14579/MEMBRANE_JOURNAL.2020.30.1.66 인용 PDF KSCI