• Title/Summary/Keyword: 삼투막

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Reuse of Petroleum Refinery Wastewater Using Reverse Osmosis Membrane (역삼투막을 이용한 정유산업 폐수 재활용 연구)

  • Hwang, Jong-Sic;Sang, Byoung-In;Yoo, Je-Kang;Lee, Kyu-Hyun;Min, Byoung-Ryul;Kim, Byoung-Sik
    • Membrane Journal
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    • v.4 no.4
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    • pp.213-220
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    • 1994
  • Reverse osmosis(R/O) pilot system, which consists of pretreatments and R/O membranes, was demonstrated to regenerate the petroleum refinery wastewater for the process feedwater supply. Despite of the unsteady quality of the wastewater effluent from the process facilities, relatively high salt rejection of 96~99% was obtained and the product water showed a feasible quality for the use of cooling tower feed water. The results of R/O membrane module cleaning with NaOH solution represented that there was some fouling effects on the membrane performance during the period of test due to the ineffective treatment processes proposed and used in this study.

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Ions Removal of Contaminated Water with Radioactive Ions by Reverse Osmosis Membrane Process (방사성이온으로 오염된 물의 역삼투막공정을 이용한 이온제거)

  • Shin, Do Hyoung;Cheong, Seong Ihl;Rhim, Ji Won
    • Membrane Journal
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    • v.26 no.5
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    • pp.401-406
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    • 2016
  • In this study, we have investigated the removal of the low level radioactive ions of Cs and I in water by the reverse osmosis (RO) process. The two RO modules produced in domestic region and the waste RO module after the cleaning process were selected. Then we compared removal performance of both Cs and I. The experiments are conducted by varying the concentration of feed, the pressure. As a results, it was confirmed that all three modules are higher I decontamination factor than Cs. And particularly, for the cleaned RO module, its decontamination factor of I was 1140. Since the results at low pressure condition were better than that at high pressure conditions, the use of the direct installation of RO modules on the tap water might be possible. In addition, it was confirmed that the waste RO module after cleaning process using EDTA, SBS and NaOH, increased the decontamination performance better than before cleaning, in particular, the recovery ratio after cleaning was 6.3% higher.

Improvement of Fouling Resistance with Reverse Osmosis Membrane Using Multi-layer Silane-Epoxy Surface Modification (실란-에폭시 다층 표면개질을 통한 역삼투막의 내오염성 향상)

  • Kwon, Sei;Lee, Yong Taek
    • Membrane Journal
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    • v.25 no.4
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    • pp.332-342
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    • 2015
  • In this study, to solve the major problem of reverse osmosis (RO) membrane, surface of reverse osmosis membrane was modified by silane-epoxy multi layer. Octyltrimethoxysilane (OcTES) was polymerized to membrane surface via cross-linking by Sol-gel method. n = 8 alkylgroup of OcTES formed the branch structure by self assembly. And for improve fouling resistance of RO membrane, Ether group of ethylene glycol diglycidyl ether (EGDE) was given to improve hydrophilicity of RO membrane surface by ring-opening. To analyze structure of RO membrane surface with FE-TEM and AFM. Membrane surface of the ridge and valley structure and the bridge structure was confirmed due to the multi-layer surface modification of OcTES and EGDE. And through the increase of the roughness, the branch structure was formed well on membrane surface. Through the XPS analysis was identified chemical structure of membrane surface. And confirmed that the hydrophilic surface modification is given to the surface of the film through a Contact angle analysis. In optimization of EGDE surface modification condition, was suitable 0.5 wt% EGDE concentraion and $70^{\circ}C$ ring-opening temperature. In result of fouling resistance test and MFI is SUL-H10, $PA-OcTES_{1.0}$, $PA-OcTES_{1.0}-EGDE_{0.5}$ 68.7, 60.4, 5.4 ($10E-8hr/mL^2$), multi-layer surface modified membrane improved fouling resistance.

Preparation and Characterization of Cellulosic Forward Osmosis Membranes (셀룰로오스 계 고분자를 이용한 정삼투막의 제조 및 특성)

  • Jeong, Bo-Reum;Kim, Jong-Hak;Kim, Beom-Sik;Park, Yoo-In;Song, Du-Hyun;Kim, In-Chul
    • Membrane Journal
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    • v.20 no.3
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    • pp.222-227
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    • 2010
  • The purpose of this study is to prepare forward osmosis (FO) membranes using a variety of cellulose-based polymers and to evaluate the performance of difference depending on each of the polymers and additives. Forward osmosis membranes based on cellulose acetate (CA) and cellulose triacetate (CTA) were prepared through phase inversion. The performance of FO membranes developed, such as flux and salt rejection, was compared under the osmotically- and pressure-driven conditions. In CA FO membranes, the execution time of solvent evaporation and membrane annealing induced the change in membrane performance. But the performance of CTA FO membrane was improved by using additives rather than annealing. Moreover, the flux of CTA FO membrane was $4.46\;L/m^2hr$ but that of CA/CTA FO membrane was $8.89\;L/m^2hr$ in FO mode. The CTA FO membrane with blending CA was more efficient to increase FO permeate flow rather than using a single polymer membrane.

역삼투막 재료

  • 김창근
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.31-55
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    • 1998
  • 1. Performance of RO membrane depends on chain structure (packing density) 2. Crosslinking of main chain is essential for the high performance RO membranes 3. Various bisphenols and polyaminostyrene can be promising materials for the fabrication of RO membranes. 4. By using of blend technique of reactant, we can expect broad spectrum of RO membrane and synergetic effects in membrane performance.

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역삼투막의 제조 및 최근 동향

  • 구자영
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.1-30
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    • 1998
  • 1. RO History 2. Asymmetric Membranes by Phase Inversion 3. Thin Film Composite (TFC) Membrane 4. Structure and Property Relationship of TFC Membrane 5. Membrane Materials 6. Tranport Mechanism(Model) 7. Membrane Characters in Separation Process 8. Concentration Polarization and Fouling Phenomenon 9. RO Membrane Module Configuration and System Design 10. Futrue Trend in RO Industry

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Temperature Effect in the process of DAF as pretreatment of SWRO (해수담수화 전처리로서 DAF공정에서 고온의 해수에 대한 영향 특성)

  • Park, Hyunjin;Dockko, Seok
    • Journal of Korean Society of Water and Wastewater
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    • v.26 no.6
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    • pp.807-813
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    • 2012
  • Flocculation and flotation are used as pretreatment steps prior to the reverse osmosis (RO) process. During seawater treatment, high temperature can change the water chemistry of seawater during the process of coagulation. It also affects bubble volume concentration (BVC) and bubble characteristics. Coagulants such as alum and ferric salts at $40^{\circ}C$ can also change flux rates in the seawater reverse osmosis (SWRO) process. In this study, the bubble characteristics in dissolved air flotation (DAF), used as a SWRO pretreatment process, were studied in synthetic seawater at $20^{\circ}C$ and $40^{\circ}C$. The flux of an RO membrane was monitored after dosing the synthetic seawater with coagulants at different temperatures. Results showed that BVC increases as the operating pressure increases and as the salt concentration decreases. The bubble size released at $40^{\circ}C$ is far smaller than that at $20^{\circ}C$The addition of a ferric salt is effective for turbidity removal in synthetic seawater at $20^{\circ}C$; it is more effective than alum. When synthetic seawater was dosed with a ferric salt, the RO membrane flux increased by 27 % at $40^{\circ}C$.

Evaluation of water permeability of forward osmosis membranes using osmotically driven membrane test (랩스케일 정삼투실험을 통한 정삼투막의 수투과도 평가)

  • Lee, Junseo;Kim, Suhan
    • Journal of Korean Society of Water and Wastewater
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    • v.30 no.4
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    • pp.417-425
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    • 2016
  • Desalination is a key technology to overcome water shortage problem in a near future. High energy consumption is an Achilles' heel in desalination technology. Osmotically driven membrane processes like forward osmosis(FO) was introduced to address this energy issue. Characterizing membrane properties such as water permeability(A), salt permeability(B), and the resistance to salt diffusion within the support layer($K_{ICP}$) are very important to predict the performance of scaled-up FO processes. Currently, most of researches reported that the water permeability of FO membrane was measured by reverse osmosis(RO) type test. Permeating direction of RO and FO are different and RO test needs hydraulic pressure so that several problems can be occurred(i.e. membrane deformation, compaction and effect of concentration polarization). This study focuses on measuring water permeability of FO membrane by FO type test results in various experimental conditions. A statistical approach was developed to evaluate the three FO membrane properties(A, B, and $K_{ICP}$) and it predicted test result by the internal and external concentration polarization model.

Narration Drawing & Narration Painting (서사묘${\cdot}$서사회 [敍事描${\cdot}$敍事繪])

  • Baek, Jun-Gi
    • Cartoon and Animation Studies
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    • pp.460-465
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    • 2001
  • 글과 그림 사이에서 진동하는 상호보완적 절층주의로부터 벗어나, 텍스트와 이미지의 벽을 넘어서서 신개념의 그래픽 문법으로 형성되는 ‘제3의 지지체(支持體, referance)'이길 바란다. 더 나아가서는 새로운 장르 개념의 ’참조들${\cdot}$frame work'이 조성되길 바라며 작업을 지속한다. 그 방버론의 적용으로는 보여지거나 인식되는 사물과 사태를 ‘서사적 조망${\cdot}$Narration View'으로 회유하여 서사묘${\cdot}$Narration Drawing, 혹은 서사회${\cdot}$Narration적 담론과 리사이틀의 체계를 구축하고자 한다. 따라서 나의 작업은 개념도 실재(행동)도 아닌 양자의 삼투막(?透幕)과도 같은 것으로 최소한의 표현, 그리고 그에 상응하는 선택과 결정이 주어지게 된다. 마치도 ’평면조건‘위에서 글도 아닌 도상적 스키마의 조그마한 끄나풀 하나를 붙들고 연명하는 미물의 절실함이 그것이리라. 또 한편에서는 글이기도 그림이기도한 한 ’이코노텍트성 Iconotextuality'의 보편적 열람성과 보존성의 현전의 세속적 희열과 자유로움을 느낀다. 일품 회화의 오리지날리티로 벗어나 ‘원고개념’을 전제한 작품제작의 출발은 A4 배상용지 위에서 실현된다. 끊임없이 증식되는 생물학적 상상력의 구축은 매카닉한 기계류의 반복과 중첩 이미지, 확대와 축소의 개념적 확산, 용품과 도구 tool character에 의한 드로잉의 산출 및 페인팅의 점착성으로 이어진다. 실제의 프레임과 패널, 액틀을 쓰지 않는 연유는 좀더 벽에 밀착하여 붙이기를 원하기 때문이다.

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