• Title/Summary/Keyword: reverse osmosis membrane

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A Study on Chlorine Resistance Improvement of Reverse Osmosis Membrane by Surface Modification (역삼투 분리막의 표면개질을 이용한 내염소성 향상에 관한 연구)

  • Kim, Younggil;Kim, Nowon;Lee, Yong-Taek
    • Membrane Journal
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    • v.15 no.4
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    • pp.320-329
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    • 2005
  • Polyamide membrane degradation by chlorine has been studied to improve membrane durability. In this study, it was found that the salt rejection was reduced rapidly and flux of the membrane was increased slowly far membrane treated under chlorine condition. In order to improve resistance to chlorine of the polyamide reverse osmosis membrane, fluorine-containing silane coupling agent (FSCA) was introduced to surface modification. Surface properties and chlorine resistance of silane modified membrane were compared with virgin membrane. It was found that the surface of silane modified membrane has dense structure according to FSCA concentration increasing. The results of surface analysis suggest that FSCA retrieved a severe change in the hydrophobicity and surface roughness. In addition, it appears that FSCA can enhance chlorine resistance due to the interaction of such substance with free radical chlorine.

Surface Modification of Reverse Osmosis Membrane with Diphenylamine for Improved Chlorine and Fouling Resistance (Diphenylamine에 의해 표면개질된 역삼투막의 내염소성 및 내오염성 향상)

  • Kwon, Sei;Jee, Ki Yong;Lee, Yong Taek
    • Membrane Journal
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    • v.23 no.6
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    • pp.439-449
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    • 2013
  • This study investigated the aromatic polyamide reverse osmosis membrane was modified with diphenylamine (DPA) for enhanced chlorine and fouling resistance and how to optimize. DPA has high reactivity and thermo chemical stability. The performance of a modified membranes was investigated and its surface analyzed using atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and contact angle measurement. The experiment was conducted while changing the conditions of temperature and DPA solution concentration.

Effect of MWCNTs/PSf support layer on the performance of polyamide reverse osmosis membrane (탄소나노튜브가 첨가된 폴리술폰 지지체가 폴리아미드 역삼투막의 성능에 미치는 영향)

  • Min, Choong-Sik;Kim, Seung-Hyun
    • Journal of Korean Society of Water and Wastewater
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    • v.34 no.2
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    • pp.127-137
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    • 2020
  • In this study, a MWCNT(multi-wall carbon nanotube) was added to polysulfone(PSf) support layer to improve flux of TFC(thin film composite) RO(reverse osmosis) membrane. Two different kinds of MWCNT were used. Surfaces of some MWCNTs were modified hydrophilically through acid treatment, while those of other MWCNTs were modified through heat treatment to maintain their hydrophobicity. MWCNT/PSf support layer was prepared by adding PSf to the NMP mixed solvent containing 0.1 wt% MWCNTs using a phase inversion method. The surface porosity of the MWCNT/PSf support increased by 42~46% while its surface pore size being maintained. The TFC RO membrane made of MWCNT/PSf support layer showed a 20% flux increase while its salt rejection characteristics is sustained. In addition, the MWCNT/PSf support layer has better mechanical stability than the PSf support layer, there resulting in an increased resistance of flux reduction due to physical pressure.

Accumulation of Food Wastes Liquid Fertilizer using Reverse Osmosis Membrane System (역삼투막을 이용한 음식폐기물 액비의 농축)

  • Cha, Gi-Cheol;Hwang, Myoung-Goo;Lee, Myung-Gyu;Tae, Min-Ho
    • Journal of Korean Society on Water Environment
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    • v.18 no.2
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    • pp.159-168
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    • 2002
  • A lab-scale Reverse Osmosis(RO) membrane reactor was installed to investigate the membrane permeability, characteristics of membrane fouling at each conditions, and performance of elimination at different trans-membrane pressure(TMP) in the liquid fertilizer accumulated system. Experimental setup was divided to three different TMP conditions. As a result of experiment, permeability of RO membrane was proportional to the increase of TMP and temperature. After experiment was completed, two types chemical cleaning(remove the organic foulant and inorganic foulant) was done, and recover rate of permeability was each 99.8, 99.7 and 99.7%, respectively. From this experimental data, membrane fouling could be determined that the most of it was recoverable in this system, and major reason of fouling was concentration polarization. Elimination rate of solute substance in the liquid fertilizer indicated very stable(above 99%), except ammonia nitrogen, and the most stable elimination rate was investigated at the highest TMP condition (Run 3).

Patents Review on the Seawater Desalination Plant and Technology Using Reverse Osmosis Membrane Process (SWRO 해수담수화 플랜트 기술 관련 특허 동향 분석)

  • Cho, Jin Woo;Han, Ji Hee;Lee, Seock Heon;Sohn, Jin Sik;Yang, Jeong Seok;Kim, Dong Ha
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.3
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    • pp.343-350
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    • 2008
  • Many reports have warned of insufficient water supply in most countries in future and prospected providing safe and clean water become more difficult by lack of access to sustainable drinking water resources. Several facts and figures explained the impact by natural climate change and human activity results in the water scarcity and deterioration. Among many scientific solutions, the seawater desalination using a reverse osmosis membrane, so called SWRO (Seawater Reverse Osmosis) process, has been recognized as one of the most promising alternatives because of its stability and efficiency in producing large amount of drinking water from seawater through desalination by membrane filtration. Recently, in Korea, numerous researches are conducted to develop more productive and cost effective SWRO process for its wide implementation. The objective of this paper is to review the patents concerning SWRO technologies involving the plant engineering, maintenance including pretreatment of seawater and fouling control, module design, and mechanical units development for energy saving. The patents in Korea, U.S., Japan, Europe, and PCT were intensively researched and analyzed to provide the state of the art as well as leading edge technology on SWRO. This information can hopefully suggest meaningful guidelines on future research and development.

Investigation of Organic Fouling with AFM(Atomic Force Microscope) in Reverse Osmosis Membrane and Forward Osmosis Membrane (FO와 RO막에서 AFM(Atomic Force Microscope)을 이용한 유기 막 오염 연구)

  • Kuk, Ji-Hoon;Lee, Sang-Youp;Hong, Seung-Kwan
    • 한국방재학회:학술대회논문집
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    • 2010.02a
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    • pp.102.1-102.1
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    • 2010
  • 대체수자원 중 막여과 기술에 대한 관심이 지속적으로 높아지고 있다. 하지만, 이러한 막여과 기술에는 fouling이 발생시 효율저감, flux저감, 소모에너지 증대 등 문제점이 발생한다. 이러한 fouling저감을 위해 막 표면특성분석을 통한 기초연구가 필요하다고 보고 이 연구를 진행하였다. AFM을 이용하여 CML입자와 막의 상호작용을 통해 초기 막오염 경향을 예측할 수 있다.

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Reuse of treated wastewater from steel industry by reverse osmosis membrane: flux decline study

  • Kwon, Tea-Ouk;Lee, Jae-Wook;Moon, Il-Shik
    • Proceedings of the Membrane Society of Korea Conference
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    • 2004.05a
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    • pp.199-202
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    • 2004
  • Membrane technology is widely employed as a means of producing various qualities of water from surface water, well water, brackish water and seawater. This is also used in industrial wastewater treatment and its recycling process. A large volume of wastewater is generated by the steel industry. Presently, the treated wastewater from the steel industry cannot be recycled, because some of its components cause either direct or indirect problems.(omitted)

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Treatment and Reuse of Acrylic Wastewater using Membrane Separation System

  • Lee, Kwanghyun
    • Proceedings of the Membrane Society of Korea Conference
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    • 2004.05a
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    • pp.117-120
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    • 2004
  • The separation characteristics were investigated with the variations of pressure and temperature using ultrafiltration and reverse osmosis membrane module sets composed of different membrane types and materials. TDS, T-N and COD removal efficiencies were not affected and low with the change of temperature and pressure in case of using UF modules contained in module set 1, 2, 3. TDS, T-N and COD removal efficiencies were very high in RO modules. The final water quality of acrylic wastewater was satisfied within the discharge limit value of plant wastewater. It was known that membrane module sets could be used for the reuse of wastewater.

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Syntheses of chlorine resistant reverse osmosis membranes

  • Kim, Nowon;Lee, Yong-Taek
    • Proceedings of the Membrane Society of Korea Conference
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    • 2004.05a
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    • pp.170-174
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    • 2004
  • Most of thin film composite reverse osmosis membranes include amide linkages, which are susceptible to chlorine attack resulting in N-chloro derivatives. This study examined a new method based on post-treatment of reverse osmosis membrane with various silane derivatives to improve chlorine resistance. The silane derivatives contain one alkyl group and three alkoxy groups such as trifluoromethyltrimethoxysilane, 3-aminopropylmethoxydiethoxysilane and 3, 3, 3-trifluoropropyltrimethoxysilane. Compared to commercial membranes, silane derivatives coated membranes showed significantly enhanced chlorine durability.

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