• 제목/요약/키워드: Reverse osmosis membrane

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향류식 역삼투 나권형 모듈을 이용한 염분리농축 특성 해석 (Analysis of the Salt Separation and Concentration Using Counter-current Reverse Osmosis Spiral Wound Module)

  • 조한욱;민병렬;최광호
    • 멤브레인
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    • 제4권3호
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    • pp.142-151
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    • 1994

  • 역삼투 공정을 농축공정에 이용하기 위해 향류식 역삼투 나권형 모듈을 고안, 제작하여 염수의 농축실험을 수행하였다. 역삼투 분리의 배제도와 농축도의 관계를 고찰한 결과, 배제유량에 대한 투과유량의 비가 양쪽 관계의 중요한 매개 변수이며, 반사계수 값에 따라, 역삼투막의 배제도와 농축도가 Spiegler-Kedem 식의 경향을 따른다. 향류식 역삼투 공정은 일반 역삼투 농축 공정에 비해 농축의 장애 요소인 삼투압차를 효과적으로 저하시키는 효과가 있으며 농축도가 상대적으로 우수하였다. 향류식 나권형 모듈의 수치모사 결과 농축공정의 농축도 증가를 위해서는 모듈의 지름보다 모듈의 길이를 늘리는 것이 유리함을 알 수 있었다.

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Pretreatment in Reverse Osmosis Seawater Desalination: A Short Review

  • Valavala, Ramesh;Sohn, Jin-Sik;Han, Ji-Hee;Her, Nam-Guk;Yoon, Yeo-Min
    • Environmental Engineering Research
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    • 제16권4호
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    • pp.205-212
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    • 2011

  • Reverse osmosis (RO) technology has developed over the past 40 years to control a 44% market share in the world desalting production capacity and an 80% share in the total number of desalination plants installed worldwide. The application of conventional and low-pressure membrane pretreatment processes to seawater RO (SWRO) desalination has undergone accelerated development over the past decade. Reliable pretreatment techniques are required for the successful operation of SWRO processes, since a major issue is membrane fouling associated with particulate matter/colloids, organic/inorganic compounds, and biological growth. While conventional pretreatment processes such as coagulation and granular media filtration have been widely used for SWRO, there has been an increased tendency toward the use of ultrafiltration/microfiltration (UF/MF) instead of conventional treatment techniques. The literature shows that both the conventional and the UF/MF membrane pretreatment processes have different advantages and disadvantages. This review suggests that, depending on the feed water quality conditions, the suitable integration of multiple pretreatment processes may be considered valid since this would utilize the benefits of each separate pretreatment.

  • https://doi.org/10.4491/eer.2011.16.4.205 인용 PDF KSCI KPUBS

정밀여과·나노여과·역삼투 막에 의한 세슘과 요오드의 제거 (Removal of cesium(137Cs) and iodide(127I) by microfiltration·nanofiltration·reverese osmosis membranes)

  • 채선하;김충환
    • 상하수도학회지
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    • 제28권5호
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    • pp.549-554
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    • 2014

  • This study was evaluated the applicability of the membrane filtration process (Micro Filtration (MF), nanofiltration membranes (NF), reverse osmosis (RO)) on the major radioactive substances, iodine ($I^-$) and cesium ($Cs^+$) using membranes produced in Korea and domestic raw water. Iodine ($I^-$) or cesium ($Cs^+$) in the microfiltration membrane (MF) process could not be expected removal efficiency by eliminating marginally at the combined state with colloidal and turbidity material. At the domestic raw water (lake water, turbidity 1.2 NTU, DOC 1.3 mg/L) conditions, nanofiltration membrane (NF) and reverse osmosis (RO) showed a high removal rate of about 88 ~ 99% for iodine ($I^-$) and cesium ($Cs^+$) and likely to be an alternative process for the removal of radioactive material.

  • https://doi.org/10.11001/jksww.2014.28.5.549 인용 PDF KSCI