• Journal of Korean Society of Water and Wastewater
• /
• v.27 no.5
• /
• pp.555-560
• /
• 2013

A cost analysis method for pretreament processes of a large scale seawater desalination plant was considered using a cost estimation model, WaTER (Water Treatment Estimation Routine). This model is based on cost functions of U.S. EPA to conduct economic analysis of water treatment facilities. A virtual seawater desalination plant which has pretreatment production capacity of $100,000m^3$ per day was chosen as a model plant. Dual media filtration and microfiltration systems were compared as pretreatment process, and the following reverse osmosis process was modeled. As a result, microfiltration showed a price competitiveness in condition of operating with reverse osmosis process by reducing the loads of water treatment and membrane cleaning despite it's high annual cost.

• Proceedings of the Membrane Society of Korea Conference
• /
• 1996.09a
• /
• pp.121-145
• /
• 1996

Due to more stringent regulations in drinking water, membrane separation has been playing an increasingly important role. Seawater desalination by reverse osmosis is a typical example and has been used world-wide. Although the existing technology based on coagulation and media filtration is well established and reliable technology, with the advance of industrial and agricultural activities it is difficult for this technology to remove contaminants such as nitrate and synthetic organic chemicals. To meet the drinking water standards and produce higher quality water, several membrane filtration research programs have been initiated which include Japanese MAC21 and New MAC21 projects. In this paper, potable water application of reverse osmosis (RO) and nanofiltration(NF) and their case histories will be explained in more detail.

• Journal of Industrial and Engineering Chemistry
• /
• v.67
• /
• pp.52-71
• /
• 2018

RO membranes, the core elements for RO process formed using polyamide, have found prominent space in membrane technology. RO membranes with better application perspective could be achieved by precise controlling the kinetics of IP reaction and surface modification strategy. Despite huge progresses, great challenges still exist in trade-off between flux, rejections and fouling. More works are necessary to enhance the performance and stability of RO membranes via surface modification. Further insights into the use of natural monomers are necessary. It is anticipated that this article can provide clues for further in-depth evaluation and research in exploring more advanced RO membranes.

• Environmental Engineering Research
• /
• v.20 no.1
• /
• pp.99-104
• /
• 2015

The purpose of this study is to evaluate the performance of forward osmosis (FO) system for harvesting microalgae cultivated in secondary sewage effluent. Microalgae species used in this study were chlorella sp. ADE4. The drawing agents used for forward osmosis system were seawater and concentrate of sea water reverse osmosis (SWRO) system. Chlorella sp. ADE4 cultured in secondary sewage effluent illustrated moderate efficiency in removal of total nitrogen (TN) (68%) and superior performance in total phosphorus (TP) removal (99%). Comparison of seawater and SWRO concentrate as drawing agent were made in FO membrane separation of the microalgae. The result from this study depicts that SWRO concentrate is strong drawing agent in FO membrane system providing an average dewatering rate of $4.8L/(m^2{\cdot}hr)$ compared to seawater with average dewatering of $2.9L/(m^2{\cdot}hr)$. Results obtained from this study indicated that FO system could be viable option for harvesting the microalgae for further biodiesel production. SWRO concentrate as a drawing agent could be very important finding in field of membrane technology for disposal of SWRO concentrate.

• Prospectives of Industrial Chemistry
• /
• v.14 no.6
• /
• pp.9-20
• /
• 2011

전 세계는 물 부족 문제를 해결하기 위한 대체수자원 개발에 다양한 노력을 기울이고 있으며, 그 중에 해수 담수화 기술이 가장 주목받고 있다. 특히 역삼투 방식의 해수담수화기술은 기존 증발식에 비해 에너지 소비량이 적기 때문에 매년 10% 이상의 높은 성장률을 기록하고 있다. 그러나 역삼투 방식의 해수담수화는 지표수를 이용하는 시스템에 비해 상당히 많은 에너지를 필요로 한다. 따라서 에너지 효율을 높이기 위한 다양한 공정 개발이 시도되고 있으며, 그 중에 대표적인 기술이 삼투현상을 이용한 FO (Forward Osmosis)와 PRO (Pressure Retarded Osmosis) 공정이다. 본 논문에서는 역삼투막을 이용한 해수담수화 기술의 현황과 한계를 살펴보고, 현 해수담수화공정을 보완할 기술로써 FO와 PRO 공정개발에 관한 최근 연구 동향과 이러한 신기술의 상용화에 필수적으로 요구되는 막에 대한 개발 현황을 살펴보았다.

• Proceedings of the Membrane Society of Korea Conference
• /
• 2003.05a
• /
• pp.118-120
• /
• 2003

• Proceedings of the Membrane Society of Korea Conference
• /
• 2002.05a
• /
• pp.159-162
• /
• 2002

• 유체기계공업학회:학술대회논문집
• /
• 2005.12a
• /
• pp.431-433
• /
• 2005

• Proceedings of the Membrane Society of Korea Conference
• /
• 2002.11a
• /
• pp.162-165
• /
• 2002

• Proceedings of the Membrane Society of Korea Conference
• /
• 2003.11a
• /
• pp.58-60
• /
• 2003