• Title/Summary/Keyword: Reverse Osmosis

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The Performance Evaluation of Blended Fertilizers as Draw Solution in Forward Osmosis Desalination (유도용액으로 혼합비료를 사용한 정삼투식 해수담수화에서 혼합비료의 성능평가)

  • Kim, Seung-Geon;Lee, Ho-Won
    • Membrane Journal
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    • v.28 no.1
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    • pp.45-54
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    • 2018

  • This study is to find the optimum draw solution in fertilizer-drawn forward osmosis desalination. Considering osmotic pressure, solubility, and pH, 20 blended fertilizers were screened. Their performance were evaluated in terms of pure water permeate flux, reverse solute flux, and specific reverse solute flux for nitrogen, phosphorus, and potassium. The pure water permeate flux of blended fertilizers including KCl were relatively higher. The reverse solute flux and specific reverse solute flux for nitrogen of blended fertilizers containing ${NO_3}^-$ ion were relatively higher than those of the nitrate ion-free draw solution. Those for phosphorus, and potassium of blended fertilizers including $NH_4H_2PO_4$, and $KNO_3$ were relatively higher than those of the phosphorus-free, and potassium-free draw solution, respectively. The blended fertilizer of $NH_4H_2PO_4$ and KCl contains all of nitrogen, phosphorus and potassium which are essential elements of fertilizer, and has the relatively high water permeation flux and the low reverse solute flux for nitrogen, phosphorus, and potassium. Therefore, it is the most effective draw solution for fertilizer-drawn forward osmosis desalination.

  • https://doi.org/10.14579/MEMBRANE_JOURNAL.2018.28.1.45 인용 PDF KSCI

Pilot-Scale Simulation of Desalination Process Using Water Integrated Forward Osmosis System (물통합형 정삼투 시스템을 이용한 파일럿 스케일 담수 공정 모사)

  • Kim, Bongchul;Hong, Seungkwan;Choi, Juneseok
    • Journal of Korean Society on Water Environment
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    • v.33 no.4
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    • pp.403-408
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    • 2017

  • In these days, wastewater reclamation and seawater desalination play essential role in addressing the challenge of worldwide water scarcity. Particularly, reverse osmosis (RO) for seawater desalination process is commonly used due to less energy consumption than conventional thermodynamic systems. However, membrane fouling and electrical energy consumption during operation of RO system for seawater desalination haver continued to be a obstruction to its application. In this study, therefore, wastewater secondary effluent is used for osmotic dilution of seawater. Firstly, fouling behaviour of RO by simulating wastewater effluent in osmotic dilution process was measured and we calculated energy consumption of overall desalination process by theoretical equations and commercial program. Our results reveal that RO membrane fouling can be efficiently controlled by pre-treatment systems such as nano filtration (NF) or forward osmosis (FO) process. Especially FO system for osmotic dilution process is a non-pressurized membrane system and, therefore, the operating energy consumption of overall desalination system was the lowest. Moreover, fouling layer on FO membrane is comparatively weak and reversible enough to be disrupted by physical cleaning. Thus, RO system with low salinity feed water through FO process is possible as a less energy consuming desalination system with efficient membrane fouling control.

  • https://doi.org/10.15681/KSWE.2017.33.4.403 인용 PDF KSCI