• Title/Summary/Keyword: osmosis membrane

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Forward Osmosis Membrane to Treat Effluent from Anaerobic Fluidized Bed Bioreactor for Wastewater Reuse Applications (하수재이용을 위한 혐기성 유동상 생물반응기 처리수의 정삼투 여과막의 적용)

  • Kwon, Dae-eun;Kim, Jeonghwan
    • Membrane Journal
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    • v.28 no.3
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    • pp.196-204
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    • 2018

  • The anaerobic fluidized bed bioreactor (AFBR) treating synthetic wastewater to simulate domestic sewage was operated under GAC fluidization to provide high surface area for biofilm formation. Although the AFBR achieves excellent COD removal efficiency due to biological activities, concerns are still made with nutrient such as nitrogen remaining in the effluent produced by AFBR. In this study, forward osmosis membrane was applied to treat the effluent produced by AFBR to investigate removal efficiency of total nitrogen (TN) with respect to the draw solution (DS) such as NaCl and glucose. Permeability of FO membrane increased with increasing DS concentration. About 55% of TN removal efficiency was observed with the FO membrane using 1 M of NaCl of draw solution, but almost complete TN removal efficiency was achieved with 1 M of glucose of draw solution. During 24 h of filtration, there was no permeate flux decline with the FO membrane regardless of draw solution applied.

  • https://doi.org/10.14579/MEMBRANE_JOURNAL.2018.28.3.196 인용 PDF KSCI

Characteristics of $SiO_2$ Scale Removal by Chemical Cleaning in Reverse Osmosis Membrane Process (역삼투막 공정에서 화학적 세정에 의한 $SiO_2$ scale 제거특성)

  • DockKo, Seok;Lee, Hyung-Jib
    • Journal of Korean Society of Water and Wastewater
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    • v.24 no.1
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    • pp.93-101
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    • 2010

  • Reverse osmosis (RO) membranes have been widely used for desalination as well as water and wastewater treatment facilities. Cleaning process is important to maintain stable operation as well as prevention of membrane fouling. Purpose of this research is to analyze electrostatistic and chemical characteristics after cleaning of RO membrane against $SiO_2$ scale. Four RO membranes of polyamide are used and examined about effect of chemical cleaning. EDTA (ethylene diamine tetraacetic acid) and SDS (sodium dodecil sulfate) and NaOH are applied for cleaning process after operation in synthetic water. Then, cleaning was performed with chemicals such concentration as 6hr, 12hr and 24hr, respectively. As a result, transmittances of FT-IR of four membranes are compared at each cleaning concentration. Ta/Tv shows difference of chemical composition between new membrane and cleaning membrane after cleaning. Type B of RO membrane is turned out to be most vulnerable to cleaning among four membranes. In terms of zeta potential, new membrane has -16 mV to +6 mV on pH while scaled membrane has -18 mV to 2 mV. However, it changed -23mV to 0.9 mV after cleaning. In comparison with existing salt rejection of RO membranes after cleaning, the rejection of the membranes goes down 0.7% maximum. Though cleaning changes the characteristics of membrane surface, it does not greatly affect salt rejection. pH is a critical factor to flux change in PA (polyamide) membrane.

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Fabrication of Hydrophilic PEGDA Hydrogel-supported Forward Osmosis Membranes (친수성 PEGDA 하이드로젤 지지체 기반 FO 분리막의 제조)

  • Dal Yong Kim;Sung-Joon Park;Jung-Hyun Lee
    • Membrane Journal
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    • v.33 no.6
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    • pp.383-389
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    • 2023

  • A high-performance forward osmosis (FO) membrane was prepared using polyethylene glycol diacrylate (PEGDA) hydrogel as a support layer. Through the UV-induced polymerization and subsequent phase separation of PEGDA, the crosslinked, hydrophilic, and porous PEGDA suppor layer was obtained. To achieve high FO flux and salt selectivity using the fabricated PEGDA support, a selective layer was synthesized via the toluene-assisted interfacial polymerization (TIP), in which toluene is used as an organic solvent. The prepared PEGDA-based FO membrane showed higher FO water flux and lower salt selectivity compared with commercial HTI membranes using 1.0 M NaCl draw solution and DI water feed solution. We propose the strategy to fabricate high-performance FO membranes utilizing supports formed with new hydrophilic materials and fabrication processes.

  • https://doi.org/10.14579/MEMBRANE_JOURNAL.2023.33.6.383 인용 PDF