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막증류 공정에서 원수 조성에 따른 막오염과 막젖음 연구
손광표 ( Kwang Pyo Son ),임주완 ( Joowan Lim ),강승모 ( Seungmo Kang ),이호성 ( Hosung Lee ),채도원 ( Dowon Chae ),박병규 ( Pyung-kyu Park ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Membrane distillation (MD) is a thermally driven desalination process separating concentrates from liquid mixture by permeating water vapor through macro-porous hydrophobic membranes based on its volatility. The driving force of this process is the vapor pressure difference triggered by a temperature difference. MD technology has been emerging for next-generation desalination because of its positive benefits such as low production of brine compared to RO technology. However, like other membrane filtration processes, it also suffers from membrane fouling, which leads to flux decline. In addition, it undergoes wetting phenomena causing serious decrease in salt rejection. In this study, we investigated membrane fouling and wetting tendency due to the presence of inorganic and/or organic compounds such as humic acid (HA), ozonated HA, calcium, and magnesium in feed water. In particular, the effect of ozonated HA with different degrees of its hydrophilicity on fouling and wetting was studied by adjusting ozonation time. The tests were conducted using a lab-scale direct contact membrane distillation (DCMD) system. Membrane permeability and salt rejection were measured during operation. After filtration, the liquid entry pressure (LEP) of membranes were measured to find out how much membranes got wetted. Fouling layers on the membrane surface were analyzed by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). Due to the wetting, LEP decreased from 220 kPa of a virgin membrane to 50 kPa after filtration. Inorganic (Ca, Mg 2000 ppm) or organic (HA 50 or 100 ppm) compounds were individually added to the feed solution (sodium chloride 50000 ppm). In the case of calcium and magnesium, the result was not significantly changed. However, in the case of HA, the permeate flux decreased almost 40%. Meanwhile, HA did not show membrane wetting whereas ozonated HA accelerated membrane wetting which increased conductivity in the permeate.
막증류 공정에서 원수 조성에 따른 막오염과 막젖음 연구
손광표 ( Kwang Pyo Son ),임주완 ( Joowan Lim ),강승모 ( Seungmo Kang ),이호성 ( Hosung Lee ),채도원 ( Dowon Chae ),박병규 ( Pyung-kyu Park ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Membrane distillation (MD) is a thermally driven desalination process separating concentrates from liquid mixture by permeating water vapor through macro-porous hydrophobic membranes based on its volatility. The driving force of this process is the vapor pressure difference triggered by a temperature difference. MD technology has been emerging for next-generation desalination because of its positive benefits such as low production of brine compared to RO technology. However, like other membrane filtration processes, it also suffers from membrane fouling, which leads to flux decline. In addition, it undergoes wetting phenomena causing serious decrease in salt rejection. In this study, we investigated membrane fouling and wetting tendency due to the presence of inorganic and/or organic compounds such as humic acid (HA), ozonated HA, calcium, and magnesium in feed water. In particular, the effect of ozonated HA with different degrees of its hydrophilicity on fouling and wetting was studied by adjusting ozonation time. The tests were conducted using a lab-scale direct contact membrane distillation (DCMD) system. Membrane permeability and salt rejection were measured during operation. After filtration, the liquid entry pressure (LEP) of membranes were measured to find out how much membranes got wetted. Fouling layers on the membrane surface were analyzed by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). Due to the wetting, LEP decreased from 220 kPa of a virgin membrane to 50 kPa after filtration. Inorganic (Ca, Mg 2000 ppm) or organic (HA 50 or 100 ppm) compounds were individually added to the feed solution (sodium chloride 50000 ppm). In the case of calcium and magnesium, the result was not significantly changed. However, in the case of HA, the permeate flux decreased almost 40%. Meanwhile, HA did not show membrane wetting whereas ozonated HA accelerated membrane wetting which increased conductivity in the permeate.