폴리에틸렌 모세관 막에 의한 Al2O3 현탁액의 정밀여과특성

남석태(Suk Tae Nam),한명진(Myeong Jin Han),김민(Min Kim) 한국공업화학회 2000 공업화학 Vol.11 No.8

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알루미나 현탁액에 의한 재생 셀루로오즈 막의 정밀여과 투과거동

남석태 ( Suk Tae Nam ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.3

This study investigated the permeation behavior of A1203 colloids on regenerated cellulose microfiltration membrane. To examine the effect of operation variation on permeation behavior, operating pressure was increased from 0.29 bar to 1.18 bar along with time and then was reduced to 0.29 bar reversely, Cross flow microfiltration module with the capillary PE membrane of nominal pore size of 0.20 and 0.45ion was used in the experiment. Fouling experiments were performed at 20t and at a constant flow rate of 24 L/hr. 200 and 1000 mg/L A1203 colloidal suspensions were prepared by mixing 1.0 and 0.61111 A1203 particles with pure water. The membrane permeate flux at the same operating pressure was dependent on the pressure control type, increasing and decreasing, a hysteresis behavior which is interpreted as an irreversible compression of the cake deposited on the membrane, Cake resistance was measured as a function of the trans membrane pressure in the permeation. And flux decline caused by compaction was observed in the increasing pressure cycle. Permeate resistance and its rate of increase was higher in the decreasing pressure cycle than in the increasing pressure cycle because of the cake deposited on the membrane during the pressure increasing stage, For the membrane with 0.4511n pore size, the resistance increased slowly than that with 0.20/Ill. Permeate resistance of the suspension with 1 .0/all Al203 particles was less than that of the 0.6/In A1203 particles. Flux decline for the both cycles was governed by the cake filtration and the pressure reduction did not decrease the cake thickness.

정밀여과 모세관 막을 이용한 Al2O3 콜로이드 현탁액의 투과유속 감소특성

남석태(Suk Tae Nam),한명진(Myeong Jin Han),김민(Min Kim) 한국공업화학회 2002 공업화학 Vol.13 No.6

폴리에틸렌 정밀여과 모세관막을 이용한 Al_2O_3 콜로이드 현탁액의 투과유속 감소특성을 검토하였다. 운전시간이 경과하면서 투과유속이 감소되는 원인은 막표면 위에서 케익층의 성장과 입자들에 의한 세공막힘 때문이었으며, 운전시간이 오래 경과하여 정상상태에 도달하면 투과유속은 케익여과 모델에 의해 지배받는다. 세공의 크기가 0.34 ㎛인 막의 투과유속 감소는 세공의 크기가 0.24㎛ 막보다 작았으며, 막오염의 형태는 운전초기에 세공막힘이 나타난 케익여과 형태가 지배적이었다. 입자의 크기가 0.6㎛인 Al_2O_3 콜로이드 용액의 투과유속은 크기가 1.0 ㎛인 콜로이드 용액보다 작았고, 정상상태에 도달하는 시간도 빨랐다. 운전압력이 높은 경우의 투과유속 감소는 세공막힘과 케익층이 치밀해졌기 때문이다. 흐름속도를 12 L/h에서 24 L/h로 증가하였을 때 입자의 크기가 0.6 ㎛인 용액의 투과유속은 17% 증가하였고, 투과거동은 초기에는 케익여과 형태가 지배적이었으며 이어서 세공막힘이 나타났다. 입자크기가 0.6 ㎛인 것과 1.0 ㎛인 것을 혼합한 용액의 투과유속 감소는 1.0 ㎛ 단독으로 존재하는 용액보다 컸다. Permeate flux decline in a microfiltration was analyzed by measuring the permeability of Al_2O_3 colloidal solution through polyethylene capillary membranes. The flux decline was due to the growth of cake layer on the membrane surface and to the pore blocking by particles. When a steady state is approached, the permeate flux was ultimately controlled by the cake filtration model. For the membrane with 0.34 ㎛ pore size, the decline was slower than that with 0.24 ㎛, and the dominant fouling model was seemed to be cake filtration following pore plugging at the initial stage. Permeate flux for the colloidal suspension of 0.6 ㎛ Al_2O_3 particles was less than that of the 1.0 ㎛ Al_2O_3 particles, and the approach to the steady state was fast. At high transmembrane pressure, the flux decline was fast attributing to the formation of denser packed cake layer and pore blocking. With increasing the feed flow rate from 12 L/h to 24 L/h, the permeate flux increased 17% for the colloidal suspension of 0.6 ㎛ particles. The cake filtration model was dominant at the initial period of filtration, however, the filtration followed pore-blocking model as time progressed. The initial flux decline was greater with the mixture of 0.6 ㎛ and 1.0 ㎛ Al_2O_3 particles than with 1.0 ㎛ particles alone in the solution.

재생 셀룰로오스 정밀여과막 공정에 있어 막배향에 따른 알루미나 현탁액의 투과거동

남석태 ( Suk Tae Nam ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.1

This study examined the effect of membrane orientation on permeation behavior in microfiltration by measuring the flux of Al2O3 colloidal suspensions through the cross flow microfiltration. The membranes used for experiments are regenerated cellulosic membrane. The permeate flux of front side orientation (mode of active layer facing colloid solution) was smaller than that of back side orientation (mode of support layer facing colloid solution). This behavior is probably mainly caused by the truncated conical pore shape of asymmetric membrane. The flux decline was due to the membrane fouling such as cake formation on the membrane surface and pore blockings by particles. The fouling mechanism was dominantly governed by cake filtration combined with pore blocking. At the range of operating pressure between 0.29 and 1.18 bar with 200 mg/L suspension, the water permeate flux through 0.2 μm membrane was about 70% of the flux through 0.45 μm membrane. The water permeate flux was more affected by variation of operating pressure with the front side orientation compared to with the back side orientation. With the fouling resistance calculated by a regression method of relative flux, the ratio of total membrane fouling for the front side orientation to that for back side orientation was 1.83 times at 0.29 bar of operating pressure, 1.91 times at 0.58 bar, and 1.11 times at 1.88 bar. At the front side orientation of operating pressure 1.18 bar, the total fouling was composed of 14.1% of complete pore blocking, 9.1% of standard pore blocking, and 76.8% of cake formation, For each fouling mechanisms, the front side orientation resulted in higher values compared to the back side orientation.

운전압력의 순환변화에 따른 알루미나 현탁액의 정밀여과 오염특성

남석태 ( Suk Tae Nam ),한명진 ( Myeong Jin Han ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.1

This study investigated the fouling behavior of mirofiltration polyethylene (PE) membrane under the cyclic variations of transmembrane pressure(TMP). Al2O3 colloid suspensions was used as feed water. To examine the effect of operation variation on fouling, operating pressure was increased from 0.5kgt/cm2 to 2.0kgt/cm2 along with time elapses and then was reduced to 0.5 kgt/cm2 reversely. Cross flow microfiltration module with the capillary PE membrane of nominal pore size of 0.24 and 0.34um was used in the experiment. Fouling experiments were performed at 20℃ and at a constant flow rate of 12L/hr. 200 and 1000 ppm Al2O3 colloidal suspensions were prepared by mixing 1.0 and 0.6tm1 AI203 particles with pure water. Hysteresis was observed in the permeate flux over each pressure variation cycle. The permeate resistance and its rate of increase was higher in the backward pressure cylces than in the forward pressure cycles. At the initial period of filtration. fouling mechanism for the both cycles was governed by the cake filtration. The degree of fouling was higher in the backward pressure cycles compared with in the forward pressure cycles. and the ratio of cake filtration to the total fouling was higher than that of pore blocking. The ratio of component fouling was higher in the backward operation compared to in the forward cycles. Under the forward pressure cycle of 0.5kgtlcm2, the relative contributions of fouling mechanisms to the overall fouling were 15.8% for complete blocking. about 9.8% for cake filtration and 74.4% for cake filtration.

환외여과에 있어서 Si 콜로이드 용액의 투과유속 감소 및 오염특성

남석태(Suk-Tae Nam   &),전재홍  (Jae-Hong Jeon   ),이석기(Seok-Ki Lee),최호상    (Ho-Sang Choi) 한국청정기술학회 1999 청정기술 Vol.5 No.2

고분자용액의 물성이 수면전개 박막의 두께에 미치는 영향

남석태,한명진,최호상,박영태 ( Suk Tae Nam,Myeong Jin Han,Ho Sang Choi,Young Tae Park ) 한국공업화학회 1998 공업화학 Vol.9 No.2

수면전개법에 의해 제조된 박막의 두께에 대한 고분자용액의 표면장력과 검도의 영향을 검토하였다. 수면에서 고분자용액의 전개는 고분자용액의 표면장력과 점도에 의해 지배되며, 수면전개 박막의 두께도 이들 인자의 영향을 받는다. 고분자의 농도가 증가함에 따라 고분자용액의 표면장력과 점도는 증가하였으며, 표면장력의 크기는 PVC>PS>CA이였고, 점도의 크기는 CA>PS>PVC였다. 고분자용액의 수면전개시 물과 고분자용액의 표면장력의 차는 전개구동력으로 작용하나 고분자용액의 표면장력과 점도는 전개저항으로 작용하였다. 수면전개 박막의 두께에 대한 고분자용액의 점도영향이 표면장력에 의한 영향 보다도 더 컸으며, 수면 전개 박막의 두께는 PS>CA>PVC 순으로 두꺼웠다. The effect of surface tension and viscosity of polymer solution on the thickness of water casting membranes was studied. Spreading of polymer solutions on water surface was governed by the surface tension and viscosity of the polymer solution. Thethickness of water casting membrane was affected by these two factors. The properties, motioned above, were proportional to the polymer concentration. The order of magnitude in surface tension was PVC > PS > CA and that of viscosity was CA > PS > PVC. The difference of surface tension between water and polymer solution acts as driving force for spreading of polymer solution, but the viscosity as resistance. The thickness of polymeric membrane prepared by water casting was PS > CA > PVC. The order of membrane thickness was not as same as that of surface tension. This phenomena were due to the viscosity which acts as more effective spreading resistance than the surface tension.

Vapor Exposure Effect of a Casting Solution on the Embedding and Radioactive Detection of CAYS in Double-layered Polysulffne Film

한명진,남석태,이근우,서범경,Han Myeong-Jin,Nam Suk-Tae,Lee Kune-Woo,Seo Bum-Kyoung The Membrane Society of Korea 2005 멤브레인 Vol.15 No.3

방사능 오염도 측정에 사용하기 위한 이중구조 고분자막이 폴리설폰과 세륨활성화된 이트륨실리케이트(CAYS)를 이용하여 제조되었다. 제조된 막은 순수 고밀도 고분자 지지층과 이에 제막된 고분자 용액의 상전환 공정에 의해 고형화된 CAYS 함침 활성층의 이중구조로 구성된다. 제막공정에서 대기방치 공정이 생략되었을 때 CAYS를 포함하는 활성층은 전형적인 비대칭 구조를 지니며, CAYS 입자들이 고분자 구조 사이에 박혀있는 형상을 지닌다. 제막공정에서 대기에 방치하는 시간이 증가할수록 막의 형상은 스폰지 구조를 띠며 CAYS는 고분자 구조로부터 분리되어 막 내부에 셀 같은 공간에 밀집되어 존재함을 보였다. 한편, 두 충 사의 계면형상은 고분자 고형화 과정에서의 상전환 속도와 밀접한 관련되었으며, 대기방치 시간의 증가에 따라 계면의 구분이 뚜렷하게 나타나지 않았다. 방사능 탐지 특성에서 스폰지 구조를 지니는 막의 고분자 구조는 방사성핵종이 통과할 수 없는 밀집된 형상을 지니면서 탐지효율의 감소를 초래하는 것으로 나타났다. Double-layered polymer films to assay the radioactive contamination were formulated using polysulfone (PSF) and cerium activated yttrium silicate (CAYS), consisting of a dense support layer and a CAYS-holding top layer prepared via the diffusion-induced phase inversion. As the vapor exposure process was omitted, the CAYS-holding layer showed a typical asymmetric structure, with CAYS being transfixed into the polymer network spread with large macropores. With the increase in vapor exposure time before immersion, morphology of the films transformed from asymmetric to sponge-like structures, with CAYS being localized in cellular structure. The border structure between the two layers reflects the phase inversion behavior of a cast solution during the coagulation. In the radioactive detection, the polymer phase in a film holding a sponge-like structure is so dense that the radionuclides, deposited on the film, could not filter through the phase, consequently resulting in the loss in the detection efficiency of the film.

응고화 경로가 고분자막 및 함침 약제 형상 변화에 미치는 영향의 분석

한명진(Myeong Jin Han),남석태(Suk Tae Nam),이재훈(Jae Hoon Lee) 한국고분자학회 2001 폴리머 Vol.25 No.2

무기 Fluor 하침 Polysulfone 고체막 제조에 관한 연구

한명진(Myeong Jin Han),남석태(Suk Tae Nam),이수각(Soo Kag Lee),최호상(Ho Sang Choi),박영태(Young Tae Park) 한국고분자학회 1997 폴리머 Vol.21 No.3