• Title, Summary, Keyword: membrane filter

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Effects of Membrane Filter and Sucrose Concentrations on the Growth of Balloon Flower (Platycodon grandiflorum A. DC.) Plantlets In Vitro (Membrane Filter와 Sucrose 농도가 도라지(Platycodon grandiflorum A. DC.) 기내 배양묘의 생장에 미치는 영향)

  • Choi, So-Ra;Kim, Myung-Jun;Eun, Jong-Seon;Ahn, Min-Sil;Lim, Hoi-Chun;Ryu, Jeong;You, Dong-Hyun
    • Journal of Plant Biotechnology
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    • v.31 no.3
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    • pp.209-217
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    • 2004
  • The shoots of balloon flower (Platycodon grandiflorum A. DC.) in vitro germinated from seeds were cultured on MS basal medium containing 0.1 mg/L NAA under the various sucrose concentrations and with/without membrane filter (MF) on the lid of vessel. The growth responses were checked to obtain healthy plantlets. The $CO_2$ and $C_2$H$_4$ concentration in vessel without MF were higher than those with MF. The $CO_2$ concentration without MF was increased as days in culture went by whereas the $C_2$H$_4$ concentration was decreased. The plant growth with MF and high sucrose concentration was good. Fresh and dry weight of plantlets cultured in sucrose 4.5% with MF were higher than those in no sucrose without MF. Also the content of chlorophyll of plantlets cultured with MF was high and the content of sugar was shown a similar results and a remarkable difference between MF treatments, especially. Stomata cultured with MF was closer than that without MF and mesophyll of leaf were more developed with MF or in high sucrose concentration. When the plantlets were transplanted in the pot at 25$\pm$2$^{\circ}C$, 75% relative humidity and low PPFD (photosynthetic photon flux density), the percentage of survival after 13 days without MF was 0% but it was 100% with MF regardless of sucrose concentrations.

A study on characteristics of filters for domestic household water purifier (국내 가정용 정수기 필터의 특성 분석에 관한 연구)

  • Cho, Jae-Ik;Kim, Gil-Tae;Ahn, Young-Chull
    • Journal of the Korean Society of Marine Engineering
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    • v.37 no.5
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    • pp.541-547
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    • 2013
  • It is important to establish water treatment technologies for drinking water because Korea belongs to water-stressed country. Leachate from recent incident of foot-and-mouth disease has become an opportunity to be aware of the need to manage water quality. Water purifiers are adopted to four or five steps of filtration process. Each steps are composed of a sediment filter, a pre-carbon filter, an UF or a RO membrane filter and a post-carbon filter. And additionally a ceramic filter can be used as a final stage. In this study, operational conditions in each steps are examined and characteristics of each filters are investigated. SEM analysis is used for filter surface and shape investigation using 6 commercial samples. Pore sizes of the sediment filter, the UF membrane filter, and the RO membrane filter are 30~47 ${\mu}m$, 0.005~0.5 ${\mu}m$, and 0.025~0.25 ${\mu}m$, respectively. Specific surface areas of activated carbons are ranged from 622 to 1,308 $m^2/g$.

A Study on Polynuclear Aromatic Hydrocarbons Emitted by Coking Time and Sampling Method in a Coke Oven Plant (코크스제조공정에서 탄화시간과 시료채취방법에 따른 다핵방향족탄화수소 발생에 관한 연구)

  • Yun, Chung Sik;Paik, Nam Won
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.3 no.1
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    • pp.37-53
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    • 1993
  • The polynuclear hydrocarbons (PAHs) emitted from coke oven standpipe were sampled using three sampling systems, including glass fiber filter+silver membrane filter, glass fiber filter+silver membrane filter+XAD-2 adsorbent tube, PTFE membrane filter+XAD-2 adsorbent tube, extracted by methylene chloride and analysed by gas chromathography using flame ionization detector. The results of this study were as follows. 1. Because the amounts of coke oven emissions(COE) were large, the analyses of PAHs were simple and possible without evaporation and concentration. Although the generation of COE was high during early stage of coking, the airborne concentration of PAHs was low and increased during late coking. 2. The contents of PAHs in COE were 1.35-2.81%. 3. The index components of PAHs were fluoranthene and pyrene. Their correlation coefficient to total PAHs were 0.96, 0.95, respectively. 4. The particulate PAHs were sampled by filter and gaseous PAHs by adsorbent tube. The collection efficiency of glass fiber filter+silver membrane filter was 20% of total amount sampled by filters+adsorbent and PTFE membrane filter 50%. Adsorbent tube must be attached to the filter to collect light and small PAH components. 5. The generation of acenaphthene and indeno (1,2,3-cd) pyrene were low and concentrations of fluorene and anthracene were $20-40ug/m^3$ throughout coking time. Other PAH eoncentrations were sometimes high. The generation of PAHs was low at 4-6 hours of coking time. The gaseous PAHs were generated earlier than particulate PAHs.

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Optimal Immobilization of Penicillinase for Ion-selective Electrode

  • Hur, Moon-Hye;Kang, Hee-Jin;Min, Hye-Young;Lee, Ji-Yeun;Lee, Ki-Hyun;Ahn, Moon-Kyu
    • Archives of Pharmacal Research
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    • v.20 no.1
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    • pp.68-71
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    • 1997
  • Penicillin sensor was prepared by immobilizing penicillinase (Pcase) on $H^{+}$-selective carboxylated poly (vinyl chloride) (PVC-COOH) membrane or cellulose filter membrane. The immobilization techniques are as follows. Pcase was immobilized with GTH on $H^{+}$-selective PVC-COOH membrane or some amount of BSA was dropped on that membrane. Another method to make immobilization is to mix type I Pcase with GTH and drop on a cellulose filter membrane. According to immobilization techniques, there were some differences in response properties of enzyme electrodes, however, all electrodes responded to Pcase-resistant penicillin derivatives. Pcase immobilized on cellulose filter membrane with $H^{+}$-selective PVC membrane eletrode was more stable and more sensitive to penicillinase-resistant penicillin derivatives than any other immobilization techniques.

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The Influence of Various Factors upon the Membrane Filter Technique on Raw Water of the Nak-Dong River (낙동강 원수에 대한 대장균군 막여과시험법에 있어서 여러 인자가 결과에 미치는 영향)

  • Hyun, Jae-Yeoul;Yoon, Jong-Ho;Shin, Sang-Hee;Kim, Jong-Woo
    • Journal of Korean Society on Water Environment
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    • v.25 no.2
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    • pp.205-211
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    • 2009
  • In this study, the membrane filter method was compared to the MPN method for the analysis of total coliforms from raw water using raw test waters and controls including 6 standard strains of coliforms, and the various factors were analyzed on the detection of general and fecal origin coliforms. The range of error rate for the detection of 5 standard strains using the membrane filter and the MPN methods was 0 to 6% and 45 to 133%, respectively. The error rate of the membrane filter method was lower than that of the MPN method. The membrane filter method (m-Endo) showed 10% (11 out of 111) of difference for the detection sensitivity of coliforms isolated from raw water compared to the MPN method (BGLB). The membrane filter method was less affected by the factors including temperature, turbidity, charcoals of powder form, contamination, and reverse pressure. In conclusion, the membrane filter method is a better method for the analysis of total coliforms from raw water than the MPN method, considering the accuracy of detection and the tolerance to various experimental factors.

Advanced Wastewater Treatment using Bioreactor Combined with Alternative Membrane (하수의 고도처리를 위한 저비용 저에너지의 대체 막을 조합한 생물반응기의 개발)

  • Kim, Dong-Ha
    • Journal of Korean Society of Water and Wastewater
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    • v.19 no.1
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    • pp.25-30
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    • 2005
  • In order to decrease the high costs of membrane process, we have tried to develop two alternatives to membrane; a cartridge type filter and a metal membrane were tested for the high permeation flux with low cost and low energy. This research mainly focused on three points; 1) operation with high permeation flux by using of a cartridge type filter and a metal membrane, 2) removals of the filterable organic materials (FOC) by pretreatments for the membrane fouling control, and 3) advanced wastewater treatment by SMBR process with intermittent aeration and high MLSS. An Intermittently aerated membrane bioreactor using a submerged micro filter (cartridge type) was applied in laboratory scale for the advanced wastewater treatment. To minimize membrane fouling, intermittent aeration was applied inside of the filter with $3.0kg_f/cm^2$. The experiments was conducted for 6 months with three different HRTs (8, 10, 12 hr) and high MLSS of 6,000 and 10,000mg/L. The filtration process could be operated up to 50 days with permeation flux of 500LMH. Regardless of the operating conditions, more than 95% of COD, BOD and SS were removed. Fast and complete nitrification was accomplished, and denitrification was appeared to be the rate-limiting step. More than 75% T-N could be removed due to the endogenous denitrification. T-P removal efficiency was increased to 80% under the condition of MLSS 10,000mg/L.

막분리공정을 이용한 용수처리

  • 김해수
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.83-95
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    • 1993
  • 현재 존재하는 다양한 filtration 테크놀러지는 feed stream으로부터 제거되는 파티클의 사이즈에 근거하여 그 범주를 정할 수 있다. 부유 고체물의 재래식 macrofiltration 은 feed solution이 수직 방향으로 filter media을 통하여 흐르게끔 하는 것이다. 전체 용액은 메디아를 통하여 지나가는데 단지 한개의 stream만 만든다. 그런 여과 장채의 보기를 들면, cartridge, filter, bag filter, sand filter, multimedia filter들이 있다. Macrofiltration separation은 1 미크론 이상가는 비용해성 파티클에 국한된다.

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Localization Development of PTFE Membrane Filter for Simultaneous Removal of Fine Particle and Heavy Metal(Hg) (미세먼지 및 미량 중금속(Hg) 동시 제거용 PTFE membrane filter 국산화 개발)

  • Hwang, Sang Yeon;Lee, Chi Won;Lee, Seung Woo
    • Journal of Korea Society of Waste Management
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    • v.35 no.6
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    • pp.541-552
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    • 2018
  • Polluting gases emitted from industrial sites take compound forms consisting of gaseous and particulate phases. Localization of PTFE membrane filters has thus been initiated to remove particulate materials and mercury, which is a heavy and hazardous metallic element. More specifically, a PTFE membrane filter was fabricated by thermal laminating technology to vary porosity on the filter surface for removal of particulate materials thereon. Optimized equi-biaxial stretching ratio control enables minimization of large-size pore formation with an average pore size of $0.58{\mu}m$ and improved air permeability of $8.03cm^3/cm^2/sec$. Various adsorbents were tested for removal of mercury vapor by surface treatment of the PTFE membrane filter. The filter's surface was further altered using functional amine group compounds: one composed of silane coupling agent (APTMS) was found suitable as a mercury adsorbent. When ACF with a large surface area was used as support material, mercury removal efficiency increased threefold to 0.162 mg/g-ACF. Furthermore, the developed PTFE membrane filter was tested in its capacity of differential pressure and filtering efficiency using a pilot scale particulate removal unit. Stable and consistent differential pressure was maintained during long-term operation and less frequent periods of filter shutdown due to pores filling with 99.96% of particulate removal efficiency, which was more than satisfactory filtration efficiency.

Development of Membrane Filters with Nanostructured Porous Layer by Coating of Metal Nanoparticles Sintered onto a Micro-Filter (마이크로-필터 상에 소결 처리된 금속 나노입자 코팅에 의한 나노구조 기공층 멤브레인 필터 개발)

  • Lee, Dong-Geun;Park, Seok-Joo;Park, Young-Ok;Ryu, Jeong-In
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.8
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    • pp.617-623
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    • 2008
  • The membrane filter adhered with nanostructured porous layer was made by heat treatment after deposition of nanoparticle-agglomerates sintered in aerosol phase onto a conventional micron-fibrous metal filter as a substrate filter. The Sintered-Nanoparticle-Agglomerates-coated NanoStructured porous layer Membrane Filter (SNA-NSMF), whose the filtration performance was improved compared with the conventional metal membrane filters, was developed by adhesion of nanoparticle-agglomerates of dendrite structure sintered onto the micron-fibrous metal filter. The size of nanoparticle-agglomerates of dendrite structure decreased with increasing the sintering temperature because nanoparticle-agglomerates shrank. When shrinking nanoparticle-agglomerates were deposited and treated with heat onto the conventional micron-fibrous metal filter, pore size of nanostructured porous layer decreased. Therefore, pressure drops of SNA-NSMFs increased from 0.3 to 0.516 kPa and filtration efficiencies remarkably increased from 95.612 to 99.9993%.

Development of Membrane Filter with Nanostructured Porous Layer by Coating Metal Nanoparticles onto a Micor-Filter (마이크로-필터 상에 금속 나노입자 코팅에 의한 나노구조 기공층 멤브레인 필터 개발)

  • Lee, Dong Geun;Park, Seok Joo;Park, Young Ok;Ryu, Jeong In
    • Korean Chemical Engineering Research
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    • v.45 no.6
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    • pp.591-595
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    • 2007
  • The membrane filter coated with nanostructured porous surface layer was made by heat treatment after depositing nanoparticles onto a conventional micron-fibrous metal filter as a substrate filter. The nanostructured porous layer membrane filter (NSPL-MF), whose the filtration performance was improved compared with the conventional metal membrane filters, was developed by coating the nanoparticle agglomerates of dendrite structure onto the micron-fibrous metal filter. Pressure drop of nanostructured porous layer membrane filter decreased with increasing the heat treatment temperature to make the nanostructured porous layer adhered on the filter surface because the nanoparticle agglomerates shrank, but filtration efficiency did not decrease clearly.