• 제목/요약/키워드: filtration

검색결과 3,354건 처리시간 0.027초

Salt Repellent Behavior of Superhydrophobic Filtration Membrane

  • 신봉수;김호영;이광렬;문명운
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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    • pp.236-236
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    • 2012
  • In this study, we present the salt repellent behavior of superhydrophobic filtration membrane. Bio-fouling or mineral-fouling is the main factor of decreasing the performance of filtration membrane. The superhydrophobic modification of filtration membrane using PECVD (Plasma enhanced chemical vapor deposition) is introduced. The oxygen plasma was introduced for developing nano hairy structures and subsequent HMDSO (Hexamethyldisiloxane) coating was used for enhancing low surface energy. Saline water evaporation test was carried out to evaluate the difference of contamination of salt on superhydrophobic and moderately hydrophobic filtration membrane. EDS and EPMA were used for visualizing the residue of salt crystal.

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동결융해 돼지정자의 수정능에 대한 Glass Wool여과법과 Swim-up법에 의한 정자 선별의 효과 (Effect of Sperm Selection by Glass Wool Filtration and Swim-up on the Fertilizing Capacity of Frozen-thawed Boar Sperm)

  • 박수봉;고대환;정진관
    • 한국수정란이식학회지
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    • 제7권2호
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    • pp.133-136
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    • 1992
  • Glass wool filtration and swim-up method resulted in inreasing to 58.3% and 62.7% of the progressive motility in frozen-thawed boar sperm, compared to 34.2% in the untreated sperm. Glass wool filtration tended to be more successful than swim-up method for the survival sfter incubation of 38.5$^{\circ}C$ for 3h. Sperm recovered by both the swim-up method and the glass wool filtration method were tested in an in vitro fertilization to determine which of the two techniques would yield sperm with high fertilizing capacity. The results indicated that there was a significantly(p

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강변여과수(충적층 및 하상) 열자원 활용 기술 개발 (Development of Technology on Water Thermal Energy Utilization of Riverbank(including Alluvial and Riverbed deposits) Filtration)

  • 김형수;서민우;정우성;송윤호
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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    • pp.591-594
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    • 2005
  • Geothermal energy becomes to be one of the promising energy sources. In this study, technology using water thermal energy from riverbank filtration system(including alluvial and riverbed deposit) is reviewed and checked as an energy resources. The objects of this study are (1) long-term monitoring of alluvial and riverbed sites, (2) preliminary design of cooling and heating system at riverbank filtration facility, and (3) calculation of potential groundwater heat energy, including riverbank filtration system. Measuring data of alluvial and riverbank filtration show slight fluctuations comparing to temperature of atmospheric air which indicates that groundwater obtained from the riverbank filtration system have a sufficient potential as a source of cooling and heating energy.

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한국형 IGCC 대용량 집진시스템 개발 (Development of Filtration System for Korean Model IGCC Demonstation Plant)

  • 박석주;임경수;임정환
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 춘계학술대회
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    • pp.812-815
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    • 2007
  • Computational simulation has been performed to design the filtration system for Korea model IGCC demonstration plant. The filtration system for optimal design has four effective filters corresponding to the clusters composed of a group of ceramic candle filters. It was analyzed how the different entrance geometry influences the flow field and the particle behavior in the filtration system. The particle loading is minimum when the gas mixed with particles flows into the filter vessel with a shroud tube through a tangential inlet. However, the particle loading is maximum when the gas with particles enters the filter vessel through a normal inlet which a entrance tube extended from. By controling adequately both conditions of inflow, the filtration system can be operated optimally to prolong the filter life-time and to save the energy for cleaning filters.

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강변여과에 의한 이.취미 물질 제어 특성에 관한 타당성 연구 (A Feasibility study on Removal Characteristics of Taste and Odor using Bank Filtration Treatment)

  • 맹승규;박노석;임재림;김성수;정우창
    • 상하수도학회지
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    • 제24권3호
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    • pp.307-317
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    • 2010
  • This study was conducted in order to investigate bulk organic matter characteristics and behavior of geosmin and 2-methylisoborneol (2-MIB) during riverbank filtration, which are general surrogates of taste and odor in drinking water. Column studies were used to simulate bank filtration systems. Most of the aliphatic organic matter was removed effectively after soil passage, and it is believed to be polysaccharides according to LC-OCD and F-EEM analysises. Removal efficiencies of geosmin and 2-MIB within the filtration column reached above 95%. It was found that the removal of total dissolved organic matter has a correlation with that of geosmin and 2-MIB in the near of filtration surface (about 50cm).

하수처리장 방류수를 이용한 인공함양 가능성 평가

  • 김병군;서인석;홍성택;김형수
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2002년도 추계학술발표회
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    • pp.257-260
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    • 2002
  • The main purpose of this research is to find suitable treatment methods of wastewater effluent for artificial recharge. For this purpose, we search the effluent quality of wastewater treatment plant and possibility of additional filtration process. Particles ranged 2 ~ 5 ${\mu}{\textrm}{m}$ and 15~20 ${\mu}{\textrm}{m}$ in "T" WWTP(Waste Water Treatment Plant) effluent were relatively dominant. In dual-media filtration system operation, head-loss development of column 1 was about two times faster than column 2, and head-loss development within 5 cm from surface was very important factor in operation, Conclusively, for the stable filtration and running time of 1.5~2 day, influent turbidity must keep 5 NTU or below, and filtration system must operated at 280 m/day or below. After filtration of WWTP effluent, water quality reached satisfactory level. This water has potential of agricultural reusing, flushing water in building, recharging water to river or stream at dry season and artificial recharge of ground water.und water.

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완속여과 공정에서 표층 생물막 생성 및 제어와 원인조류 규명 (Analysis and effectiveness of biological thin Layer (Schmutzdecke) on the sand surface in slow sand filtration processes)

  • 김성수;박노석;김충환;박종근
    • 상하수도학회지
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    • 제22권3호
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    • pp.289-298
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    • 2008
  • Because of their simplicity, efficiency, and economy, slow sand filters are appropriate means of water treatment for small water systems. Biological activity within the sand bed have the strongest influence on removal efficiency of pollutants by slow sand filtration. This report investigated the microorganisms(algae) of slow sand filtration pilot plant at Y water treatment plant. Data were collected at inflow and slow sand filtration from May to October, 2007. The results indicated that the light exposure was influenced on microorganism in slow sand filtration according to the formation of algal biofilm. The relative contribution of biomass and accumulated particulates to head loss development in slow sand filters requires further study.

고지 분말 첨가에 따른 제지 슬러지의 탈수성 개선에 관한 연구 (Study on the Improvement of Paper Sludge Dewatering by Adding Wastepaper Powders)

  • 이성호;임택준;조준형
    • 펄프종이기술
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    • 제34권2호
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    • pp.47-53
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    • 2002
  • Three types of sludges including printing paper, newsprint and tissue paper were prepared at 5% concentration for filtration-expression operations. Filtration-expression characteristics of sludge were measured in different pressure and wastepaper powder dosage. Specific filtration resistance and porosity were calculated with theoretical formula. Higher pressure increased the progresses of filtration and expression while it decreased porosity. The addition of 5% wastepaper powder more accelerated the progresses of filtration and expression than that of 10% wastepaper powder. The lowest porosity value was also measured at 5% dosage of wastepaper powder. The decrease of porosity implied the decrease of moisture content in cake. The results indicated that dewatering of sludge was efficient in high pressure and 5% dosage of wastepaper powder.

다순환 여과시험에 의한 자동차용 연료필터의 성능 평가 (Performance Evaluation of an Automotive Fuel Filter by Multi-Pass Filtration Test)

  • 이재천;장지현
    • 한국자동차공학회논문집
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    • 제10권6호
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    • pp.219-226
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    • 2002
  • Filtration performance of an automotive fuel filter was evaluated based on the theory of Beta ratio. This study also introduced the fuel components' contamination performance test stand incorporating the multi-pass filtration test circuit. The theoretical basis of multi-pass test and test procedure were described in detail. The specification of commercial fuel filter currently available was just the maximum pressure drop across the filter assembly and the holding capacity of contaminants. However, test results revealed that the fuel filter tested could not maintain consistent Beta ratio, that is filtration efficiency, although it had the holding capacity close to the specification. Hence the Beta ratio should be specified in service life. The results also showed that filtration system model should be refined including desorption ratio to estimate the variable Beta ratio in the test.

은나노 모래를 이용한 모래여과에서 유기물질 제거 및 소독 효과에 관한 연구 (A Study on the Removal of Organics and Disinfection Effect in Sand Filter Using Nano Silver Sand)

  • 선용호
    • KSBB Journal
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    • 제27권1호
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    • pp.16-20
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    • 2012
  • In this study, novel nano silver sand filtration method was compared with UV treatment and normal sand filtration method through filtering treated water from sewage treatment plant. As a result, $BOD_5$ removal rate of nano silver sand filtration showed higher approximately 31% and 23%, comparing with UV treatment and sand filtration. Moreover, $KMnO_4$ removal rate of nano silver sand was about 6.6 and 2.8 times higher than other two methods. In addition, it showed better for removing SS and total coliform, comparing with others. Also, there is no bacteria on nano silver sand after experiments. Therefore, nano silver sand filtration will be effective for advanced water treatment.