• Title, Summary, Keyword: filter media

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Structure and Filter Characteristics of Nonwoven Air-Filter Media (부직포형 기체 여과재의 구조와 여과 특성)

  • Lee, Jin-Ah;Joo, Chang-Whan
    • Textile Science and Engineering
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    • v.47 no.2
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    • pp.133-140
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    • 2010
  • Various air-filter media by using meltblown (MB) and spunbond (SB) nonwovens were structurally designed with different laying methods to obtain the relationship between structure and characteristic of air filters. Air permeability, pore size, filter efficiency and pressure drop of the designed filter media were investigated experimentally. The layer sequences of designed media showed significant factor on filter efficiency and pressure drop. The optimum filter media was determined as two layer structural design composed of calendering SB and MB nonwovens. In addition, a model equation to predict the pressure drop and filter efficiency of air filter media based on nonwovens was developed. The calculated values from the equation showed good agreement with experimental ones.

Characterization of depth filter media for gas turbine intake air cleaning

  • Park, Young Ok;Hasolli, Naim;Choi, Ho Kyung;Rhee, Young Woo
    • Particle and aerosol research
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    • v.5 no.4
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    • pp.159-170
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    • 2009
  • A depth filter medium was newly designed in order to achieve high collection of dust and low pressure drop in this work. Multilayer depth filter media consist of an upstream layer of highly porous structure which allows particles to pass through and to follow by one or more downstream layers to hold the particles inside the media. For each filter media, flat sheet and pleated module were made of newly developed depth filter media and filter media of commercial products. Commercial depth filter cartridge for gas turbine air intake cleaning were used as reference for filtration area and pleat geometry of pleated modules. This work attempts to evaluate and compare the newly developed depth filter medium and two commercial filter media in terms of filtration parameters such as air permeability, initial pressure drop, particle retention and pressure drop variation with dust loading. According to the close examination the newly developed depth filter showed better performance compared to the commercial depth filter media.

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The adaptive filter configuration for down stream of Naktong river (낙동강 하류원수에 적합한 여과지의 여재구성)

  • 김상구;류동춘
    • Journal of Environmental Science International
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    • v.4 no.5
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    • pp.481-488
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    • 1995
  • This study was carried out to evaluate the variations of headloss rate and of specific deposit to depths with effective size of media and configuration of filter layer during algae blooming period. 0.51mm size media was disqualified because most of headloss occurred rapidly below 5cm from surface layer however 0.91mm size media acted deep filtration more than 20cm from top, as result 0.91mm sixte media filter had 2~3 times longer filtration time than 0.51mm sixte media filter, but 0.91mm size media have break-through potentiality. multi-layer filter with 1.02mm anthracite and 0.51mm sand had large deposit volume in upper layer that could longer filtration time, moreover smaller media in lower layer that could protect break-through.

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Soluble Manganese Removal Using Manganese Oxide Coated Media (MOCM) (산화망간피복여재를 이용한 용존망간 제거)

  • Kim, Jinkeun;Jeong, Sechae;Ko, Suhyun
    • Journal of Korean Society of Water and Wastewater
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    • v.20 no.6
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    • pp.813-822
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    • 2006
  • Soluble manganese removal was analyzed as a function of filter media, filter depth, presence or absence of chlorination, and surface manganese oxide concentration in water treatment processes. Sand, manganese oxide coated sand (MOCS), sand+MOCS, and granular activated carbon(GAC) were used as filter media. Manganese removal, surface manganese oxide concentration, turbidity removal, and regeneration of MOCS in various filter media were investigated. Results indicated that soluble manganese removal in MOCS was rapid and efficient, and most of the removal happened at the top of the filter. When filter influent (residual chlorine 1.0mg/L) with an average manganese concentration of 0.204mg/L was fed through a filter column, the sand+MOCS and MOCS columns can remove 98.9% and 99.2% of manganese respectively on an annual basis. On the other hand, manganese removal in sand and the GAC column was minimal during the initial stage of filtration, but after 8 months of filter run they removed 99% and 35% of manganese, respectively. Sand turned into MOCS after a certain period of filtration, while GAC did not. In MOCS, the manganese adsorption rate on the filter media was inversely proportional to the filter depth, while the density of media was proportional to the filter depth.

Comparison of the filtration performance by different media in pretreatment of seawater desalination by reverse osmosis (여재 종류에 따른 역삼투법 해수담수화 시설 전처리 여과공정의 성능비교)

  • Kim, Seung-Hyun;Yoon, Jong-Sup;Lee, Seockheon
    • Journal of Korean Society of Water and Wastewater
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    • v.23 no.2
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    • pp.215-222
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    • 2009
  • This study compares the performance of the filters with various media in pretreatment of seawater desalination by reverse osmosis. For this purpose, Masan bay seawater is used as raw water. The filter performance is evaluated by the filtrate quality and the head loss development. Five media is selected in this study: anthracite, $Filtralite^{(R)}$, sand, Pumice, $AFM^{(R)}$. These media are used in combination for dual media filter and alone for mono media filter. The comparison results show that NC0.8-1.6 is the best $Filtralite^{(R)}$. The dual media filter of NC0.8-1.6 and sand outperformed other filters in particle removal. The dual media filter of anthracite and sand showed good performance in organic removal. The mono media filter of Pumice produced the similar filtrate quality as the mono media filter of sand although the effective size of Pumice is considerably greater than that of sand. Due to big size, head loss development is maintained slow in the filtration of Pumice.

A Study on the Filter Media and Performance of Intake Air Filter for Vehicular Engine (자동차 흡기 에어필터의 여재 및 성능에 관한 연구)

  • 안병찬;오명도
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.1
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    • pp.8-15
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    • 2004
  • Since the vehicle is regarded as the third living space, the comfortable conditions are required in the passenger compartment. For this reason, customers are concerned about the filtering performances and the importance of filter media has been greatly placed. Therefore the dust holding capacity, the efficiency of these filter media (dry paper, wet paper, non-woven) and the configuration of air filter for vehicle were measured in this study. The following results were obtained on the basis of air filter test. It shows that the thickness and poresize of filter media should be lower for the higher efficiency. The measurement result shows that the performance of round shape filters are higher than the square shape filters. The dust holding capacity of the wet paper and the non-woven paper is higher than the dry paper. As a result, this research can provide an important design parameter and product guidance of the intake air filter for vehicular engine.

Filtration Performance and Physical Properties of Bag Filter Media with Polytetrafluoroethylene Coating Treatments (Polytetrafluoroethylene 코팅 처리된 백필터 여재의 여과성능과 물리적 특성)

  • Yeo, Sang-Young;Kim, Sook-Rae;Jeong, Sung-Hoon
    • Textile Science and Engineering
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    • v.42 no.5
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    • pp.329-335
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    • 2005
  • Bag filter media were prepared by a combination of needle punching and thermal bonding processes and treated with Polytetrafluoroethylene(PTFE) aqueous solution. The air permeability of the prepared filter media increased with increasing needle strokes. As needling strokes increased, the pore size distribution became narrow and the tensile strength in the machine and cross direction approached an intermediate value suggesting isotropic nature. From the result of air filter performance test, the pressure difference of bag filter media decreased and the collection efficiency increased with increasing-needle strokes under a constant air flow rate. Both air permeability and average pore size of the coated filter media were largely reduced by the PTFE coating treatment. After PTFE coating, we identified a big decrease in the dust concentration compared with control media. Therefore, the filtration performances such as collection efficiency and pressure difference of bag filter media were promoted by the PTFE coating treatment.

Analysis to Select Filter Media and The Treatment Effect of Non-point Pollution Source in Road Runoff

  • Lee, Tae Goo;Han, Young Hae
    • KIEAE Journal
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    • v.14 no.3
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    • pp.55-63
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    • 2014
  • This study selected and analyzed filter media that can be applied in non-point pollution reduction devices aimed at processing the source of pollution on site for road runoff that increases rapidly in rainfall-runoff in order to improve the water quality of urban areas. First, the factors that affect the quality of runoff caused by sources of non-point pollution include physical and social factors such as the usage of land around the area of water collection, type of pavement and movement of cars and people, as well as rainfall characteristics such as frequency, intensity, amount and duration of rainfall. Second, the purification tests of the filter media were processed for pH, BOD, COD and T-P, and the filter media showed to have initial purification effect at that items. However, the filter media showed to be very effective for the processing of SS, T-N, Zn and Cd from the beginning to the end. Third, for filter media, zeolite and vermiculite showed to be effective for processing SS, T-N, Zn and CD constantly, and composite filter media including zeolite showed to have strong processing effects. The authors conclude that this study can be applied to technical areas and policies aimed at reducing non-point pollution in urban areas and can also contribute to allowing eco-friendly management of rainfall as well as improvement of water quality.

Comparison of the Nitrification Efficiencies of Three Biofilter Media in a Freshwater System

  • Harwanto, Dicky;Oh, Sung-Yong;Jo, Jae-Yoon
    • Fisheries and aquatic sciences
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    • v.14 no.4
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    • pp.363-369
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    • 2011
  • Total ammonia nitrogen (TAN) removal efficiencies of a sand filter (SF), polystyrene microbead filter (PF), and Kaldnes bead filter (KF) media were evaluated under ammonia loading rates of 5, 25, and 50 g $m^{-3}day^{-1}$. The volume of each filter media tested was 7 L, and the water flow rate for all filter media was 24 L/min. The specific surface areas of the SF, PF, and KF were 7,836, 3,287, and 500 $m^2/m^3$, respectively. Sand was fluidized and the other two media were trickle filtered. The volumetric TAN removal rate increased with increasing ammonia loading rate for all filter media. Mean volumetric TAN removal rates under the ammonia loading rates of 5, 25, and 50 g $m^{-3}day^{-1}$ in SF (39.3, 168.6, and 322.7 g $m^{-3}day^{-1}$, respectively) were higher than those in PF (35.0, 157.4, and 310.5 g $m^{-3}day^{-1}$, respectively) and KF (32.1, 142.5, and 288.1 g $m^{-3}day^{-1}$, respectively). These results were related to differences in the specific surface areas of the filter media. PF was the most economic media for efficiently removing TAN.

Effects of the Ratio of Diatoms Length to the Effective Size of Filter Medium on Filter Clogging (규조류의 크기와 여재의 유효경이 여과지 폐색에 미치는 영향)

  • Jun, Hang-Bae;Lee, Young-Ju;Lee, Byung-Du;Ahn, Chang-Jin
    • Journal of the Korean Geoenvironmental Society
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    • v.2 no.1
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    • pp.31-35
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    • 2001
  • The effects of the ratio of effective size of filter media and diatom size on filter run time were evaluated by using both reported data and experimental results from several water treatment plants. For single media at several WTPs, the range of probability of the filter run time less than 15hr was 10~60%, and for dual media, that of the filter run time less than 30hr was 10~20%. The major filter clogging algae was Synedra acus of which dominant ratio was in the range of 64~92%. The effective size(ES) of filter medium for dual media filter was 0.71~1.40mm and uniformity coefficient of the filter was 1.25~1.67. The effective size(ES) of filter medium for single medium filter was 0.52~0.65mm and uniformity coefficient of the filter was 0.25~1.40. The range of calculated penetration depth was 2.58~15.4cm for dual media and 1.29~2.17cm for single media, and average filter run time was 40.1~83.3hr and 13.9~34.9hr, respectively. When Synedra counts were over 400cells/ml for single media, filter run time was below 5hr, while filter run time for dual media filter, remained as high as 70hr.

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