Log in

Relevant bibliographies by topics / Contact filtration / Journal articles

To see the other types of publications on this topic, follow the link: Contact filtration.

Journal articles on the topic 'Contact filtration'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Contact filtration.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Clark, Sarah C., Desmond F. Lawler, and Robert S. Cushing. "Contact Filtration: Particle Size and Ripening." Journal - American Water Works Association 84, no. 12 (December 1992): 61–71. http://dx.doi.org/10.1002/j.1551-8833.1992.tb05903.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Terao, Hiroaki. "The Hodge filtration and the contact-order filtration of derivations of Coxeter arrangements." manuscripta mathematica 118, no. 1 (August 10, 2005): 1–9. http://dx.doi.org/10.1007/s00229-004-0536-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Monakhov, V. N. "Contact problems of filtration theory in curvilinear domains." Doklady Physics 50, no. 9 (September 2005): 478–82. http://dx.doi.org/10.1134/1.2074119.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Tobiason, John E., Gordon S. Johnson, Paul K. Westerhoff, and Balasubramaniam Vigneswaran. "Particle Size and Chemical Effects on Contact Filtration Performance." Journal of Environmental Engineering 119, no. 3 (May 1993): 520–39. http://dx.doi.org/10.1061/(asce)0733-9372(1993)119:3(520).

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Voigt, Claudia, Beate Fankhänel, Björn Dietrich, Enrico Storti, Mark Badowski, Margarita Gorshunova, Gotthard Wolf, Michael Stelter, and Christos G. Aneziris. "Influence of Ceramic Foam Filters with Al2O3 Nanocoating on the Aluminum Filtration Behavior Tested With and Without Grain Refiner." Metallurgical and Materials Transactions B 51, no. 5 (July 6, 2020): 2371–80. http://dx.doi.org/10.1007/s11663-020-01900-1.

Full text

Abstract:

Abstract In industrial applications, filter materials are often chosen according to cost as well as their processing and thermomechanical properties, but rarely in terms of their behavior during filtration, which is largely due to there being insufficient information available on the influence of filter materials and surface quality on filtration behavior. In this study, the manufacture of functionalized Al2O3 nanofilters was investigated, along with their filtration performance in short- and long-term filtration trials. In addition, sessile drop tests were performed to measure the contact angle of the nanofunctionalized materials, and yielded an approximately 10 deg (11 pct) higher contact angle for nanocoated materials sintered at 800 °C and 1250 °C than for those sintered at 1600 °C and an approximately 23 deg (23 pct) higher contact angle compared to surfaces without a nanocoating. The filtration mechanism was assessed by means of Porous Disk Filtration Analysis (PoDFA) and Liquid Metal Cleanliness Analyzer (LiMCA) monitoring systems, as well as by analysis of the used and infiltrated filters using Scanning Electron Microscopy and Energy Dispersive X-ray analysis (SEM/EDX) technology. Both short-term and long-term filtration trials showed that the filtration behaviors of the reference and nanocoated filters were comparable. It was therefore determined that nanocoating of such filters with Al2O3 does not provide any improvement with regard to filtration performance.

APA, Harvard, Vancouver, ISO, and other styles

6

Eun, Jakyung, Hansol Lee, and Sangmin Jeon. "Regeneration of an electret filter by contact electrification." RSC Advances 11, no. 8 (2021): 4610–15. http://dx.doi.org/10.1039/d0ra09769a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Voigt, Claudia, Jana Hubálková, Tilo Zienert, Beate Fankhänel, Michael Stelter, Alexandros Charitos, and Christos G. Aneziris. "Aluminum Melt Filtration with Carbon Bonded Alumina Filters." Materials 13, no. 18 (September 7, 2020): 3962. http://dx.doi.org/10.3390/ma13183962.

Full text

Abstract:

The wetting behavior was measured for Al2O3-C in contact with AlSi7Mg with a conventional sessile drop test (vacuum, 950 °C and 180 min) and a sessile drop test with a capillary purification unit (vacuum, 730 °C and 30 min). The conventional test yielded contact angles of around 92°, whereas the sessile drop measurement with capillary purification showed a strongly non-wetting behavior with a determined apparent contact angle of the rolling drop of 157°. Filtration tests, which were repeated twice, showed that the Al2O3-C filter possessed a better filtration behavior than the Al2O3 reference filter. For both filtration trials, the PoDFA (porous disc filtration analysis) index of the Al2O3-C filter sample was equal to half of the PoDFA index of the Al2O3 reference filter sample, indicating a significantly improved filtration performance when using Al2O3-C filter. Notable is the observation of a newly formed layer between the aluminum and the Al2O3-C coating. The layer possessed a thickness between 10 µm up to 50 µm and consisted of Al, C, and O, however, with different ratios than the original Al2O3-C coating. Thermodynamic calculations based on parameters of the wetting and filtration trials underline the possible formation of an Al4O4C-layer.

APA, Harvard, Vancouver, ISO, and other styles

8

Tanaka, Kazuhiro, Masanobu Aoki, Shousaku Takahashi, Shuichi Chida, Tsutomu Yasuda, Kazuo Takagi, Hiromichi Yumoto, and Kazumasa Kasakura. "Study on Development of Phosphorus Removal Process by Contact Filtration." Water Science and Technology 23, no. 4-6 (February 1, 1991): 739–45. http://dx.doi.org/10.2166/wst.1991.0524.

Full text

Abstract:

A new phosphorus removal process, that permits smaller sludge production, low operating costs, and stable phosphorus removal has been operated on an experimental basis at a pilot plant. In this process, secondary effluent containing dissolved oxygen is dosed with ferrous salt solution and then contacts with filter media, so that Fe(II) oxidizes and sticks to the filter media surface and phosphorus is removed simultaneously. Study of the experiment results verified the following points. (1) When the influent phosphorus concentration is 3.5 mg/ℓ, the Fe/P mole ratio is 2, and space velocity is 6 per hour, the effluent phosphorus concentration can be reduced to the level of 0.1 to 0.3 mg/ℓ and the removal efficiency can be upgraded to 90% or more. (2) Phosphorus removal progresses rapidly so that phosphorus can be removed to the same extent as that in effluent at the 0 to 60 cm positions (at filtration rate of 200 m/D) in the upper part of the filter media. (3) It is presumed that the substance formed on the filter media surface works as a catalyst for ferrous and phosphorus removal. Therefore, influent pH level must be approximately 6.5 for constant treatment efficiency. (4) 40 to 50% of removed phosphorus adheres to the filter media.

APA, Harvard, Vancouver, ISO, and other styles

9

Haberer, Klaus, and Sabine Normann-Schmidt. "The Haberer Process: Combining Contact Flocculation, Filtration, and PAC Adsorption." Journal - American Water Works Association 83, no. 9 (September 1991): 82–89. http://dx.doi.org/10.1002/j.1551-8833.1991.tb07217.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

WU, C., Y. HONG, Y. YAN, and B. CHANG. "Soil-nonwoven geotextile filtration behavior under contact with drainage materials." Geotextiles and Geomembranes 24, no. 1 (February 2006): 1–10. http://dx.doi.org/10.1016/j.geotexmem.2005.09.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Yuan, Jixia, and Wende Liu. "Filtration, automorphisms, and classification of infinite-dimensional odd contact superalgebras." Frontiers of Mathematics in China 8, no. 1 (February 17, 2012): 203–16. http://dx.doi.org/10.1007/s11464-012-0185-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Li, Xiao, Xiao-Xiong Wang, Tian-Tian Yue, Yuan Xu, Ming-Liang Zhao, Miao Yu, Seeram Ramakrishna, and Yun-Ze Long. "Waterproof-breathable PTFE nano- and Microfiber Membrane as High Efficiency PM2.5 Filter." Polymers 11, no. 4 (April 1, 2019): 590. http://dx.doi.org/10.3390/polym11040590.

Full text

Abstract:

This study shows the feasibility of using electrospinning technique to prepare polytetrafluoroethylene/poly (vinyl alcohol) (PTFE/PVA) nanofibers on PTFE microfiber membrane as substrate. Then, PVA in the fiber membrane was removed by thermal treatment at about 350 °C. Compared to PTFE microfiber substrates, the composite PTFE fiber membranes (CPFMs) have improved filtration efficiency by 70% and water contact angle by 23°. Experimental test data showed that the water contact angle of the sample increased from about 107° to 130°, the filtration efficiency of PM2.5 increased from 44.778% to 98.905%, and the filtration efficiency of PM7.25 increased from 66.655% to 100% due to the electrospun PTFE nanofiber layer. This work demonstrates the potential of CPFMs as a filter for the production of indoor or outdoor dust removal and industrially relevant gas filtration.

APA, Harvard, Vancouver, ISO, and other styles

13

Mu, Qiang. "Natural Filtrations of Infinite-Dimensional Modular Contact Superalgebras." Journal of Applied Mathematics 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/601847.

Full text

Abstract:

The natural filtration of the infinite-dimensional contact superalgebra over an algebraic closed field of positive characteristic is proved to be invariant under automorphisms by characterizing ad-nilpotent elements and the subalgebras generated by certain ad-nilpotent elements. Moreover, we obtain an intrinsic characterization of contact superalgebras and a property of automorphisms of these Lie superalgebras.

APA, Harvard, Vancouver, ISO, and other styles

14

Saltnes, T., B. Eikebrokk, and H. Ødegaard. "Contact filtration of humic waters: performance of an expanded clay aggregate filter (Filtralite) compared to a dual anthracite/sand filter." Water Supply 2, no. 5-6 (December 1, 2002): 17–23. http://dx.doi.org/10.2166/ws.2002.0145.

Full text

Abstract:

Contact filtration performance of a coarse expanded clay aggregates filter (Filtralite) is compared to a conventional dual media anthracite/sand filter. In a contact filtration pilot plant, humic water was coagulated using aluminium sulphate (AS), iron chloride sulphate (ICS), poly-aluminium chloride (PAC) or the bio-polymer chitosan. Filtration experiments were performed at optimum pH and dose conditions for each coagulant found from previous optimisation experiments in the pilot filter plant. The results reveal two main problems in coagulation/filtration of humic waters: short filtration run times for the most commonly used metal salts, and metal residuals in treated water. The best ways to overcome these problems in raw waters high in organic matter, was found to be by the use of a coarse filter bed in combination with chitosan, or a metal salt with the addition of polymer as filter aid. An increased turbidity level in the raw water (as bentonite clay) was found to increase the removal of humics in most cases, as well as increase the filterability of the flocs formed.

APA, Harvard, Vancouver, ISO, and other styles

15

Printsypar, G., M. Bruna, and I. M. Griffiths. "The influence of porous-medium microstructure on filtration." Journal of Fluid Mechanics 861 (December 27, 2018): 484–516. http://dx.doi.org/10.1017/jfm.2018.875.

Full text

Abstract:

We investigate how a filter-medium microstructure influences filtration performance. We derive a theory that generalizes classical multiscale models for regular structures to account for filter media with more realistic microstructures, comprising random microstructures with polydisperse unidirectional fibres. Our multiscale model accounts for the fluid flow and contaminant transport at the microscale (over which the medium structure is fully resolved) and allows us to obtain macroscopic properties such as the effective permeability, diffusivity and fibre surface area. As the fibres grow due to contaminant adsorption, this leads to contact of neighbouring fibres. We propose an agglomeration algorithm that describes the resulting behaviour of the fibres upon contact, allowing us to explore the subsequent time evolution of the filter medium in a simple and robust way. We perform a comprehensive investigation of the influence of the filter-medium microstructure on filter performance in a spectrum of possible filtration scenarios.

APA, Harvard, Vancouver, ISO, and other styles

16

Nagasato, Fumikazu. "Varieties via a filtration of the KBSM and knot contact homology." Topology and its Applications 264 (September 2019): 251–75. http://dx.doi.org/10.1016/j.topol.2019.06.024.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Papin, Alexander, Leonid Gagarin, Anton Sibin, Daria Khvorykh, and Victor Shepelev. "Mathematical Model of Filtration of Ground Waters in Contact with Permafrost." Izvestiya of Altai State University 1, no. 2 (2013): 38–41. http://dx.doi.org/10.14258/izvasu(2013)1.2-06.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Terao, Hiroaki. "Bases of the contact-order filtration of derivations of Coxeter arrangements." Proceedings of the American Mathematical Society 133, no. 07 (January 21, 2005): 2029–34. http://dx.doi.org/10.1090/s0002-9939-05-07767-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

O’Sullivan, C., J. Bluthé, K. Sejpar, T. Shire, and L. Y. G. Cheung. "Contact based void partitioning to assess filtration properties in DEM simulations." Computers and Geotechnics 64 (March 2015): 120–31. http://dx.doi.org/10.1016/j.compgeo.2014.11.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Brown, J. C., V. L. Snoeyink, L. M. Raskin, J. C. Chee-Sanford, and R. Lin. "The effect of various operating conditions and water quality parameters on the removal of perchlorate in a biologically active carbon filter." Water Supply 2, no. 2 (April 1, 2002): 201–6. http://dx.doi.org/10.2166/ws.2002.0064.

Full text

Abstract:

The removal of μg/L concentrations of perchlorate using biologically active carbon filtration (BAC) was investigated. Previous work has shown that BAC filtration can be a highly effective treatment process for the removal of perchlorate from drinking water. The work presented here demonstrated that perchlorate removal using BAC filtration can be inhibited by dissolved oxygen. It also showed that empty-bed contact time is a key process parameter that affects perchlorate removal in the BAC filter. Finally, it was demonstrated that BAC filtration is robust with respect to electron donor addition failure.

APA, Harvard, Vancouver, ISO, and other styles

21

Warren, J. Jasper, Anushree Mohan, Juan Hinestroza, and Roger Barker. "Degradation Processes in Corona-Charged Electret Filter-Media with Exposure to Ethyl Benzene." Journal of Engineered Fibers and Fabrics 2, no. 4 (December 2007): 155892500700200. http://dx.doi.org/10.1177/155892500700200401.

Full text

Abstract:

The degradation of filtration performance for corona-charged electret filter media exposed to ethyl benzene was assessed. Nonwoven corona-charged polypropylene fiber mats were exposed to ethyl-benzene using a custom made apparatus. Evaluated scenarios included ethyl-benzene vapor and liquid exposures. The filtration performance was evaluated using DOP as a test aerosol to measure filtration performance. It was observed that significant filtration degradation occurred only when liquid ethyl benzene came into direct contact with the filter media. No significant changes in the pressure drop or filtration efficiency was observed for any of the exposure scenarios in which the fibers were only exposed to ethyl benzene in the vapor phase.

APA, Harvard, Vancouver, ISO, and other styles

22

Scott, Cheryl F., Harvey Brandwein, John Whitbread, and Robert W. Colman. "Lack of Clinically Significant Contact System Activation During Platelet Concentrate Filtration by Leukocyte Removal Filters." Blood 92, no. 2 (July 15, 1998): 616–22. http://dx.doi.org/10.1182/blood.v92.2.616.414k07_616_622.

Full text

Abstract:

When blood (plasma) contacts certain foreign surfaces, factor XII can activate and trigger a series of reactions leading to cleavage of kininogens with subsequent release of bradykinin. In this study, we investigated two different widely used leukocyte removal filters, Pall PXL8K (A) and Asahi PLS-5A (B), to test whether clinically significant contact activation occurred during leukodepletion of platelet-rich plasma (PRP). Kininogens were measured by particle concentration fluorescence immunoassay (PCFIA), which can detect cleavage of high and low molecular weight kininogens (HK and LK), the parent molecules of bradykinin, to determine if contact activation had occurred. A slight, nonsignificant decrease in HK and LK was observed with filter A after the first 5 mL was filtered that returned to prefiltration levels by the end of the filtration. Specific TotK (the combined measurement of HK and LK heavy chains divided by plasma protein concentration) showed a small, significant decrease with filter A after the first 5 mL of platelet concentrates was filtered that returned to prefiltration levels by the end of the filtration. There were no significant increases or decreases in the cleaved kininogen index (CKI), an index of HK proteolytic activation or HK and LK destruction (with release of bradykinin). These data suggest that small amounts of both HK and LK initially adsorb to filter A and then desorb, primarily intact. These data also indicate that no significant contact activation, as measured by PCFIA, occurs during leukodepletion of platelet concentrates with either filter A or B.

APA, Harvard, Vancouver, ISO, and other styles

23

Servais, P., G. Billen, and P. Bouillot. "Activité biologique dans un filtre à charbon actif en grains." Revue des sciences de l'eau 4, no. 4 (April 12, 2005): 483–98. http://dx.doi.org/10.7202/705112ar.

Full text

Abstract:

Cet article présente les résultats d'une étude, réalisée en usine de production d'eau potable, de la filtration biologique sur charbon actif en grains (CAG) utilisée en seconde filtration à la suite d'une étape d'ozonation. Les buts de cette étude étaient d'étudier la cinétique de colonisation bactérienne des filtres à CAG, d'analyser la qualité de l'eau en sortie de filtres durant la phase de colonisation biologique et de comparer le fonctionnement à l'équilibre biologique de deux filtres à temps de contact « eau-CAG » différents. Les résultats des mesures de biomasse bactérienne fixée, effectuées par une méthode de respiration potentielle de glucose, montrent qu'un volume d'eau filtrée de 30 - 50 103 m3/m2 de filtre est nécessaire pour coloniser le CAG. A ce moment, le biomasse fixée est d'environ 7 µgC/mf de CAG. La comparaison de la qualité de l'eau, en terme de carbone organique dissous biodégradable (CODB), entre l'entrée et la sortie du filtre étudié montre que durant la colonisation le processus de biodégradation, lié à l'installation d'une biomasse bactérienne suffisante, prend donc progressivement le pas sur le processus d'adsorption dominant au départ, mais qui diminue rapidement. La comparaison de filtres, fonctionnant dans des conditions différentes de hauteur de CAG et de vitesse de filtration, montre l'importance du paramètre temps de contact sur l'efficacité de la filtration biologique sur CAG. De ce point de vue, des temps de contact de 10 à 15 minutes offrent une bonne efficacité de la filtration avec un abattement de CODB pouvant dépasser 80 %.

APA, Harvard, Vancouver, ISO, and other styles

24

Alias, Mohamad Haziq, Noor Syafiqah Hassin, Pui Pui Lau, Izan Izwan Misnon, and Rajan Jose. "Effect of PVDF-Ca Ratio on Electrospun Membrane Fabrication for Water Filtration Application." Materials Science Forum 981 (March 2020): 356–61. http://dx.doi.org/10.4028/www.scientific.net/msf.981.356.

Full text

Abstract:

Innovation in water filtration media leads to tremendous focus in academia due to fresh water source declining and contamination. Electrospinning is considered as new and effective protocols in synthesizing filtration membrane for this purpose. Electrospun membrane of PVDF and CA composite at different ratios has been fabricated for water filtration application. The membranes were characterized using TGA, FTIR, viscometer, conductivity testing, contact angle and FESEM. TGA result showed a shifting in thermal stability with respect to the increasing PVDF ratio (90P10C). FTIR analysis showing five membrane samples had the same functional groups included C-F, =C-H, C-O, C=O, C-H and O-H groups. The FESEM showed a nanofiber with an average diameter of 0.43324 nm and posses the average pore size of 0.3068 μm. Contact angle of the membrane is increased by the PVDF increment (130o @ 10:90 ratio). The filtration analysis of lake water demonstrates the best performing membrane 90P10C give 84.9% rejection at a high flux (26,253 L m-2 h-1), low turbidity (0.38 NTU) and comply to Malaysia Water Standard Type 1

APA, Harvard, Vancouver, ISO, and other styles

25

Scott, Cheryl F., Harvey Brandwein, John Whitbread, and Robert W. Colman. "Lack of Clinically Significant Contact System Activation During Platelet Concentrate Filtration by Leukocyte Removal Filters." Blood 92, no. 2 (July 15, 1998): 616–22. http://dx.doi.org/10.1182/blood.v92.2.616.

Full text

Abstract:

Abstract When blood (plasma) contacts certain foreign surfaces, factor XII can activate and trigger a series of reactions leading to cleavage of kininogens with subsequent release of bradykinin. In this study, we investigated two different widely used leukocyte removal filters, Pall PXL8K (A) and Asahi PLS-5A (B), to test whether clinically significant contact activation occurred during leukodepletion of platelet-rich plasma (PRP). Kininogens were measured by particle concentration fluorescence immunoassay (PCFIA), which can detect cleavage of high and low molecular weight kininogens (HK and LK), the parent molecules of bradykinin, to determine if contact activation had occurred. A slight, nonsignificant decrease in HK and LK was observed with filter A after the first 5 mL was filtered that returned to prefiltration levels by the end of the filtration. Specific TotK (the combined measurement of HK and LK heavy chains divided by plasma protein concentration) showed a small, significant decrease with filter A after the first 5 mL of platelet concentrates was filtered that returned to prefiltration levels by the end of the filtration. There were no significant increases or decreases in the cleaved kininogen index (CKI), an index of HK proteolytic activation or HK and LK destruction (with release of bradykinin). These data suggest that small amounts of both HK and LK initially adsorb to filter A and then desorb, primarily intact. These data also indicate that no significant contact activation, as measured by PCFIA, occurs during leukodepletion of platelet concentrates with either filter A or B.

APA, Harvard, Vancouver, ISO, and other styles

26

Li, Ru, Fen Fen Liu, and Ji Fei Deng. "Surface Modification of PS Super-Filtration Membranes with Low Temperature Plasma." Advanced Materials Research 800 (September 2013): 606–9. http://dx.doi.org/10.4028/www.scientific.net/amr.800.606.

Full text

Abstract:

The polysulfone membranes surface modification by the low temperature air plasma for the study. The PS membranes surface composition, filtration, antifouling characteristics with the modification was characterized by water contact angle, water fluxes, interception rate. Polysulfone membranes hydrophilic has been greatly improved, by water contact angle decreased significantly with low temperature air plasma treatment .Optimal conditions for plasma processing are power 60W, 1.5min, vacuum 60Pa.The water fluxes for the modified PS were increased 2.3 times than the nascent one, the interception rate was little changed. Membrane pollution gradually increased as the wastewater permeation flux decreased with time.

APA, Harvard, Vancouver, ISO, and other styles

27

Scriven, R. J., S. K. Ouki, A. S. Doggart, and M. J. Bauer. "The impact of physico-chemical water treatment on a novel flotation/filtration process." Water Science and Technology 39, no. 10-11 (May 1, 1999): 211–15. http://dx.doi.org/10.2166/wst.1999.0658.

Full text

Abstract:

Recent research explored the application of mechanical flocculation ahead of a novel flotation/filtration process (Counter Current Dissolved Air Flotation/Filtration - COCO DAFFTM) and compared it to the process performance seen when hydraulic flocculation was used. The energy input to the system, expressed in terms of the mean velocity gradient, G (s−1), and retention time, t, were used as a guideline for comparison between the two types of flocculation. Generally, better COCO DAFFTM performance resulted from using mechanical flocculation as against that using hydraulic flocculation. High G values (in excess of 80 s−1) were found to give best results, as opposed to values of 30-60 s−1 utilised ahead of conventional treatment. The effect of flocculation contact time on the COCO DAFFTM process was also studied. Current design practice typically utilises 20-30 minutes flocculation contact time. It was found that process performance, in terms of water quality, did not deteriorate excessively if the contact time was reduced to as little as 2 minutes, but filter run times were found to be proportional to contact time.

APA, Harvard, Vancouver, ISO, and other styles

28

Jeż-Walkowiak, Joanna, Malgorzata Komorowska-Kaufman, Zbysław Dymaczewski, Marek M. Sozański, and Przemysław Zakrzewski. "Properties of catalyst for iron and manganese oxidation in filter materials." E3S Web of Conferences 59 (2018): 00014. http://dx.doi.org/10.1051/e3sconf/20185900014.

Full text

Abstract:

The aim of this work is to determine the properties of contact layers of grain of different type of filter media in term of their suitability for catalytical manganese oxidation and auto-activation for manganese removal from groundwater. The following oxidative filtration materials were investigated: auto-activated silica sand taken from full-scale filters (oxide coated filter media), Pyrolox – manganese ore – natural material and Hydrolit – artificially activated material. As a reference two natural not chemically active materials were tested: clean silica sand and clean chalcedonite. The investigation resulted in chemical composition and microstructure parameters of catalyst contact layers of grains. The modern analytical methods were used: EDAX, Raman spectroscopy, mercury and helium porozymetry. The data indicated that catalyst from autoacivated filtration material has better chemical composition and porosity parameters in comparison to tested catalytic filtration materials, making it more suitable for adsorption and catalytic manganese oxidation.

APA, Harvard, Vancouver, ISO, and other styles

29

Ko, Young-Seon, Yun Haeng Joe, Mihwa Seo, Kipil Lim, Jungho Hwang, and Kyoungja Woo. "Prompt and synergistic antibacterial activity of silver nanoparticle-decorated silica hybrid particles on air filtration." J. Mater. Chem. B 2, no. 39 (2014): 6714–22. http://dx.doi.org/10.1039/c4tb01068j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

YAMADA, Harumi, and Isao SOMIYA. "Evaluation of organic chloride precursor produced through contact oxidation-biological filtration process." Japan journal of water pollution research 8, no. 4 (1985): 239–48. http://dx.doi.org/10.2965/jswe1978.8.239.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Jeong, Sanghyun, Tien Vinh Nguyen, Ho Kyong Shon, and Saravanamuthu Vigneswaran. "The performance of contact flocculation–filtration as pretreatment of seawater reverse osmosis." Desalination and Water Treatment 43, no. 1-3 (April 2012): 246–52. http://dx.doi.org/10.1080/19443994.2012.672179.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Li, Z. H., K. Yang, X. J. Yang, and L. Li. "Treatment of municipal wastewater using a contact oxidation filtration separation integrated bioreactor." Journal of Environmental Management 91, no. 5 (May 2010): 1237–42. http://dx.doi.org/10.1016/j.jenvman.2010.02.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Beckman, Richard L., Sandra J. Sofinski, Linda J. Greff, Dale C. Oates, Thomas J. Smith, and Richard J. Simmons. "Bandage Contact Lens Augmentation of 5-Fluorouracil Treatment in Glaucoma Filtration Surgery." Ophthalmic Surgery, Lasers and Imaging Retina 22, no. 10 (October 1991): 563–64. http://dx.doi.org/10.3928/1542-8877-19911001-04.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Hou, An-Li, Szu-Yi Wang, Wen-Pin Lin, Wei-Hsuan Kuo, Tsung-Jen Wang, and Meng-Jiy Wang. "Surface Antifouling Modification on Polyethylene Filtration Membranes by Plasma Polymerization." Materials 13, no. 21 (November 6, 2020): 5020. http://dx.doi.org/10.3390/ma13215020.

Full text

Abstract:

Surface modification on microporous polyethylene (PE) membranes was facilitated by plasma polymerizing with two hydrophilic precursors: ethylene oxide vinyl ether (EO1V) and diethylene oxide vinyl ether (EO2V) to effectively improve the fouling against mammalian cells (Chinese hamster ovary, CHO cells) and proteins (bovine serum albumin, BSA). The plasma polymerization procedure incorporated uniform and pin-hole free ethylene oxide-containing moieties on the filtration membrane in a dry single-step process. The successful deposition of the plasma polymers was verified by Fourier-transform infrared (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) analyses. Water contact angle measurements and permeation experiments using cell and protein solutions were conducted to evaluate the change in hydrophilicity and fouling resistance for filtrating biomolecules. The EO1V and EO2V plasma deposited PE membranes showed about 1.45 fold higher filtration performance than the pristine membrane. Moreover, the flux recovery reached 80% and 90% by using deionized (DI) water and sodium hydroxide (NaOH) solution, indicating the efficacy of the modification and the good reusability of the modified PE membranes.

APA, Harvard, Vancouver, ISO, and other styles

35

Yang, Jiaqi, Mathias Monnot, Lionel Ercolei, and Philippe Moulin. "Impact of Chlorinated-Assisted Backwash and Air Backwash on Ultrafiltration Fouling Management for Urban Wastewater Tertiary Treatment." Membranes 11, no. 10 (September 27, 2021): 733. http://dx.doi.org/10.3390/membranes11100733.

Full text

Abstract:

To improve membrane fouling management, the NaClO-assisted backwash has been developed to improve permeability maintenance and reduce the need for intensive chemical cleanings. This study is aimed to focus on the efficiency of NaClO-assisted backwash in real UF pilot scale and with periodic classic backwash (CB) and air backwash (AB). The impacts on hydraulic filtration performance, physicochemical properties of membrane material under different addition frequencies of NaClO, and the performance of chlorinated CB and AB will be discussed. In result, 10 mg Cl2 L−1 NaClO addition in backwash water is confirmed to greatly improve the overall filtration performance and backwash cleaning efficiency. One condition stands out from the other due to better control of irreversible fouling, less NaClO consumption in 10 years prediction, sustainable and adaptable filtration performance, and less potential damage on the physicochemical properties of the membrane. Additionally, it can be inferred from this experiment that frequent contact with NaClO induced some degradation on the PES-made UF membrane surface properties. To retain the best state of UF membrane on anti-fouling and qualified production, the optimized condition with more frequent NaClO contact was not suggested for long-term filtration.

APA, Harvard, Vancouver, ISO, and other styles

36

Zhao, Yu Hua, Jie Cheng, Xu Yan, and Di Wang. "Study on the Treatment of Compound Micro-Polluted Groundwater by Contact Oxidation Process under Different Filtration Rates." Applied Mechanics and Materials 580-583 (July 2014): 2370–73. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.2370.

Full text

Abstract:

The compound micro-polluted groundwater was treated by three-stage contact oxidation filters with total 1.5m ceramic layer. The filtration rates, in accordance with the time sequence, were respectively 1m/h, 1.5m/h, 2m/h, 3m/h and 4m/h. The result indicated that, in the condition of sufficient dissolved oxygen, the effluent concentration of iron, manganese, ammonia nitrogen and CODMn can met the National Drinking Water Standards. Under the range of filtration rates the average effluent concentration was respectively that 0.073 mg/L, 0.278 mg/L, 0.229 mg/L, 0.172 mg/L and 0.199mg/L for iron; 0.150 mg/L, 0.180 mg/L, 0.110 mg/L, 0.150 mg/L and 0.359 mg/L for ammonia nitrogen. The average concentration of manganese was 1.828mg/L with dropping aeration only, compare with that 0.323mg/L with strengthening aeration under filtration rate 1m/h. And the manganese concentration was 0.061mg/L, 0.062 mg/L, 0.084 mg/L and 0.071 mg/L, respectively under the range of filtration rates of 1.5-4m/h by strengthening aeration. Because of the biological system in filter layer no perfect, humic acid and low temperature, the average removal rate of CODMn was only 16.10% under the 1m/h filtration rate. Then when the rates were up to 1.5m/h-3m/h, effect of CODMn removal increased and the water treated met the Standard with the maturity of filter layer. But under the rate 4m/h CODMn concentration of effluent was exceed the Standard. Meanwhile, in the range of 1m/h-3m/h, consumption of dissolved oxygen respectively were 19.26mg/L, 14.73mg/L, 13.99mg/L and 13.99mg/L.

APA, Harvard, Vancouver, ISO, and other styles

37

Karakurt, Çağrı, and Ferı̇t Öztürk. "Contact structures on AR-singularity links." International Journal of Mathematics 29, no. 03 (March 2018): 1850019. http://dx.doi.org/10.1142/s0129167x18500192.

Full text

Abstract:

An isolated complex surface singularity induces a canonical contact structure on its link. In this paper, we initiate the study of the existence problem of Stein cobordisms between these contact structures depending on the properties of singularities. As a first step, we construct an explicit Stein cobordism from any contact 3-manifold to the canonical contact structure of a proper almost rational singularity introduced by Némethi. We also show that the construction cannot always work in the reverse direction: in fact, the U-filtration depth of contact Ozsváth–Szabó invariant obstructs the existence of a Stein cobordism from a proper almost rational singularity to a rational one. Along the way, we detect the contact Ozsváth–Szabó invariants of those contact structures fillable by an AR plumbing graph, generalizing an earlier work of the first author.

APA, Harvard, Vancouver, ISO, and other styles

38

Cikurel, Haim, Menahem Rebhun, Appiah Amirtharajah, and Avner Adin. "Wastewater effluent reuse by in-line flocculation filtration process." Water Science and Technology 33, no. 10-11 (May 1, 1996): 203–11. http://dx.doi.org/10.2166/wst.1996.0676.

Full text

Abstract:

Granular media filtration is an important treatment process for various reuse applications. Size density, and attachment strength of filter deposits produced by the interaction of effluents with alum, alum-polymer aids and cationic polymers as primary flocculants and the filter media during contact filtration were calculated and compared using existing filtration models. Secondary effluent filtration without flocculant addition was relatively ineffective. Effective alum dose for contact filtration ranges 10 - 20 mg/L. The 10 mg/L is superior, while the latter creates bulky deposit. An addition of 0.05 - 0.1 mg/L of low anionic high molecular weight polymer strengthens the alum-particle bond. Grain size influence seems to be more pronounced at low approach velocities (5-10 m/hr). High cationic, medium to high molecular weight polymers performed equally or better than alum as primary flocculants. High molecular weight cationic polymer-effluent particle deposit has a higher attachment strength than that of the alum, resulting in a smaller detachment with increase of velocity or increase of filtration run length. Cationic, high molecular weight polymers are effective at doses as low as 0.5 mg/L, at different charge densities. High cationic, medium molecular weight polymers are effective at doses > 5 mg/L. The pressure gradient increase and the filtration efficiency is proportional to the polymer dose in the (1-7 mg/L) range. Compared to the high molecular weight polymer, the pressure build up is milder. High cationic, low molecular weight polymers are not effective at doses up to 7 mg/L. The pressure build up is slow following a slow ripening. In high particle loadings, the differences among the various treatments are less pronounced.

APA, Harvard, Vancouver, ISO, and other styles

39

Gitis, V., R. C. Haught, R. M. Clark, and E. Radha Krishnan. "Depressed filtration ripening enhances removal of Cryptosporidium parvum." Water Supply 2, no. 3 (July 1, 2002): 159–68. http://dx.doi.org/10.2166/ws.2002.0098.

Full text

Abstract:

Pilot-scale experiments were conducted to investigate removal of Cryptosporidium parvum by contact granular filtration. The research demonstrated enhanced removal of Cryptosporidium parvum in the presence of kaolin particles. This is believed to be due electrostatic adhesion of Cryptosporidium parvum oocysts to the kaolin clay particles. The elementary physico-chemical interactions between filter granules and suspension particles will be discussed. This innovative concept was successfully implemented to reduce the ripening sequence of subsequent filtration experimental test runs by the addition of large surface area particles to slurry of kaolin and Cryptosporidium parvum in surface water.

APA, Harvard, Vancouver, ISO, and other styles

40

Free, Michael L., Joseph S. Zhu, and Brij M. Moudgil. "Use of a New Particle Contact Probability Filtration Rate Model to Determine the Effect of Particle Size Distribution in Filtration." Separation Science and Technology 33, no. 1 (January 1998): 57–66. http://dx.doi.org/10.1080/01496399808544755.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Zhu, Shang, Yukang Xu, Chen Huang, and Xiangyu Jin. "Triboelectric Effect of Polytetrafluoroethylene Fibers to Improve the Filtration Performance of Air-Purified Materials." Journal of Engineered Fibers and Fabrics 13, no. 1 (March 2018): 155892501801300. http://dx.doi.org/10.1177/155892501801300108.

Full text

Abstract:

The effect of triboelectric behavior of polytetrafluoroethylene (PTFE) on the filtration performance of common air-purified filters was studied. Variations of triboelectric charge density on PTFE films were analyzed by four typical parameters (cycle, applied load, contact area and velocity). The results demonstrated that the addition of PTFE fibers could significantly improve the filtration property of air-purified materials, owning to the accumulation of triboelectric static charge on the fibers.

APA, Harvard, Vancouver, ISO, and other styles

42

Zhao, Xue Hui, Hong Wei Zhang, and Jie Wang. "Effect of Aggregated Floc Circulation on Membrane Fouling in Contact Circulated Coagulation-Membrane Filtration Hybrid Process for Treatment of Surface Water." Advanced Materials Research 864-867 (December 2013): 1226–32. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.1226.

Full text

Abstract:

The effect of aggregated floc circulation on membrane fouling in contact circulated coagulation-membrane filtration hybrid process for treatment of surface water was investigated in this study. In order to understand the floc characteristics, the floc formation, breakage and re-growth were monitored by Mastersizer 2000 under the coagulation dosage of 5, 10, 15 and 20mg/l. A contact circulated coagulation tests were carried out and the effluent was filtered by a dead-end micro-filtration with the hollow fibre membrane. The coagulation effluent quality and the relative permeability J/J0 of membrane was determined at the circulated floc dosage of 22, 44 and 66mg/l. The experiment results indicated that the addition of circulated floc obviously improved the flux decline and the degree of improvement was closely related to the dosage of circulated floc. Compared to traditional coagulation, the contact circulated coagulation was an economic and efficient method to retard the membrane fouling.

APA, Harvard, Vancouver, ISO, and other styles

43

Kondrashev, O. F. "FILTRATION AND MICRO-RHEOLOGICAL ANOMALIES OF POLYMER DRILLING SOLUTIONS." Oil and Gas Studies, no. 6 (January 20, 2019): 65–70. http://dx.doi.org/10.31660/0445-0108-2018-6-65-70.

Full text

Abstract:

The article pays attention to the fact that biopolymer drilling solutions without a solid phase acquire viscoelastic properties in a porous medium that are not fixed by means of standard drilling rheometry. Filtration and micro-rheological (pore scale) studies have established that the depth of penetration of the filtrate and the screening of the bottomhole zone in this case are determined by the degree of structural-mechanical colmatation resulting from the contact interaction of the liquid and rock null.

APA, Harvard, Vancouver, ISO, and other styles

44

Montiel, Antoine, and Bénédicte Welté. "Preozonation coupled with flotation filtration: successful removal of algae." Water Science and Technology 37, no. 2 (January 1, 1998): 65–73. http://dx.doi.org/10.2166/wst.1998.0106.

Full text

Abstract:

The renovating of a new water treatment plant in Paris which produces 15% of the capital's drinking water supply is described: an original treatment plant consisting of a preozonation, a flotation with a low level of coagulant coupled with contact coagulation. Coagulation on filter has been tested on a pilot plant. The results are excellent (95 to 99%) and have led to the building of a new water treatment plant with very flexible operating conditions depending on the quality of the water.

APA, Harvard, Vancouver, ISO, and other styles

45

Cheikhrouhou, M., and D. Sigli. "Influence of the Structure of Fabric Filters on the Velocity and Stress Fields of Filtration Flows in Their Vicinity." Textile Research Journal 58, no. 7 (July 1988): 371–79. http://dx.doi.org/10.1177/004051758805800701.

Full text

Abstract:

An experimental study of filtration flow through textile filters focuses on the area of contact between the filter and the flowing fluid. Optical and complementary techniques based on laser Doppler velocimetry and flow birefringence are applied to filtration, providing precise data for the fine structure of the local velocity and mechanical stress fields near the filters. The effects of the woven structures on the mechanical properties and performance of the filters are studied.

APA, Harvard, Vancouver, ISO, and other styles

46

O, Abosalif K., Ahmed A. A, Shammat I. M, Aljafari A. S, Afifi A. A, and Clive J. Shiff. "A comparative study of three conventional methods for diagnosis urinary schistosomiasis." Journal of The Faculty of Science and Technology, no. 6 (January 13, 2021): 48–61. http://dx.doi.org/10.52981/jfst.vi6.603.

Full text

Abstract:

The general objective of this comparative study was the evaluation of three diagnostic techniques (sedimentation technique using centrifugation, filtration techniques using millipore filter and Ninhydrine stained filter paper) conventional approaches. This was carried out at Alzaidab, River Nile State, Northern Sudan on 93 school children. The study involved the collection of samples from school children of 7 years age and above. A questionnaire was distributed to collect data on gender, age and water contact activities. The examinations on all samples were carried out applying the methods previously mentioned. The results revealed that the overall prevalence rates of Schistosomahaematobium in Alzaidab Nile State were 16.1%, 24.7% and 24.7% using the centrifugation, syringe filtration millipore, ninhydrin – filter paper staining method respectively. According to gender, males showed higher prevalence rates than females using all the techniques mentioned and the highest prevalence rate in males (36.1%) was reported by the syringe filtration millipore and ninhydrin – filter paper staining method. According to age groups, the highest prevalence rate was reported among the group of children over 13 years of age, using all the techniques. The high prevalence rate (64.3%) among the above mentioned group (over 13 year’s of age) was shown by the syringe filtration millipore and ninhydrin – filter paper staining method. The highest prevalence among those who had water contact (32.9%) was shown by the syringe filtration millipore and ninhydrin – filter paper staining method.It was found that the syringe filtration millipore and ninhydrin – filter paper staining methods gave identical and reproducible results, yet the ninhydrin – filter paper staining does not fit for field practice since it can only be carried out in the laboratory.

APA, Harvard, Vancouver, ISO, and other styles

47

Blaive, Bruno, and Jacques Metzger. "On macroscopic spatial averaging of contact and long-range microscopic forces." Collection of Czechoslovak Chemical Communications 53, no. 10 (1988): 2159–67. http://dx.doi.org/10.1135/cccc19882159.

Full text

Abstract:

Even though ensemble averages are sometimes equivalent, or even preferable, to spatial averages, the latter have incontestable significance. Spatial averaging, which has been restricted until now to basic electromagnetic equations, is applied here to the Cauchy equation of movement. Spatial filtration of microscopic properties is especially useful in the case of continuous media subjected to long-range forces, for which no intuitive macroscopic reasoning is possible.

APA, Harvard, Vancouver, ISO, and other styles

48

Mazounie, P., F. Bernazeau, and P. Alla. "Removal of Cryptosporidium by high rate contact filtration: the performance of the prospect water filtration plant during the Sydney water crisis." Water Science and Technology 41, no. 7 (April 1, 2000): 93–101. http://dx.doi.org/10.2166/wst.2000.0120.

Full text

Abstract:

In Sydney, Australia, during July, August and September 1998, three comprehensive boil water notices were issued in response to the detection of elevated concentrations of Giardia and Cryptosporidium in the water system. While the incidence of illness did not increase above background levels, the political impact of these events was sufficient to initiate a full-scale judicial inquiry. The treatment plants came under intense scrutiny, particularly the Prospect Water Filtration Plant, which provides for approximately 85% of Sydney's drinking water demand. As part of the investigation, detailed audits of the Prospect Plant were carried out and Cryptosporidium parvum seeding experiments were undertaken in a prototype plant in order to assess the removal capability of the Prospect filtration process. The overview of the Plant performance and the results of the Cryptosporidium seeding runs presented in this paper confirm that the Prospect Water Filtration Plant was achieving at least 3 logs pathogen removal prior to and during the contamination events.

APA, Harvard, Vancouver, ISO, and other styles

49

Reza, Md Selim, Huiling Zhang, Md Tofazzal Hossain, Langxi Jin, Shengzhong Feng, and Yanjie Wei. "COMTOP: Protein Residue–Residue Contact Prediction through Mixed Integer Linear Optimization." Membranes 11, no. 7 (June 30, 2021): 503. http://dx.doi.org/10.3390/membranes11070503.

Full text

Abstract:

Protein contact prediction helps reconstruct the tertiary structure that greatly determines a protein’s function; therefore, contact prediction from the sequence is an important problem. Recently there has been exciting progress on this problem, but many of the existing methods are still low quality of prediction accuracy. In this paper, we present a new mixed integer linear programming (MILP)-based consensus method: a Consensus scheme based On a Mixed integer linear opTimization method for prOtein contact Prediction (COMTOP). The MILP-based consensus method combines the strengths of seven selected protein contact prediction methods, including CCMpred, EVfold, DeepCov, NNcon, PconsC4, plmDCA, and PSICOV, by optimizing the number of correctly predicted contacts and achieving a better prediction accuracy. The proposed hybrid protein residue–residue contact prediction scheme was tested in four independent test sets. For 239 highly non-redundant proteins, the method showed a prediction accuracy of 59.68%, 70.79%, 78.86%, 89.04%, 94.51%, and 97.35% for top-5L, top-3L, top-2L, top-L, top-L/2, and top-L/5 contacts, respectively. When tested on the CASP13 and CASP14 test sets, the proposed method obtained accuracies of 75.91% and 77.49% for top-L/5 predictions, respectively. COMTOP was further tested on 57 non-redundant α-helical transmembrane proteins and achieved prediction accuracies of 64.34% and 73.91% for top-L/2 and top-L/5 predictions, respectively. For all test datasets, the improvement of COMTOP in accuracy over the seven individual methods increased with the increasing number of predicted contacts. For example, COMTOP performed much better for large number of contact predictions (such as top-5L and top-3L) than for small number of contact predictions such as top-L/2 and top-L/5. The results and analysis demonstrate that COMTOP can significantly improve the performance of the individual methods; therefore, COMTOP is more robust against different types of test sets. COMTOP also showed better/comparable predictions when compared with the state-of-the-art predictors.

APA, Harvard, Vancouver, ISO, and other styles

50

Ridal, Jeff, Brian Brownlee, Gerry McKenna, and Norman Levac. "Removal of Taste and Odour Compounds by Conventional Granular Activated Carbon Filtration." Water Quality Research Journal 36, no. 1 (February 1, 2001): 43–54. http://dx.doi.org/10.2166/wqrj.2001.003.

Full text

Abstract:

Abstract In recent years, musty-earthy tastes in drinking water have become a seasonal problem (September to November) for communities that draw their water from the upper St. Lawrence River. The source of the problem is attributed to the presence of geosmin and 2-methylisoborneol (MIB) at concentrations ranging from 5 to 60 ng/L. In 1997 and 1998, the Cornwall Water Purification Plant added granular activated carbon (GAC) to conventional gravity filters to control taste and odour compounds. We report on a study to test the efficiency of these conventional GAC-capped filters to reduce geosmin and MIB concentrations in finished water as a function of filter age, initial chlorine residual and contact time. GAC–capped filters removed on average 60% of the MIB and 80% of the geosmin from the source water after 2 and 12 months of filter operation. However, testing after 24 months operation showed reduced efficiency. Amounts removed ranged between 13 and 20% (15% average) for MIB and 50 to 57% (54% average) for geosmin in these filters. Testing also suggested that filter efficiency was greater with longer contact times and with higher chlorine residuals (in the range 0.1 to 0.6 mg free Cl2/L). In addition to carbon age, chlorine residual and contact time, flow channelization and slow release of the taste and odour compound load (particularly MIB) from the GAC bed may affect apparent filter efficiency.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!