Improving the uniformity of distribution of properties over the filtration area of powder filter materials

2021 ◽  
Author(s):  
A. Ph. Ilyushchanka ◽  
R. A. Kusin ◽  
I. N. Charniak ◽  
A. R. Kusin ◽  
E. N. Eremin
Keyword(s):  
Filter Materials ◽  
Filtration Area

Selecting a Method for the Manufacture of Porous Powder Filter Products

2021 ◽  
pp. 24-34
Author(s):  
A.Ph. Ilyushchankа ◽  
R.A. Kusin ◽  
I.M. Charniak ◽  
A.R. Kusin ◽  
E.N. Eremin
Keyword(s):  
Radial Compression ◽  
Porous Powder ◽  
Metal Powders ◽  
Pore Former ◽  
Filter Materials ◽  
Manufactured Products ◽  
Permeability Distribution ◽  
Filtration Area ◽  
Original Powder ◽  
Distribution Uniformity

The article considers three methods of increasing the distribution uniformity of properties over the filtration area of powder filter materials at different stages of their manufacturing. It is shown that granulation of metal powders with a pore former increases the uniformity of permeability distribution over the filtration area by a factor of 2.3–3.5. Dry radial isostatic pressing ensures high distribution uniformity of properties, while the coefficient of variation of local permeability does not exceed 0.17. Radial compression allows increasing the uniformity of permeability distribution over the filtration area by 15 ... 22 % compared to that for the original powder filter materials. The selection of the method used in practice is determined by the shape, size and properties of the manufactured products and initial powders. The considered methods can be used in petrochemical engineering for the manufacture of porous powder products for filtering purposes, used to trap catalyst particles, filters for fine and coarse fuel and oil purification.

Analysis of the precipitation reactor-separation equipment system. Continuous reactor and the rotary vacuum filter operating at the selected negative pressure drop

1981 ◽  
Vol 46 (10) ◽  
pp. 2364-2370 ◽  
Author(s):  
Otakar Söhnel
Keyword(s):  
Pressure Drop ◽  
Negative Pressure ◽  
Continuous Reactor ◽  
Vacuum Filter ◽  
Continuous Precipitation ◽  
Derived Relations ◽  
Filtration Area ◽  
Separation Equipment ◽  
Unit Output ◽  
Rotary Vacuum

An analysis has been performed of the continuous precipitation reactor - rotary vacuum filter system (operating at the selected negative pressure drop) on the basis of the unit output. Filtration area necessary for separation of the product from the precipitation reactor is a function of the mean residence time of suspension in the reactor, concentration of the precipitating solutions, porosity of the filtration cake and the filtration negative pressure drop. Application of the derived relations is demonstrated on the continuous precipitation of Mg(OH)2.

scholarly journals Unravelling the process of petroleum hydrocarbon biodegradation in different filter materials of constructed wetlands by stable isotope fractionation and labelling studies

2021 ◽  
Author(s):  
Andrea Watzinger ◽  
Melanie Hager ◽  
Thomas Reichenauer ◽  
Gerhard Soja ◽  
Paul Kinner
Keyword(s):  
Stable Isotope ◽  
Constructed Wetlands ◽  
Hydrogen Isotope ◽  
Petroleum Hydrocarbon ◽  
Isotope Fractionation ◽  
Isotope Effects ◽  
Filter Material ◽  
Hydrocarbon Biodegradation ◽  
Stable Isotope Fractionation ◽  
Filter Materials

AbstractMaintaining and supporting complete biodegradation during remediation of petroleum hydrocarbon contaminated groundwater in constructed wetlands is vital for the final destruction and removal of contaminants. We aimed to compare and gain insight into biodegradation and explore possible limitations in different filter materials (sand, sand amended with biochar, expanded clay). These filters were collected from constructed wetlands after two years of operation and batch experiments were conducted using two stable isotope techniques; (i) carbon isotope labelling of hexadecane and (ii) hydrogen isotope fractionation of decane. Both hydrocarbon compounds hexadecane and decane were biodegraded. The mineralization rate of hexadecane was higher in the sandy filter material (3.6 µg CO2 g−1 day−1) than in the expanded clay (1.0 µg CO2 g−1 day−1). The microbial community of the constructed wetland microcosms was dominated by Gram negative bacteria and fungi and was specific for the different filter materials while hexadecane was primarily anabolized by bacteria. Adsorption / desorption of petroleum hydrocarbons in expanded clay was observed, which might not hinder but delay biodegradation. Very few cases of hydrogen isotope fractionation were recorded in expanded clay and sand & biochar filters during decane biodegradation. In sand filters, decane was biodegraded more slowly and hydrogen isotope fractionation was visible. Still, the range of observed apparent kinetic hydrogen isotope effects (AKIEH = 1.072–1.500) and apparent decane biodegradation rates (k = − 0.017 to − 0.067 day−1) of the sand filter were low. To conclude, low biodegradation rates, small hydrogen isotope fractionation, zero order mineralization kinetics and lack of microbial biomass growth indicated that mass transfer controlled biodegradation.

scholarly journals Tannic acid-functionalized HEPA filter materials for influenza virus capture

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Subin Kim ◽  
Jinhyo Chung ◽  
Sang Hyun Lee ◽  
Jeong Hyeon Yoon ◽  
Dae-Hyuk Kweon ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Tannic Acid ◽  
High Efficiency ◽  
Influenza Viruses ◽  
Capture Efficiency ◽  
Protective Equipment ◽  
Filter Materials ◽  
Washing Process ◽  
Pathogenic Viruses ◽  
Cost Efficient

AbstractInfluenza, one of the most contagious and infectious diseases, is predominantly transmitted through aerosols, leading to the development of filter-based protective equipment. Though the currently available filters are effective at removing submicron-sized particulates, filter materials with enhanced virus-capture efficiency are still in demand. Coating or chemically modifying filters with molecules capable of binding influenza viruses has received attention as a promising approach for the production of virus-capturing filters. For this purpose, tannic acid (TA), a plant-derived polyphenol, is a promising molecule for filter functionalization because of its antiviral activities and ability to serve as a cost-efficient adhesive for various materials. This study demonstrates the facile preparation of TA-functionalized high-efficiency particulate air (HEPA) filter materials and their efficiency in influenza virus capture. Polypropylene HEPA filter fabrics were coated with TA via a dipping/washing process. The TA-functionalized HEPA filter (TA-HF) exhibits a high in-solution virus capture efficiency of up to 2,723 pfu/mm2 within 10 min, which is almost two orders of magnitude higher than that of non-functionalized filters. This result suggests that the TA-HF is a potent anti-influenza filter that can be used in protective equipment to prevent the spread of pathogenic viruses.

Thermal Destruction of Nonwoven Filter Materials from Polystyrene and Polymethyl Methacrylate

2013 ◽  
Vol 44 (6) ◽  
pp. 377-380 ◽  
Author(s):  
I. A. Kapustin ◽  
I. Yu. Filatov ◽  
Yu. N. Filatov
Keyword(s):  
Polymethyl Methacrylate ◽  
Thermal Destruction ◽  
Filter Materials

Heavy metal removal mechanisms of sorptive filter materials for road runoff treatment and remobilization under de-icing salt applications

2016 ◽  
Vol 102 ◽  
pp. 453-463 ◽  
Author(s):  
Maximilian Huber ◽  
Harald Hilbig ◽  
Sophia C. Badenberg ◽  
Julius Fassnacht ◽  
Jörg E. Drewes ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Road Runoff ◽  
Filter Materials ◽  
Removal Mechanisms

Permeable fiber filter materials. Part 2. Filtering parameters

1990 ◽  
Vol 29 (2) ◽  
pp. 118-121 ◽  
Author(s):  
Yu. Yu. Belous ◽  
A. G. Kostornov ◽  
Yu. M. Efimenko ◽  
L. E. Lunin
Keyword(s):  
Filter Materials ◽  
Fiber Filter

Studies on processing of layered oxide‐bonded porous sic ceramic filter materials

2021 ◽  
Author(s):  
Atanu Dey ◽  
Nijhuma Kayal ◽  
Omprakash Chakrabarti ◽  
Nilo M. Fortes ◽  
Murilo D. M. Innocentini ◽  
...  
Keyword(s):  
Ceramic Filter ◽  
Layered Oxide ◽  
Filter Materials ◽  
Sic Ceramic ◽  
Porous Sic

Filtermaterialien für die FVK-Nasszerspanung/Filter materials for FRP machining – retention rate for filter materials during the wet machining of fiber-reinforced plastics

2021 ◽  
Vol 111 (05) ◽  
pp. 343-348
Author(s):  
Simon Kleinhenz
Keyword(s):  
Retention Rate ◽  
End Users ◽  
Machining Process ◽  
Fiber Reinforced ◽  
Cooling Fluid ◽  
Reinforced Plastics ◽  
Filter Materials ◽  
Fiber Reinforced Plastics

Faserverstärkte Kunststoffe (FVK) bieten aufgrund ihrer hervorragenden gewichtsbezogenen Steifigkeiten ein enormes Potenzial bewegte Massen zu reduzieren. Bei der Nasszerspanung solcher Materialien gibt es Vorbehalte durch fehlendes Wissen in der Handhabung und der Wechselwirkung des Kühlschmierstoffes (KSS) mit den Matrixmaterialien. Der Beitrag befasst sich mit der richtigen Handhabung des KSS in der Filtration und der Auslegung des Filtrationsmediums für einen stabilen Prozess beim zerspanenden Endanwender.   Due to their excellent weight-related stiffness, fiber-reinforced plastics (FRP) offer enormous potential for reducing the weight of moving masses. When it comes to wet machining these products, end users often lack knowledge on handling the cooling fluid and its reaction with FRP materials. This article shows in detail how to handle the cooling fluid and how to determine the filtration media for a stable use during the machining process of FRP.

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