Filter disc

1996 ◽  
Vol 33 (10) ◽  
pp. 866
Keyword(s):  
Filter Disc

Mass sensing by filter disc resonance: A progress report

1998 ◽  
Vol 29 ◽  
pp. S961-S962
Author(s):  
P. Lilienfeld ◽  
R. Steg
Keyword(s):  
Progress Report ◽  
Mass Sensing ◽  
Filter Disc

scholarly journals A rapid method for collecting and assaying gradient fractions for radioactive macromolecules (Short Communication)

1974 ◽  
Vol 137 (1) ◽  
pp. 131-133 ◽  
Author(s):  
Leonard Rubinstein ◽  
Alan Rein
Keyword(s):  
Rapid Method ◽  
Glass Fibre ◽  
Short Communication ◽  
Filter Disc

A rapid method is described for collecting gradients after centrifugation, and assaying them for acid-precipitable radioactivity. An entire gradient is collected and processed on a single glass-fibre filter disc. This method allows one easily to assay six gradients for acid-precipitable radioactivity in less than 2h.

New Methods for Measuring Imbibition Capillary Pressure and Electrical Resistivity Curves by Centrifuge

1974 ◽  
Vol 14 (03) ◽  
pp. 243-252 ◽  
Author(s):  
Miklos T. Szabo
Keyword(s):  
Electrical Resistivity ◽  
Gravitational Field ◽  
Capillary Pressure ◽  
Water Reservoir ◽  
Pressure Curve ◽  
Resistivity Index ◽  
Rotary Axis ◽  
New Methods ◽  
Capillary Pressure Curve ◽  
Filter Disc

Abstract Three new techniques have been developed for measuring the imbibition capillary pressure curve of small porous samples by centrifuge. The paper shows the capillary pressure and saturation distributions in the cores subjected to different speeds of rotation by each of the techniques. Combination of these methods with measurements of electrical resistivity also makes it possible to obtain numerous resistivity-index/saturation curves or capillary-pressure/resistivity-index curves relatively quickly in either the drainage direction or the imbibition direction of saturation change. INTRODUCTION TO THE CAPILLARY PRESSURE MEASUREMENTS It has been known for more than 2 decades how to obtain the drainage capillary pressure curve by means of a centrifuge. Recently others have attempted to explain the mechanism of the gravity drainage of porous samples in the gravity field of a centrifuge by demonstrating the saturation distributions along the samples at different speeds of rotation. These works have led to both new methods and new evaluation techniques. However, there is still no method known by which the centrifuge can be used to obtain the capillary pressure curve in the imbibition direction. pressure curve in the imbibition direction. This paper reports the technical and theoretical considerations for thus obtaining such a curve. SHORT, SINGLE-CORE METHOD Both in this and in the following methods a system had to be chosen that would permit the quantity of fluid entering the sample to be controlled and regulated. A system in which the sample is simply surrounded by water could be neglected unless the sample is intermediately wet or oil wet; however, only in the negative capillary pressure interval could it be used. The applicability of this system to the case of water-wet samples may be explained very simply. From a partially oil-saturated sample the oil will be displaced by water, and subjecting this system to a multiplied gravitational field will only accelerate this displacement process. Therefore, there is no chance to regulate the degree of imbibition. A theoretical solution cannot be considered when the side of a sample farthest from the rotary axis is in contact with water or with a water-saturated porous disc because the imbibition occurs against the centrifugal force. Although it is true that imbibition will take place, the rate of imbibition will be slower than would be expected in the disc method in the earth gravitational field. Consequently, a method had to be chosen in which the direction of phase exchange occurs as a result of the natural fluid differences. That is, the water must enter the sample moving off the rotary axis and the quantity of imbibed water must be controllable. Fig. 1 illustrates a test cell that meets the requirements noted above. The cell can be used to obtain both imbibition and drainage data. For imbibition tests the sample is placed in contact with the filter nearest the rotary axis as shown. A fine porous filter paper is placed between the sample and the filter disc to provide good capillary contact. The water reservoir above the filter disc is partially filled. JPT P. 243

Study on Filtration Performance of Rotary Disc Filter with Different Filter Discs

2012 ◽  
Vol 610-613 ◽  
pp. 1265-1269
Author(s):  
Jun Xia Hou ◽  
You Chen Zhang
Keyword(s):  
Pressure Drop ◽  
Filtration Efficiency ◽  
Field Configuration ◽  
Operation Condition ◽  
Know How ◽  
Velocity Magnitude ◽  
Filter Disc ◽  
Distribution Uniformity ◽  
The One ◽  
Triangular Type

Rotary disc filter is widely used in industrial water treatment. There are two methods to improving the filtration efficiency, which are the higher filtration velocity and lower filtration pressure drop; while the type of the filter disc plays an important role on the performance of filtration, In order to know how the filter disc affect performance of filtration, simplified model was used. On this basis, rectangular and triangular type was numerically simulated with the CFD software Fluent, DPM model, then the flow field configuration, velocity magnitude, pressure drop through the filter medium and the distribution of the particles were obtained. Then, the simulation results were analyzed and the conclusion was achieved that was under the same operation condition and porous parameters. Filter disc with a triangular type has greater advantages than the one with a rectangular type in the aspects of lower pressure drop, velocity distribution uniformity and particle distribution, which can highly improve the filtration efficiency.

Sampling concept for microplastics in combined sewage-affected freshwater and freshwater sediments

2020 ◽  
Vol 194 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Simone Lechthaler ◽  
Regina Dolny ◽  
Vanessa Spelthahn ◽  
Johannes Pinnekamp ◽  
Volker Linnemann
Keyword(s):  
Stainless Steel ◽  
Sampling Method ◽  
Treatment Process ◽  
Mesh Size ◽  
Freshwater Sediments ◽  
Size Fractions ◽  
Filter Disc ◽  
General Method

The pollution of the environment with microplastics is an issue of great concern, with research of this topic focusing on the sampling and analysis of microplastics. As the sampling method is connected to the matrices from which the samples are collected, there is no general method for the analysis of microplastics, neither in water nor in sediments and, especially, there is no existing method for combined sewage. To obtain comparable results of samples from different matrices, we present a concept based on samples taken from combined sewage, combined sewage-affected freshwater, and freshwater sediments, which were prepared analogously in a treatment process to establish an equivalent starting sample for further analysis. The concept is based on a filter disc (stainless-steel, 47- mm diameter, 20-μm mesh size) for sampling the different water and sediments. With this filter disc, the removal of organic and anorganic matrices was conducted and then used to generate subsamples of different size fractions, which are identical for all samples and complete the sampling concept.

scholarly journals Field Evaluation of the Membrane Filter-Disc Immunoimmobilization Technique in the Detection of Salmonellae in Egg Products

1981 ◽  
Vol 60 (10) ◽  
pp. 2265-2269 ◽  
Author(s):  
R.N. LaROCHE ◽  
V. DESAI ◽  
BARBARA FRIEDMAN ◽  
B. SWAMINATHAN
Keyword(s):  
Membrane Filter ◽  
Field Evaluation ◽  
Filter Disc ◽  
Egg Products

An improved filter-disc assay for 3H-DNA and serum deoxyribonucleases

1977 ◽  
Vol 10 ◽  
pp. 188-190 ◽  
Author(s):  
Richard Albert Cox ◽  
Muharrem Gokcen
Keyword(s):  
Filter Disc ◽  
Disc Assay

scholarly journals An inorganic anionic polymer filter disc: direct crystallization of a layered silicate nanosheet on a glass fiber filter

RSC Advances ◽  
2016 ◽  
Vol 6 (31) ◽  
pp. 26130-26136 ◽  
Author(s):  
Tomohiko Okada ◽  
Kei Shimizu ◽  
Tomohiko Yamakami
Keyword(s):  
Glass Fiber ◽  
Filter Paper ◽  
Layered Silicate ◽  
Silica Fiber ◽  
Direct Crystallization ◽  
Anionic Polymer ◽  
Glass Fiber Filter ◽  
Hydrothermal Reactions ◽  
Filter Disc ◽  
Fiber Filter

Cation-exchangeable layered silicate nanosheet fine crystals covered thoroughly a commercially available silica fiber filter paper through hydrothermal reactions with LiF, MgCl2 and urea.

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