Filtration of Colloidal Particles Using Compacted-Gel Media Packed in a Column

Takaoka, Yuji; Morisada, Shintaro; Ohto, Keisuke; Kawakita, Hidetaka

doi:10.1252/jcej.17we098

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Compared with that of the Mag gel-packed column, the pressure drop of the gel-packed column was larger because of the smaller deformation of Mag gel relative to that of the reference gel in the column. This is because magnetite in the gel particles disturbed the free deformation at the contacting surfaces of the gel particles, resulting in a smaller pressure drop [6,14].…”

Section: Permeation Of Water Through Mag Gelmentioning

confidence: 99%

“…Through such deformation, the gaps between the gel particles become smaller at the bottom of the column compared with those at the top. Because the flow of water through deformable gel particles changes the pores in the flow direction, injected colloids are dynamically separated depending on their size and morphology [6]. Silica particle suspensions have been separated using gel particle deformation in columns.…”

Section: Introductionmentioning

confidence: 99%

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Size Separation of Silica Particles Using a Magnetite-Containing Gel-Packed Column

et al. 2019

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A magnetite-containing gel was prepared by water-in-oil radical polymerization of N,N-dimethylacrylamide and N,N’-methylenebisacrylamide in the presence of magnetite. The size of the prepared gel particles was 86 µm. The obtained magnetite-containing gel was packed in a column and first permeated with water, which revealed that the gel displayed a nonlinear response to pressure drop with increasing flow rate. Thus, the gel particles at the bottom of the column felt more pressure from the fluid than those at the top, causing greater deformation of the gel particles at the bottom of the column than at the top. The gaps between the packed gel particles functioned as pores to filter particles of appropriate size and morphology. An industrial silica particle suspension with particle sizes of 300 nm, 800 nm, and 10 µm was permeated through the gel layer. The smallest (300 nm) silica particles passed through the column. The filtered silica particles were recovered from the gel layer by using a magnet to separate the magnetite-containing gel from the filtered silica particles. This magnetite-containing gel has wide application prospects for the separation of not only ceramics but also other colloids.

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Section: Permeation Of Water Through Mag Gelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Size Separation of Silica Particles Using a Magnetite-Containing Gel-Packed Column

et al. 2019

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“…However, GO at the larger size hardly moved into the gel layer and remained on the surface of the gel layer. The height of the gel layer reduced in flowing water due to the deformation of spherical gel particles, as mentioned in [7]. When the system is used for separation, gaps in the packed gel function as membrane pores.…”

Section: Dependence Of the Height Of The Rise Of The Gel Layer On Thementioning

confidence: 99%

“…When water is permeated from the top of the spherical-gel packed column, the packed gel at the bottom of the column is subjected to a greater force, which leads to a deformation of the packed gel from a spherical to an ellipsoidaland collapsed-polyhedron-like morphology [5,6]. So far, this deformation of the gel layer was used for particle separation [7]. By releasing the applied pressure, the elastic force from the deformed gel rises and, as a result, the packed gel layer rises up because the pressure difference between the gel layer and the opened bottom of the column generates the fluid flow from the bottom of the column.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Filtered Graphene Oxide Residue Using Elastic Gel Packed in a Column by Cross Flow

et al. 2018

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To recover the filtered residues on a gel layer in a column, the method using the elasticity of the gel layer and flowing water in a cross-flow manner is proposed. Polymerized spherical gel (40 µm) was packed in a column to a set height of 0.7 cm. The suspensions of graphene oxide at various sizes and shapes were injected on the top of the gel layer and then water was flowed at a flow rate of 1000 mL•h −1 until 0.10 MPa. By releasing the applied pressure, the elastic gel layer rose up, and the filtered graphene oxide also rose above the layer. This rise of the gel layer is due to the difference of pressure between the gel layer, including the filtered graphene oxide, and the open bottom of the column, using the flow of water. The cross flow of water through the column carried away the larger-sized filtered graphene oxide floating above the gel layer. The elasticity of the gel layer and cross flow through the column has the potential to recover the filtered particles.

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Dewatering of algal suspension using microfiltration with cross flow in the presence of magnetite as a filter aid

Kitani

Demura

Morisada

et al. 2020

Biotechnology Progress

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Dewatering algal suspensions is an important step in the extraction of oil and other useful substances from algae. In this study, sphericalNannochloropsissp. and ellipsoidalMonoraphidiumsp. suspensions were dewatered in the presence of different amounts of 350‐nm magnetite particles using a microfiltration membrane with 360‐nm pores in cross‐flow mode. Magnetite functions as a filter aid by reducing the deformation of the cake of filtered algae on the membrane and providing paths for water to flow through the filtration cake of algae. In the case ofNannochloropsissp., the highest dewatering rate was obtained when the number ratio, defined based on the size and ideal density, betweenNannochloropsissp. and magnetite was 1:12.5, but the addition of magnetite had no observable effect on the filtration of ellipsoidalMonoraphidiumsp. suspensions through the membrane. After dewatering, magnetite was effectively separated from the concentrated algal suspension by the application of a magnetic field in an open flow system. Magnetite has the potential to enhance dewatering performance using a cross‐flow membrane system.

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Filtration of Colloidal Particles Using Compacted-Gel Media Packed in a Column

Cited by 8 publications

References 13 publications

Size Separation of Silica Particles Using a Magnetite-Containing Gel-Packed Column

Size Separation of Silica Particles Using a Magnetite-Containing Gel-Packed Column

Recovery of Filtered Graphene Oxide Residue Using Elastic Gel Packed in a Column by Cross Flow

Dewatering of algal suspension using microfiltration with cross flow in the presence of magnetite as a filter aid

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