Abstract
After filtration, filtered residue is recovered by a spoon, during which, the structure of the residue is destroyed, and the activity of the microorganism would be reduced. Thus, a more efficient recovery method of filtered residue is required. This study addressed the recovery method of filtered residue by the restoration of an elastic membrane, followed by cross flow. An elastic membrane composed of a copolymer of poly(ethylene glycol) diacrylate and polyacrylonitrile was prepared by photopolymerization. The pore diameter of the obtained membrane was about 10 μm. Silica particle (1 and 10 μm) and Nannochloropsis sp. (2 μm) suspension was filtered, demonstrating that silica particles of 10 μm were filtered perfectly, whereas the filtration percentage of 1 μm silica particles and Nannochloropsis sp. was lower. After the filtration, the applied pressure was released to restore the elastic membrane which moved the filtered particles up, then the filtered residue was recovered by cross flow above the membrane, demonstrating that 71% of the filtered 10 μm silica particles was recovered. The elastic behavior of the membrane, along with the cross flow, has the potential to be used as a technique for the recovery of the filtered residues. This proposed scheme would be used for the particle recovery of ceramics, cells, and microorganisms from a lab scale to a large-scale plant.
Highlights
Membranes 2021, 11, 71. https://During the filtration of cells and microorganisms with the filter, a cake layer of residue is formed on the pore [1,2]
For the filtration and separation of particles dispersed in solution, so far, we have proposed the recovery method of particles being filtered by a spherical gel layer packed in a column
Acrylonitrile and poly(ethylene glycol) diacrylate were photopolymerized by adding polyacrylamide
Summary
During the filtration of cells and microorganisms with the filter, a cake layer of residue is formed on the pore [1,2]. For the filtration and separation of particles dispersed in solution, so far, we have proposed the recovery method of particles being filtered by a spherical gel layer packed in a column. To recover the large filtered colloidal particles, the applied pressure was released to restore the gel layer. The filtered residue was raised up by the elasticity of the gel layer. The membrane composed of polyethylene glycol was prepared in a microchannel to determine the deformation of the membrane by applied pressure of fluid flow [10]. Stillstill remains on the membrane pore, a more effective tive method forrecovery the recovery is required.
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