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• W2101521897 abstract "The recovery of exopolysaccharides (EPS) produced by Sinorhizobium meliloti bacteria by dynamic microfiltration was investigated using a rotating disk device designed in our laboratory, equipped with a 0.2 μm nylon membrane. This system differs from commercially available systems by the presence of vanes on the disk which produce a very important increase in permeate flux while yielding excellent EPS transmission. For polymers produced under standard fermentation conditions (70 h at 30°C), the mass flux rose to 650 g h−1 m−2 using a disk equipped with 2 mm vanes rotating at 2000 rpm against 380 g h−1 m−2 with a smooth disk at the same speed. The maximum flux observed was 1560 g h−1 m−2 with a 6-mm vanes disk rotating at 3000 rpm and a 36°C broth. An interesting finding was that the permeate flux Jf for various disks can be correlated by the same function of the mean shear stress at the membrane τwm according to Jf = 4.6 τwm0.717 for a 30°C broth, showing that the effect of vanes is merely to increase the shear stress by raising the fluid core velocity between the membrane and the disk. With 6-mm vanes the core angular velocity was found to be 84% of disk velocity vs. 45% for a smooth disk. When the fermentation temperature was increased to 36°C to produce a lower molecular weight polymer, the permeate flux rose by about 250%, much more than what could be expected from the reduction in permeate viscosity and followed the same power law with membrane shear stress as for 30°C. The same device was equipped with a PES 50 kDa membrane to concentrate EPS by ultrafiltration. Permeate fluxes were of the order of 160 L h−1 m−2 at 2000 rpm and 30°C with nearly complete EPS rejection. Finally, the net electrical power consumed by the disk was measured by subtracting the power consumed without fluid from the power during filtration at the same speed. This power increases with speed and with the presence of vanes, but since the gain provided by the vanes is very high, the specific energy per m3 of permeate is minimal with the highest vanes tested (6 mm) and maximal for smooth disks. © 2003 Wiley Periodicals, Inc. Biotechnol Bioeng 82: 429–437, 2003." @default.
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• W2101521897 date "2003-03-06" @default.
• W2101521897 modified "2023-10-10" @default.
• W2101521897 title "Microfiltration and ultrafiltration of polysaccharides produced by fermentation using a rotating disk dynamic filtration system" @default.
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• W2101521897 doi "https://doi.org/10.1002/bit.10584" @default.
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