Abstract
When a ceramic filter functioning as a filter and membrane is rotated in a cross-flow filtraito system, the solid in mother-liquor foul the surface of the filter little because of the formation of Taylor vortex. To apply the filtration system for clarification of sake, we studied its characteristics comparing with those of a cross-flow filtration system with a static filter and a dead end filtration system. A sake sample of which large solids had been removed by sedimentation, was used in the experiments, the fluxes of the two cross-flow flitratin systems kept at higher level comparing with that of the dead end one. And the flux of the cross-flow filtration system with the rotating filter was higher than that with a static filer. A typycal flux of the cross-flow system with the rotating filter having 0.5μm pore size for microfiltration was 8 ml/cm2/h in 8 to 22 h after the beginning of the clarification. In other experiments, the flux of the cross-flow filtration system with the rotating filter was found linearly related with rotation speed of the filter and with filtration pressure. The results suggest that keeping high flux in a small-scale cross-flow filtration system would be feasible by using a cross-flow one equipped with the rotating ceramic filter.
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