振動板型ダイナミックフィルタによる薄ケースろ過

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  • Thin-cake filtration by use of dynamic filter with vibrating plate.
  • シンドウバンガタ ダイナミック フィルター ニ ヨル ハク ケークソウ ロカ

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High filtration rate can be achieved by limiting cake growth in a dynamic filter. Dynamic filtration, which only allows the formation of ultra-thin cake, is accomplished by use of vibrating plates moving parallel to the cake surface. Effects of the vibration parameters on filtration performance are studied under vacuum, constantpressure conditions. Three types of vibrating plates are employed : a flat plate, a plate with grooves and a plate with protrusions, each maintained at a small clearance from the filter medium. The filter cake is continuously swept from the medium surface by the shearing action of liquid flow generated by vibrating the plate. It is shown that the thin cake allows a much higher filtration rate in vibratory filtration than that in conventional cake filtration. It is also demonstrated that the vibratory filtration rate depends mainly on the maximum velocity of the vibrating plate. A method is developed for evaluating the variations of filtrate volume with time by introducing an empirical correction factor, called a vibratory filtration rate factor, into the Ruth filtration rate equation.

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