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    • 3. 发明授权
    • Filtration system
    • 过滤系统
    • US5221479A
    • 1993-06-22
    • US834801
    • 1992-02-13
    • Masahiro EtohSumio Ohtani
    • Masahiro EtohSumio Ohtani
    • B01D61/14B01D65/02C12H1/07C12N1/02
    • B01D61/147B01D65/02C12H1/063C12N1/02B01D2321/04
    • A dead-end type filtration system wherein a bulk (or bulk suspension) comprising a fluid containing suspended matters is filtered through a micro-filter membrane to separate the fluid form the suspended matters, back wash is periodically carried out under such conditions that pressure on the transmitted fluid side of the filter membrane is higher than pressure on the bulk side thereof, and back wash liquid together with the suspended matters desorbed form the liter membrane is discharged from the filtration system to the outside, characterized by that said filter membrane has an anisotropic structure where the pore diameters of the filter membrane are changed continuously or discontinuously in the thickness direction of the filter membrane, and the pore diameters on one side of the filter membrane are different from those on other side thereof.
    • 一种死端型过滤系统,其中包含含有悬浮物质的流体的本体(或本体悬浮液)通过微过滤膜过滤以从悬浮物中分离出流体,反冲洗在这样的条件下周期性地进行: 过滤膜的透过流体侧高于其主体侧的压力,并且从清洗膜离开的悬浮物与反洗液一起从过滤系统排出到外部,其特征在于,所述过滤膜具有 过滤膜的孔径在过滤膜的厚度方向上连续或不连续地变化,并且过滤膜一侧的孔径与其另一侧的孔径不同的各向异性结构。