公开(公告)号：EP0553076B1

公开(公告)日：1996-03-27

申请号：EP91900401.0

申请日：1990-10-16

申请人： VOR, Zdenek

发明人： VOR, Zdenek

IPC分类号： B01D24/46

CPC分类号： B01D24/105 ,  B01D24/205 ,  B01D24/4631 ,  B01D24/4684

摘要： PCT No. PCT/SE90/00660 Sec. 371 Date Mar. 30, 1993 Sec. 102(e) Date Mar. 30, 1993 PCT Filed Oct. 16, 1990 PCT Pub. No. WO92/06759 PCT Pub. Date Apr. 30, 1992.The invention relates to a method for washing a filter intended for cleansing a contaminated liquid and having a granular bed, a drainage system located beneath the bed, means for introducing first and second liquid flows into the bed, wherein the first liquid flow is operative to fluidize solely upper bed layers at least locally, and the second liquid flow is operative to fluidize the bed throughout the whole of its depth. The method teaches ejecting the flows of liquid selectively into the bed through orifices which are placed in the bed at a location between the highest point and the lowest point therein and which are substantially equidistant from the upper surface of the bed; and by introducing the first liquid stream into the upper layers of said bed in a smaller quantity and at a corresponding smaller rate than the second liquid stream, such that the bed layers located beneath these upper layers will be unaffected by the ongoing bed washing operation.

公开(公告)号：EP0553076A1

公开(公告)日：1993-08-04

申请号：EP91900401.0

申请日：1990-10-16

申请人： VOR, Zdenek

发明人： VOR, Zdenek

IPC分类号： B01D24 ,  B01D29 ,  B01D35 ,  B01D41

CPC分类号： B01D24/105 ,  B01D24/205 ,  B01D24/4631 ,  B01D24/4684

摘要： PCT No. PCT/SE90/00660 Sec. 371 Date Mar. 30, 1993 Sec. 102(e) Date Mar. 30, 1993 PCT Filed Oct. 16, 1990 PCT Pub. No. WO92/06759 PCT Pub. Date Apr. 30, 1992.The invention relates to a method for washing a filter intended for cleansing a contaminated liquid and having a granular bed, a drainage system located beneath the bed, means for introducing first and second liquid flows into the bed, wherein the first liquid flow is operative to fluidize solely upper bed layers at least locally, and the second liquid flow is operative to fluidize the bed throughout the whole of its depth. The method teaches ejecting the flows of liquid selectively into the bed through orifices which are placed in the bed at a location between the highest point and the lowest point therein and which are substantially equidistant from the upper surface of the bed; and by introducing the first liquid stream into the upper layers of said bed in a smaller quantity and at a corresponding smaller rate than the second liquid stream, such that the bed layers located beneath these upper layers will be unaffected by the ongoing bed washing operation.