CPC B01D 61/08 (2013.01) [B01D 63/10 (2013.01); B01D 65/02 (2013.01); B01D 65/08 (2013.01); B01D 69/06 (2013.01); C02F 1/441 (2013.01); B01D 2321/02 (2013.01); B01D 2321/04 (2013.01); B01D 2321/18 (2013.01); B01D 2321/2058 (2013.01); B01D 2321/2083 (2013.01); B01D 2325/06 (2013.01); B01D 2325/08 (2013.01); C02F 2103/08 (2013.01); C02F 2303/16 (2013.01)] | 18 Claims |
1. A filter media comprising:
a first membrane portion having a first surface and a second surface opposite said first surface; and
a plurality of raised features formed in a uniform two-dimensional array on at least said first surface of said first membrane portion, said plurality of raised features being formed in a predetermined configuration defining a plurality of rows and a plurality of columns; and wherein
each successive row of said plurality of rows is offset with respect to a preceding row;
each of said plurality of raised features comprises an apex joining two legs of substantially equal length;
each of said legs of each of said plurality of raised features has a same predetermined leg length;
each of said plurality of raised features has a maximum width measured in a row direction;
said plurality of raised features includes a first raised feature disposed in a first row of said array;
said plurality of raised features includes a second raised feature disposed in a second row of said array, said second row of said array being disposed immediately adjacent to said first row of said array;
said plurality of raised features includes a third raised feature disposed in said first row of said array, said third feature being disposed immediately adjacent to said first raised feature;
a shortest diagonal distance between a distal end of one of said legs of said first feature and the apex of said second feature is greater than said same predetermined leg length;
a narrowest distance between said first feature and said third feature is greater than said maximum width;
said first membrane portion is wound around a collection tube defining an axis;
said plurality of raised features defines a spiral feed channel around said collection tube and parallel to said axis, said feed channel having an inlet side to receive feed solution near a first end of said collection tube and an outlet side to expel reject feed solution near a second end of said collection tube; and
said apex of each of said plurality of raised features points toward said first end of said collection tube.
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