Cap system for underdrains in gravity filters

Details Cap system for underdrains in gravity filters Cap system for underdrains in gravity filters

B - Operations, Transporting

01

D

B01D 24/38 (2006.01) B01D 24/24 (2006.01) B01D 24/46 (2006.01)

Patent

CA 2106448

CAP SYSTEM FOR UNDERDRAINS IN GRAVITY FILTERS ABSTRACT OF THE DISCLOSURE An improved cap for underdrains in gravity filters has a top surface and a bottom surface with a plurality of tapered screen members defining slots in the top surface. The slots provide communication with the filter bed without passage of fine grain filter media therethrough. The screen members are inclined with respect to horizontal to define a plurality of raised portions in the top surface, each raised portion defining a distribution chamber above the orifices in the distributor. The cap may be included in a capped filter underdrain block having a plurality of ribs and orifices on a top wall of the block. The cap rests on the ribs and cooperates with them to define distribution chambers above the orifices in the top wall of the block. The distribution chambers promote intermixing of air and water prior to introduction to the bed, and the ribs finely meter backwash fluids for even distribution of backwash fluids throughout the entire filter bed.

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