Backwashable media bed filtration system and drop in retrofit kit for same
AssigneeMycelx Technologies Corporation
InventorsHal Alper, Lance Rodeman
Life of this patent
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Abstract
This disclosure relates to filtration screens for use in a backwashable granular media bed filtration system. Drop-in retrofit kits for a backwashable granular media bed filtration system comprising one or more filtrations screens are provided herein. Such screens and kits can comprise a media support screen, a backwash filter screen, or a combination thereof. The kit can further comprise an agitator element comprising an impeller having vanes in which the impeller vane surfaces are coated with an abrasion resistant material. Associated filtration systems and processes are also described herein.
Claims28
A retrofit kit for a backwashable granular media bed filtration system, the kit comprising a backwash filter screen, wherein the backwash filter screen comprises, in series from an upstream side to a downstream side during a backwash cycle:
- (a) a first profile wire assembly comprising:
- [1] multiple, spaced apart, parallel lengths of profile wire having an upstream edge and a downstream edge, wherein upstream edges of the profile wire and spaces therebetween define an upstream side of the profile wire assembly;
- [2] a profile wire cross sectional shape which decreases in width in a downstream direction from the upstream edge which is wider than a downstream edge;
- [3] a space between adjacent parallel lengths of profile wire (slot width) at the upstream edges of the profile wire of from 0.007 inches to 0.013 inches;
- and
- [4] a width of the upstream edge of the profile wire which provides a total space area (slot area) of from 20% to 30% of the total area of the upstream side of the profile wire assembly;
- (b) a first support rod assembly attached to a downstream side of the profile wire assembly and comprising multiple, spaced apart, parallel lengths of support rod oriented substantially orthogonal to the lengths of profile wire, the support rod and support rod assembly having an upstream edge and a downstream edge;
- and
- (c) a first stiffening rod assembly attached to a downstream side of the support rod assembly and comprising multiple, spaced apart, parallel lengths of stiffening rod oriented substantially orthogonal to the lengths of support rod, the stiffening rod having an upstream edge and a downstream edge.
Dependencies are inferred from the claim text.