Filter underdrain system for backwash flow and method for...

Details Filter underdrain system for backwash flow and method for... Filter underdrain system for backwash flow and method for...

2006-11-21

2006-11-21

Cintins, Ivars C. (Department: 1724)

Liquid purification or separation

Particulate material type separator, e.g., ion exchange or...

With rehabilitation means

C210S275000, C210S293000

Reexamination Certificate

active

07138056

ABSTRACT:
A filter underdrain system and a method for measuring the water flow through the underdrain filter system. The apparatus includes panel members assembled to form a perforate grid on the filter base structure of an underdrain block. The panels are generally rectangular and have an upper and lower surface. Multiple apertures are provided in the panel member. The number and/or size of the apertures are dimensioned to prevent the egress of filter media and to obtain substantially uniform backwash flow in the underdrain thereby reducing or eliminating water maldistribution.

REFERENCES:
patent: 4331542 (1982-05-01), Emrie
patent: 4619765 (1986-10-01), Roberts
patent: 4627923 (1986-12-01), Ross
patent: 4771804 (1988-09-01), Morales
patent: 5019259 (1991-05-01), Hambley
patent: 5149427 (1992-09-01), Brown et al.
patent: 5269920 (1993-12-01), Brown et al.
patent: 5865999 (1999-02-01), Shea et al.
patent: 5976370 (1999-11-01), Medworth
patent: WO 91/10493 (1991-07-01), None
patent: WO 97/040907 (1997-11-01), None
AWI brochure, “The AWI Phoenic Underdrain System”, date unknown but at least as early as Apr. 30, 1998.

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