Underdrain unit for granular filtration system

Details Underdrain unit for granular filtration system Underdrain unit for granular filtration system

1998-10-13

2000-07-18

Cintins, Ivars

Liquid purification or separation

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

With rehabilitation means

210275, 210293, B01D 2446

Patent

active

060902841

ABSTRACT:
An underdrain unit of the type having air and water backwash for backflushing a granular filtration system has improved retention structure for retaining folded, perforated stainless steel underdrain plates against the floor of the tank drain. The retention structure is in the form of hollow horizontal tubes which not only hold the folded plates in place but also serve to deliver backwashing air. Thus, instead of air delivery tubes being mounted above a series of brackets that hold the folded plates in place against the floor, the air delivery in the system of the invention is via the same structural element which retains the folded plates. Embodiments are described for gravel bed systems and for sand filter systems.

REFERENCES:
patent: 3468422 (1969-09-01), Camp
patent: 4331542 (1982-05-01), Emrie
patent: 5019259 (1991-05-01), Hambley
patent: 5156738 (1992-10-01), Maxson
patent: 5332497 (1994-07-01), Shea et al.
patent: 5865999 (1999-02-01), Shea et al.

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