Underdrain for water filtration system

Details Underdrain for water filtration system Underdrain for water filtration system

1973-07-19

1976-05-11

Spear, Jr., Frank A.

Liquid purification or separation

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

With rehabilitation means

210279, 210293, B01D 2318

Patent

active

039561348

ABSTRACT:
An underdrain is provided in a water filtration system beneath a bed of filter media and comprises a plurality of elongate hollow underdrain units defining respective elongate substantially horizontal fluid passageways therein with the hollow underdrain units being arranged with the elongate fluid passageways thereof in fluid communication with each other and forming a network of fluid passageways beneath the bed of filter media. Each underdrain unit is provided with a plurality of nozzles in the upper wall thereof communicating with the interior of the hollow underdrain unit and with at least some of the nozzles in each underdrain unit cooperating with each other and being arranged in spaced groups. The cooperating nozzles in each group are so oriented as to direct streams of wash water issuing therefrom during backwashing into impingement with each other outside the filter underdrain unit for dispersing the streams of wash water and reducing the velocity thereof.

REFERENCES:
patent: 1572076 (1926-02-01), Paterson
patent: 2378239 (1945-06-01), Myron
patent: 2710692 (1955-06-01), Kegel et al.
patent: 3468422 (1969-09-01), Camp
patent: 3613888 (1971-10-01), Harris
patent: 3869391 (1975-03-01), Graveland et al.

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