Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1981-02-17
1982-08-03
Hruskoci, Peter A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210128, 210202, 210258, 210262, 210275, 210290, B01D 4102
Patent
active
043426492
ABSTRACT:
The upflow filter assembly includes a primary chamber situated above a secondary chamber within an enclosure and having a filter element spanning the primary chamber towards the upper end thereof. Airlocks are situated near the dividing floor of the two chambers so that when in the liquid treating or filtering mode, they operate to maintain the air/liquid interface between the chambers and prevent liquid from passing into the secondary chamber assisted by compressed air introduced into the secondary chamber. Liquid containing solids and/or flocculents, is fed into the primary chamber adjacent the lower side thereof and gradually fills the chamber with much of the flocculents and solids settling out by gravity. The partially deflocculated liquid then passes up through the filter element to a height above the filter element with excess, relatively clear effluent flowing out through an outlet spaced above the filter element to provide a hydraulic head above the filter element. As the liquid passes upwardly, it passes through the flocculent mat formed in the primary chamber which also acts as a filter. When it is desired to flush the filter assembly, the secondary chamber is opened to the atmosphere through a conduit extending upwardly through the filter assembly, and the compressed air is closed off. This releases the airlocks and the liquid and sludge from the primary chamber flushes through the airlocks into the secondary chamber and then through an outlet to be discharged. The hydraulic head of liquid above the filter element flushes downwardly through the filter element and assists in cleansing same.
REFERENCES:
patent: 3419491 (1968-12-01), Messa
patent: 3524810 (1970-08-01), Mackrle et al.
patent: 3534855 (1970-10-01), Guillerd et al.
patent: 3549012 (1970-12-01), Mackrle et al.
patent: 3820658 (1974-06-01), Cruze, Jr.
patent: 4282105 (1981-08-01), Crowe
Ade Stanley G.
Hruskoci Peter A.
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