Regeneration of fixed bed filters

Details Regeneration of fixed bed filters Regeneration of fixed bed filters

1977-02-24

1978-08-01

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 82, B01D 2324

Patent

active

041041631

ABSTRACT:
This application is directed to the regeneration of fixed bed granular media filters used for the clarification of liquids, after said filters have become unsuitable or inefficient due to the occlusion of oily substances. One such regeneration method comprises the steps of: backwashing the filter, draining the filter, contacting the filter with an aqueous alkali solution composed of sodium hydroxide dissolved in demineralized water, said solution having a pH value of about 10.5 or greater, at a temperature ranging from about ambient to about 200.degree. F, for a time sufficient to regenerate the filter, and backwashing the filter. Generally, the alkali solution comprises about 0.1 to about 50 weight percent aqueous sodium hydroxide and the contacting is conducted for a period of about 0.1 to about 10 hours.

REFERENCES:
patent: 2367384 (1945-01-01), Tymstra et al.
patent: 2956682 (1960-10-01), Stephan
patent: 3574329 (1971-04-01), Beavon
patent: 3803031 (1974-04-01), Keller, Jr.
patent: 3867285 (1975-02-01), Keller, Jr.

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