The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 1978
Filed:
Feb. 24, 1977
James F Grutsch, Hammond, IN (US);
Standard Oil Company a corporation of Indiana, Chicago, IL (US);
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.