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:
Oct. 03, 1995
Filed:
Jan. 03, 1994
Applicant:
Inventors:
Harold E Davis, Groton, MA (US);
Donald C Bullock, Concord, NH (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210617 ; 210622 ; 210138 ; 210196 ; 210201 ;
Abstract
The invention is directed to a sewage treatment system comprising a tank in which biological treatment by microorganisms occur in mixed liquor and a circulating loop for removing mixed liquor from the tank and returning oxygen enriched aerated mixed liquor to the tank. The mixed liquor is removed and returned to the tank through a pair spaced apart submerged filters. One alternative construction is to use a pressure tank in the circulation loop to increase the percentage of dissolved oxygen in the aerated mixed liquor.