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:
Sep. 07, 1993
Filed:
Oct. 13, 1992
Applicant:
Inventor:
Wilhelm Ballnus, Burgwedel, DE;
Assignee:
Schreiber Corporation, Inc., Trussville, AL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210605 ; 210610 ; 210614 ; 210630 ; 210906 ;
Abstract
Activated sludge process for biological waste water treatment comprises controlling the supply of oxygen to a single tank reactor in response to the phosphate concentration in the anaerobic phase independent of turbidity. The oxic phase is initiated if the maximum turbidity set point is exceeded in the usual manner. However, if the phosphate concentration exceeds its maximum set point before the turbidity reaches a maximum, then the oxic phase is initiated to end phosphate release. Acetic acid can be added to increase phosphate elimination at the end of the anaerobic phase, prior to switching on the supply of oxygen.