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:
Jul. 16, 1996
Filed:
Feb. 21, 1995
Gert Petersen, Dragoer, DK;
I. Kruger, Inc., Cary, NC (US);
Abstract
The present invention entails a nitrification-denitrification wastewater treatment process where nitrification and denitrification is carried out in three separate treatment basins. First, wastewater influent is directed from a supply line into a first basin where the wastewater is subject to denitrification. Wastewater held in a second basin is subjected to nitrification while the influent wastewater is directed into the first basin. Effluent from the first basin that is being filled is directed directly to a third basin which performs both denitrification and nitrification at various times during the total process. Purified wastewater from the third basin is directed to a clarifier which separates activated sludge from the purified wastewater and the activated sludge is returned and mixed with the influent wastewater. After a selected time period the influent wastewater being directed to the first treatment basin is switched to where the wastewater influent is now directed into the second treatment basin. Effluent from the second treatment basin is directed directly into the third treatment basin. Throughout the process, each basin is alternately switched between aerobic (Ae) and anoxic (Ao) treatment such that at various times both nitrification and denitrification can be carried out in each of the three basins.