Method of exhausting dissolved oxygen in a nitrogen removal wastewater treatment process
US5160043A · kind A · utility
27Cited by
7References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1991 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Sep 9, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/903
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The present invention relates to a nitrogen removal wastewater treatment process and system that entails an anoxic treatment zone followed by an oxic treatment zone with internal recycle of mixed liquor from the oxic treatment zone to the preceding anoxic treatment zone. Prior to recycling the nitrified mixed liquor back into the anoxic zone, the mixed liquor is held within a dissolved oxygen exhauster tank for a selected period of time where the dissolved oxygen concentration of the nitrified mixed liquor is substantially reduced to preferably below 0.5 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.