System for improved biological nutrient removal
US6882419B2 · kind B2 · utility
16Cited by
2References
20Claims
0Family size
Inventors
Key dates
| Filing date | Oct 31, 2002 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Jul 12, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/173076
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is provided for the determination of NO2− and/or NO3− in water by subjecting the water sample to ultraviolet resonance Raman spectroscopy within the range of wavelengths of 200-240 nm, and determining the presence of NO2− and/or NO3− based on the Raman spectral measurement. The method has particularly applicability to the determination of such ions in wastewater, such as in activated sludge washwater treatment reactors. The method may also be employed with advantage in the control of processes involving the removal of ammonium ions upon reaction with oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.