Nitrification treatment of wastewater
US4415454A · kind A · utility
57Cited by
8References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1981 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Sep 1, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/903
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a two stage activated sludge plant, where in the first stage the major proportion of the organic pollutants is decomposed and in the second stage the decomposition of the residual organic pollutants is conducted in conjunction with nitrification, the nitrifying bacteria are fixed on a low-density, macroporous carrier, e.g., particulate, polyurethane, optionally with activated carbon as well. The second stage can be operated as a mixed activated sludge tank or a biological filter, and in either case, it is possible to avoid a post clarification stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.