Oxidation ditch modification and automated control system for nitrogen removal and sludge settling improvements
US5582734A · kind A · utility
51Cited by
7References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 14, 1993 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Sep 14, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/903
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for treating municipal wastewater in an oxidation ditch activated sludge system by automated determination of the nitrogen depletion inflection point, which enables anoxic cycles to be utilized to achieve improved settling of the activated sludge by providing selective pressure against the growth of filamentous bacteria, by providing improved total nitrogen removal, by providing energy savings and by providing recovery of alkalinity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.