Process for improving phosphorus removal in waste water treatment without chemical addition
US7285215B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 2007 |
| Grant date | Oct 23, 2007 |
| Priority date | — |
| Expiry date | Apr 7, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/906
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A wastewater treatment process wherein a portion of a mixture of influent waste water and biomass are transferred from a first anaerobic region to a second anaerobic region having a relatively long retention time in order to produce additional very short chain fatty acids therein which are thereafter returned to the first anaerobic region so that biomass therein takes up the very short chain fatty acids. The contents of the first anaerobic region thereafter flow downstream into an aerobic region wherein the biomass takes up phosphorus. A portion of the biomass is returned to the first anaerobic region and a second portion of the biomass is wasted with phosphorus therein, thereby removing phosphorus from the wastewater being treated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.