Aeration apparatus and method
US4337152A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Jun 29, 1982 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/75
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A gas-liquid mixing process and apparatus, particularly applied to aeration, especially associated with activated sludge waste-water treatment, wherein complete, efficient mixing of the gas and liquid is achieved initially in a pre-mixing draft tube and secondly in an outer mixing vessel by imparting a turbulent, random generally outward and upward radial motion to the liquid and gas contents of the vessel. A portion of the contents of the vessel is withdrawn and recirculated through the pre-mixing draft tube substantially axially vertically situated within the outer mixing vessel. A lower end of the draft tube has a nozzle opening which produces a net flow which is an axially symmetrical radial jet of recirculating contents, thereby establishing the desired turbulent random motion. In the case of aeration in waste-water treatment, air or other oxygen-containing gas is introduced into the draft tube. The complete and consistent high efficiency of the apparatus and the method used thereby provides significant results in that the energy/dissolved oxygen and detention time per tank is significantly reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.