Process for treatment of wastewater
US4304665A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1980 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Jan 7, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method and apparatus for treating wastewater by circulating it around a system comprising a downcomer and a riser communicating with each other at their lower ends, the level of the wastewater in the downcomer being above the level of the wastewater in the riser and providing a hydrostatic pressure head which causes circulation of the wastewater around the system, supplying a gas containing free oxygen to the wastewater as it passes through the downcomer, and pumping the wastewater up from, or from near, the top of the riser to a part of the downcomer, at or near the top thereof, which has, for at least a part of its length, a cross-sectional area which is less than the cross-sectional area of the remainder of the downcomer below the said part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.