Rotating biological contactor
US4137172A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1977 |
| Grant date | Jan 30, 1979 |
| Priority date | — |
| Expiry date | Aug 17, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Apparatus for treating sewage by providing a plurality of uniquely designed thin discs that are mounted on a shaft so that the discs are immersed approximately 40% in a sewage tank. The shaft is rotated at peripheral speeds on the order of 35-75 feet per minute to alternately expose the discs to the atmosphere and the liquid containing wastewater in the tank to treat the wastewater in the tank by providing for the growth of biological slimes on the surfaces of the discs. The discs have a corrugated configuration with the corrugations of the alternate discs disposed at ninety degrees to each other to provide maximum usable surface area in a given rotating volume while having sufficient clearance to permit unobstructive sloughing of growths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.