Cyclic, multi-stage biological process for wastewater treatment
US4975196A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1990 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Apr 16, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for anaerobic biological waste treatment in multiple stages wherein a relatively high strength wastewater is introduced into a first biological reactor to produce an effluent of reduced strength, the effluent is passed into a second biological reactor for reaction therein, passage of the effluent into the second biological reactor is continued until the biological solids in the second reactor enter into a negative growth phase and become relatively stable, whereupon the flow of waste through the reactors is reversed by terminating introduction of the waste into the first reactor and passing the same into the second reactor to cause microorganisms in the second reactor to enter into a positive growth phase and the solids in the first reactor to enter into a negative growth phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.