Anaerobic digestion process for organic wastes
US4491522A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1983 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | Nov 15, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/801
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The present invention relates to an anaerobic digestion process for organic wastes with a high efficiency and an improved recovery rate of methane. This process comprises the following steps: (1) anaerobically digesting organic wastes under simultaneous presence of facultative anaerobic bacteria and obligatory anaerobic bacteria, (2) separating the anaerobically digested slurry obtained from the step (1) into a liquor fraction containing the two groups of bacteria and an undecomposed solid fraction, (3) mixing the liquor fraction obtained from the step (2) with the surplus activated sludge slurry produced by anaerobically treating organic waste water, under anaerobic condition, (4) separating the mixed slurry obtained from the step (3) into a solid fraction containing the surplus activated sludge which has absorbed the two groups of bacteria and a liquor fraction, and recycling back the solid fraction obtained from the step (4) as the sources of the two groups of bacteria and nitrogen to the step (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.