Method and device for digestion of sludge
US5906931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1998 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Feb 10, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/819
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Method and device for digestion of sludge, sludge being transferred stepwise to closed containers (10A, 10B) and gas generated during the digestion process being transferred from said containers (10A, 10B). The sludge is transferred to a first closed space (11A) in a first container (10A) for a first digestion period, and is then after a predetermined period transferred to a second closed space (11B ) in a second container (10B) for a second digestion period. During said first digestion period as well as during said second digestion period the sludge is repeatedly put into movement by tipping said containers (10A, 10B), the flow direction of said sludge being changed to redirect surface material of the sludge to bottom material by the movement of the sludge. Each of said containers (10A, 10B) is provided with an inlet (12) for sludge and a first outlet (13) for gas generated during the digestion period. Said first closed space (11A) and said second closed space (11B) are connected to each other through a valve (16), and internally they are provided with flow redirectors (22) so as to improve the homogenisation of the Said containers (10A, 10B) are designed to be tipped between two …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.