Ballasting digestor covers
US4391705A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1981 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | May 29, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/801
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A digestor includes a tank and an inverted dish-shaped cover, the lower end of which extends into sludge contained within the tank. The cover is ballasted by a number of ballast members which resemble tubs and which are integrally formed of concrete. Each ballast member is mounted with its cavity facing upwardly so that the ballast cavities automatically fill with sludge upon start-up of the digestor. When partially surfaced above the sludge, the predetermined total weight of sludge in the ballast members causes a substantial increase in the pressure exerted by the cover on the contained gas than would be exerted by the cover and unfilled ballast members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.