Beneficiated sludge
US6733558B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 2001 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | Jul 21, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/40
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A beneficiated sludge solids composition comprising digested municipal sewage sludge, ammonium sulfate, and superphosphoric acid. Alternatively, a beneficiated sludge solids composition comprising digested municipal sewage sludge, ammonium sulfate, mineral acid and phosphate salt. The constituents of the beneficiated sludge solids composition of the invention act synergistically to increase economic value through increased fertilization values of nitrogen and phosphorous, decreased flammability and autocombustibility, decreased ammonia evolution on drying and decreased corrosibility. The beneficiated sludge solids composition is capable of being produced in present sewage treatment facilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.