Method for deodorizing sludge with metal salt and tannin extract together, deodorized sludge, and use thereof
US11952298B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2021 |
| Grant date | Apr 9, 2024 |
| Priority date | — |
| Expiry date | Oct 15, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for deodorizing sludge with a metal salt and a tannin extract together, deodorized sludge, and use thereof are provided. The present invention provides a sludge deodorization technology that has high treatment efficiency, environmental friendliness, and low investment costs, and satisfies harmless requirements of subsequent resource utilization such as incineration, pyrolysis, or carbonization. Characterized by containing abundant phenolic hydroxyl groups, the tannin extract is used as a multidentate ligand to undergo a complexation reaction with metal ions, which reduces bioavailability of proteins and other macromolecules, and effectively inhibits production of low-volatile sulfides, thereby significantly deodorizing the sludge during standing and combustion. The whole deodorization process of the present invention is simple and feasible, is flexible in operation, requires no complex and harsh reaction conditions or expensive equipment, has low operating costs, and can be used as a supporting pretreatment technology for resource utilization of sludge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.