Method and apparatus for recycling sewage sludge utilizing spent water-softener lime
US6887389B2 · kind B2 · utility
10Cited by
11References
2Claims
0Family size
Inventor
Key dates
| Filing date | Oct 23, 2002 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Nov 6, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/919
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method and apparatus are disclosed for mixing sewage sludge with spent water-softener lime in a ratio of approximately 10:1 on a wet basis. The mixture is introduced to a rotary pre-dryer kiln and a rotary combuster kiln to kill pathogens. An ash by-product and gases are thereby produced. The ash by-product can be disposed of at much less cost or can be incorporated in a variety of applications such as an aggregate substitute.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.