Slurry dewatering and conversion of biosolids to a renewable fuel
USRE45869E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2014 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Dec 8, 2034 |
Classification
- Technology area (CPC —)General
Abstract
In the processes for treating municipal sewage and storm water containing biosolids to discharge standards, biosolids, even after dewatering, contain typically about 80% water bound in the dead cells of the biosolids, which gives biosolids a negative heating value. It can be incinerated only at the expense of purchased fuel. Biosolids are heated to a temperature at which their cell structure is destroyed and, preferably, at which carbon dioxide is split off to lower the oxygen content of the biosolids. The resulting char is not hydrophilic, and it can be efficiently dewatered and/or dried and is a viable renewable fuel. This renewable fuel can be supplemented by also charging conventional biomass (yard and crop waste, etc.) in the same or in parallel facilities. Similarly, non-renewable hydrophilic fuels can be so processed in conjunction with the processing of biosolids to further augment the energy supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.