Method of treatment of sludges with size-adjusted carbon
US3933634A · kind A · utility
Inventor
Key dates
| Filing date | Aug 9, 1972 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | Aug 9, 1992 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/5236
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for concentrating and separating solids from solid/liquid mixtures in the treatment of sewage sludge, which comprises incorporating into such sludge 2 to 10 % by weight of fine dust coal or lignite having such a size distribution that 30 to 50 % by weight of the whole particles have a finer size not greater than 100 mesh and 70 to 50 % by weight of the whole particles have a coarser size exceeding 100 mesh, mixing them under agitation, allowing the resulting admixture to stand still to separate the coal-containing concentrated sludge from the supernatant liquor, and if desired, filtering the coal-containing concentrated sludge to remove water therefrom; and a continuous dehydration apparatus which is used effectively for practice of said process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.