De-watering process
US6805802B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Jul 25, 2002 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Aug 8, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/928
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Process muds are de-watered by the addition of high clay alumina. The clay is mixed with plant sludges or muds so as to cause flocculation of the solid particles, and separating the water from the solid materials, as by filtration. Various polymers and/or alum process residues can be added as well. In addition to de-watering plant sludges, this method also reduces color, and reduces the total organic carbon as well as heavy metals, from the filtered water. This permits disposal of the water to public waterways with no additional treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.