Method and apparatus for increasing sludge concentration in water purification installations
US5098572A · kind A · utility
40Cited by
13References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 21, 1990 |
| Grant date | Mar 24, 1992 |
| Priority date | — |
| Expiry date | Sep 21, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/906
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method of treating water with activated sludge, comprising a process for depolluting said water including a stage in which carbon pollution is oxidized, a nitrification stage which may optionally be associated with a denitrification state and/or a dephosphating stage, and a sludge ageing process. The method further includes a sludge concentration stage, said stage being performed upstream from the sludge ageing stage, said concentration being performed by phase separation using compressed air, e.g. in a flotation tank (3), and the concentrated sludge being recycled via the sludge ageing stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.