Water treatment apparatus
US6805796B2 · kind B2 · utility
24Cited by
9References
19Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Feb 13, 2001 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Apr 17, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/441
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A water treatment apparatus according to the present invention includes a plurality of composite reverse osmosis membrane modules arranged in multi-stages, each of the modules including a porous support and a polyamide skin layer formed on the porous support. In this apparatus, the module at the final stage is supplied with some of permeated water obtained from at least one module preceding the module at the final-stage, and a rest of the permeated water is discharged from or recovered in the apparatus along with permeated water obtained from the final-stage module.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.