Removal of phosphorous from waste water
US4043910A · kind A · utility
5Cited by
13References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1976 |
| Grant date | Aug 23, 1977 |
| Priority date | — |
| Expiry date | Jun 3, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/906
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Phosphate is removed from an aqueous medium by adding inorganic coagulant followed by a cationic polyelectrolyte which is a water-soluble quaternary ammonium salt of a high molecular weight copolymer of acrylamide and an alkylaminoalkyl ester of acrylic or methacrylic acid. The process is of particular value in reducing the phosphate content of sewage effluent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.