Precipitating agent for dephosphatizing effluent

US4267058A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans Kyri · Cologne, DE
• Jurgen Dobbers · Leverkusen, DE

Key dates

• Filing date: Sep 20, 1979
• Grant date: May 12, 1981
• Expiry date: Sep 20, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/906
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A precipitating agent for the dephosphatization of effluent comprising by weight about 5 to 75% of active iron (III) sulphate, about 25 to 95% of active iron (III) oxide and 0 to about 10% of anhydrous magnesium sulphate. Optionally, an alkaline constituent such as the oxide or hydroxide of calcium or magnesium may also be present and dephosphatization is effected at a pH of about 4.5 to about 8.5. Extremely low contents of residual phosphorous can be obtained in the filtrate, a precipitate containing iron and phosphorous settling out cleanly.