Patent · US Expired

Process for working up waste water containing phosphorus

US4399037A · kind A · utility

3Cited by

4References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Herbert Diskowski · Lechenich, DE
Johannes Krause · Kornwestheim, DE
Dietrich Mandelkow · Hürth, DE

Key dates

Filing date	Oct 5, 1981
Grant date	Aug 16, 1983
Priority date	—
Expiry date	Oct 5, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/906
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

The invention relates to a process for working up phosphorus-containing waste water by subjecting it to filtration with the use of a filter aid in a centrifugal filter. To this end, waste water with a temperature of at least 46.degree. C. and a pH-value within the range 0.5 to 4.0 is introduced into the centrifugal filter and fitrate coming from the centrifugal filter is introduced into a calming zone and separated therein within an average period of 10 to 60 minutes into yellow phosphorus and water containing 1 to 30 ppm of phosphorus. Water overflowing from the calming zone is treated with an oxidant and the waste water so freed from phosphorus is reacted with a neutralizing agent.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.