Patent · US Expired

Process for the biological treatment of waste water

US4582607A · kind A · utility

10Cited by

7References

7Claims

0Family size

Assignee

Fried Krupp · DE

Inventors

Siegfried Kiese · Dortmund, DE
Ulrich Scheffler · Essen, DE

Key dates

Filing date	Mar 1, 1985
Grant date	Apr 15, 1986
Priority date	—
Expiry date	Mar 1, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W10/10
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

A method is disclosed for the biological aerobic purification of waste waters wherein a temperature from 30.degree. to 60.degree. C. is maintained in a first process stage and a temperature from 20.degree. to 40.degree. C. is maintained in a second process stage, with the temperature in the first process stage always being higher than the temperature in the second process stage and wherein a part of the activated sludge of the second process stage, after being seperated, is returned to the first process stage. The process provides a high decomposition output and produces an activated sludge which exhibits good sedimentation behavior.

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