Patent · US Expired

Process for utilizing liquid manure material

US6387272B2 · kind B2 · utility

8Cited by

1References

14Claims

0Family size

Assignee

Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

Thomas Hirth · Bogen, DE
Rainer Schweppe · Karlsruhe, DE
Kai Höhn · Geesthacht, DE

Key dates

Filing date	Jul 6, 1999
Grant date	May 14, 2002
Priority date	—
Expiry date	Jul 6, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/903
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

A process for utilizing the material of ammonium-containing effluent which contains further soluble constituents and, possible additional solids, comprising:a) optionally separating off the solids,b) concentrating the substantially solids-free ammonium-containing effluent to give an aqueous concentrate having an increased content of ammonium and additional soluble constituents, with simultaneous recovery of substantially ammonium-free pure water,c) precipitating ammonium as magnesium ammonium phosphate from the ammonium-containing aqueous concentrate, andd) separating off precipitated magnesium ammonium phosphate with recovery of substantially ammonium-free residual concentrate which at least partially contains the additional soluble constituents.

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