Patent · US Active

Method for treating sewage sludge and wastewater treatment plant

US9556049B2 · kind B2 · utility

1Cited by

1References

12Claims

0Family size

Assignee

CNP—TECHNOLOGY WATER AND BIOSOLIDS GMBH · DE

Inventors

Wolfgang Ewert · Hamburg, DE
Michael Sievers · Poughkeepsie, US
Hinnerk Bormann · Vienenburg, DE

Key dates

Filing date	Sep 10, 2012
Grant date	Jan 31, 2017
Priority date	—
Expiry date	May 9, 2033

Classification

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

Abstract

The invention describes a method for treating sewage sludge through the treatment steps of hydrolyzing (2) the sewage sludge (1) and digesting (11) the hydrolyzed sewage sludge (10), which has undergone hydrolysis (2), for the anaerobic treatment of the sewage sludge (1), and through the step of separating phosphate from the at least partially treated sewage sludge (3). Phosphate is separated after the treatment step of hydrolyzing (2) and before the treatment step of digesting (11) the hydrolyzed sewage sludge (3), wherein the sewage sludge (10), without the phosphate portion separated in the phosphate separation step, is fed to the anaerobic treatment performed through digestion (11).

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