Method and apparatus for drying sewage sludge

US4974335A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dietmar Bege · Erlangen, DE
• Siegfried Meininger · Schongau, DE

Key dates

• Filing date: May 24, 1989
• Grant date: Dec 4, 1990
• Expiry date: May 24, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method and apparatus for drying sewage sludge includes diverting steam escaping during the drying of the sewage sludge and feeding the steam to a compressor. Thermal energy of the compressed and therefore heated steam is supplied to the sewage sludge to be dried through a heat exchanger system. Condensate is drawn off from the heat exchanger system and collected. Thermal energy of the condensate is supplied to the sewage sludge prior to the drying for reinforcing a preliminary degassing.