Process and equipment for the indirect drying of sludge, especially for the drying of wastewater sludge

US4742623A · kind A · utility

Assignee

• UHDE GMBH · DE

Inventors

• Peter Meurer · Herdecke, DE
• Heinrich Steuber · Dortmund, DE
• Jurgen Bassler · Dortmund, DE
• Winfried Liebig · Iserlohn, DE
• Ludwig Muhlhaus · Schwerte, DE

Key dates

• Filing date: Sep 12, 1985
• Grant date: May 10, 1988
• Expiry date: Sep 12, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F11/18
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

Referring to process and equipment for the indirect drying of sludge, especially for the drying of wastewater sludge, which may undergo previous mechanical dehydration and/or preheating, it is intended to provide a method that permits utilizing low-value energy for drying purposes while avoiding environmental nuisance. With reference to the process, the problem is solved by drying the sludge under vacuum which is produced by withdrawing the water vapor by means of an injection condenser, the equipment provided for solving the problem comprising a barometric condensor associated with a mechanical sludge dehydrator and at least one sludge drier for indirect drying with an hermetically closed sludge space, the gas dome of the sludge space being connected to the injection condenser through a line for withdrawal of the water vapor.