ANAEROBIC DIGESTION AND DEWATERING CHARACTERISTICS OF MECHANICAL DISINTEGRATED EXCESS SLUDGE

Julia Kopp1, Dr. Johannes Müller1/2,
Prof. Dr. Norbert Dichtl1, Prof. Dr. Jörg Schwedes2

Institute of Sanitary Engineering1, Institute for Mechanical Process Engineering2,
Post Box 3329, Technical University of Braunschweig, D-38106 Braunschweig, Germany

Abstract:

The research work deals with the influence of disintegration on the anaerobic digestion process of excess sludge and the dewatering characteristics of digested sludge. The mechanical cell disintegration was investigated using four different methods. Methods to describe the degree of cell-disruption were developed and the release of organic components into the sludge water was measured. The best results were optained using a stirred ball mill and a high-pressure homogenizer. The influence of disintegration rate and digestion time on the performance of the anaerobic process and the dewatering characteristics were investigated. The degradation is accelerate and the digestion time can be reduced, especially when using immobilised microorganisms. It could be shown that the mechanical disintegration results in a disruption of particle structure and an increase of polymer-demand. As a result of better anaerobic degradation the density and dewatering results of disintegrated sludges are improved in comparison to non-treated sludges.

 

Keywords:

anaerobic digestion, cell disruption, dewaterability, excess sludge, high-pressure homogenizer, mechanical disintegration, particle size distribution, polymer-demand, pollution of sludge water, stirred ball mill

 

 

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Origin:

J. Kopp, J. Müller, N. Dichtl, J. Schwedes (1997). Anaerobic digestion and dewatering characteristics of mechanical disintegrated excess sludge, Waste water sludge - waste or resource, IAWQ International Conference, Czestochowa, Poland, Juni 1997, Part 2, S. 231-238 und Wat. Sci. Tech. Vol. 36 (11), S. 129-136