Dipl.-Ing. Gunter Lehne, Dr.-Ing. Johannes Müller
Institute of Mechanical Process Engineering, Post Box 3329, Technical University of Braunschweig, D-38106 Braunschweig, Germany
The Mechanical disintegration of sewage sludge was investigated using different ultrasonic homogenizers. The influence of a mechanical disintegration on the particle size was investigated. The particle size analyse can not describe the cell disruption and the release of organic material to the sludge water. Two biochemical methods were developed for these phenomena. One of the parameters provides information about the disruption of micro-organisms the other one gives information about the release of organic material. The influence of the energy intensity on the disintegration of excess sludge was investigated. Further investigations had to detect the influence of the solid content on the disintegration results. For sludge with a higher solid content better results in terms of energy consumption could be achieved. A comparison of the results of different methods of sludge disintegration shows that the investigated ultrasonic homogenizers are inferior to a high pressure homogenizer and a stirred ball mill in terms of energy consumption.
G. Lehne, J. Müller (1999). The influence of energy consumption on the sewage sludge disintegration, in: Tiehm, A., Neis, U. (ed.) Ultrasound in Environmental Engineering, TU Hamburg- Harburg Reports on Sanitary Engineering 25, GFEU- Verlag, pp. 205-215, ISBN 3-930400-23-5