Abstract: There is a method for the mechanical disintegration of biogenic sewage sludge, for which the sewage sludge, in an initial state, has microorganisms in the form of cells and a solid, which is formed essentially from aggregates of cells and suspended materials, and for which a disintegration process (3, 4) causes a destruction of aggregates and a destruction of cells. It is desirable to improve the disintegration. This is achieved in that, in a first disintegration step 3, primary destruction of aggregates and, in a subsequent, separate second disintegration step 4, primary destruction of cells is caused. Due to the use of two separate disintegration processes, an appreciable improvement in the disintegration is achieved, since fewer aggregates and more cells are supplied to the second disintegration process. The increased destruction of cells brings about the improvement in the disintegration.

Abstract: There is a method for which a sewage sludge is permitted to flow from a first connecting region 21 to a treatment device, which works with rotation and stresses the sewage sludge with severing parts, and from the treatment device to a second connecting region 1. It is desirable to improve the continuity to the operation and to attain a decisive increase in the disintegration. This is achieved by using a rapidly rotating pipe-head formation, which has a head 6 with radial openings 10 and radial wings 4, for the mechanical disintegration of biogenic sewage sludge. The edges of the openings exert a shear effect, while the wings exert an impact effect and the combination of these two actions, in conjunction with the rapid rotation, brings about the improvement in the disintegration.