RESULTS
The difficulty in the research of the type we are dealing with evidently is that the granulation-process can not be quantified because granulation is a dynamic process without a clear starting point. Nevertheless it turned out that the beginning of the granulation-process could be identified rather well under laboratory conditions by the appearance within a period of a few days of macroscopic, distinct and differently coloured sludge-agglomerates. However it should be kept in mind