**4. Objectives and novelty of the research**

This article presents the findings of an experimental research, conducted at the *Department of Agronomy, Section of Microbiology* of the University of Naples Federico II, Naples (Italy), consisting of the analysis of attached mass formation, based on both mixed industrial-municipal and of the effect of high tannery wastewaters COD, along with the endogenous strains. The research aimed at:


Due to the high level of parameterization related to the high number of variables, experimentally tested, the research is considered a step forward to the understanding of the biomass attached growth mechanism.
