Abstract:In order to deeply explore floc growth characteristics and structural improvement approaches, the process of floc breakage was simulated by computer based on a simplified breakage mode, and then simulation results were used to analyze the evolution of floc size and structure during reformation after breakage in different hydrodynamic conditions. The results showed that compared to restructure of particles far away from floc mass center, floc compactness is highly dependent on the spatial distribution of particles in the vicinity of its mass center; floc fragments formed after breakage, with a relatively small size and compact structure, benefit particles to enter into their interiors or be uniformly arranged arround them, bringing about restructure of particles nearby the mass center, and thus modifying floc structure. Moreover, a fractal growth model of floc was established, and according to the model, some suggestion was proposed for optimizing the operation of flocculation.