The effects of particle size distribution on the settleability of CSOs pollutants

Over the past decades, flocculation and/or sedimentation processes have bee n adopted to remove pollutants from CSOs. It has been learned that major fa ctors affecting settlement of pollutants are the particle size distribution , their settling velocities and their specific gravity. It is, therefore, a good idea to analyze the particle size distribution and settleability of C SOs pollutants in order to develop details in designing a process. Discusse d in this study are pollutant characteristics of CSOs such as particle size distribution and settleability of pollutants. The power law function is ap plied and is found to be an effective and reliable index for expressing the particle size distribution of pollutants in CSOs. Based on the particle si ze spectrum analysis, the tendency toward settling and simultaneous floccul ation-settling phenomenon of CSOs pollutants is described. Based on the reg ression analysis it is observed that the derived constants of curves repres enting settling velocity profile are proportional to the initial concentrat ion of particles and to the beta -values of power law distributions. It is also revealed that the simultaneous flocculation-settling processes are eff ectively described by the changes of the average particle diameter and of t he beta -values of power law distributions.