Particle size Distribution Information on particle size is of importance in assessing the effectiveness of treatment processes(e.g, secondary sedimentation, effluent filtration and effluent disinfection The biological conversion rate of these particles dependent on size The methods used most commonly to study and quantify the particles in wastewater are serial filtration, electronic particle counting, and microscopic observationParticle Size Distribution Information on particle size is of importance in assessing the effectiveness of treatment processes (e.g., secondary sedimentation, effluent filtration and effluent disinfection). The biological conversion rate of these particles is dependent on size. The methods used most commonly to study and quantify the particles in wastewater are serial filtration, electronic particle counting, and microscopic observation