The existing theories incorporated into state-of-the-art activated sludge consensus models indicate that the removal of particulate organics from the liquid in the activated sludge process is a two-step process, being, instantaneous enmeshment of particles and hydrolysis followed by
oxidation. However, experimental observations indicate that the removal of organic particles is not instantaneous and needs more accurate description. This removal process can actually be described as a three-step process, namely, flocculation, hydrolysis and finally oxidation. The principal
objective of this research was to observe and model the kinetics of the removal of suspended particles and colloidal particles. A first order particulate removal expression, based on flocculation, accurately described the removal rates for supernatant suspended solids and colloidal COD. The
rate of reaction for removal of colloidal COD was slow and comparable to that for soluble organic matter.
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