Related Experiment Video
Updated: Aug 15, 2026

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Kinetics of removal of particulate chemical oxygen demand in the activated-sludge process
Jose A Jimenez1, Enrique J La Motta, Denny S Parker
1Department of Civil and Environmental Engineering, University of New Orleans, Louisiana, USA. Jjimenez@BrwnCald.com
Abstract:
The existing theories incorporated to state-of-the-art, activated-sludge-consensus models indicate that the removal of particulate substrate from the liquid in the activated-sludge process is a two-step process: instantaneous enmeshment of particles and hydrolysis followed by oxidation. However, experimental observations indicate that the removal of particles is not instantaneous and needs a more accurate description. This removal process can actually be described as a three-step process: flocculation, hydrolysis, and 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 chemical oxygen demand (COD). The rate of reaction for removal of colloidal COD was slow and comparable to that for soluble organic matter.
More Related Videos
Related Concept Videos
Biological Treatment of Effluent and Waste Water
Bioreactor Controls-II
Microbial Wastewater Treatment
Microbial Bioremediation of Pesticides
Catalysis
Coagulation

