Related Experiment Video
Updated: Jun 29, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
First-order hydrothermal oxidation kinetics of digested sludge compared with raw sludge.
1Department of Civil Engineering, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates.
Hydrothermal oxidation kinetics of digested and raw sludge are nearly identical, even with different organic compositions. Acetic acid removal dominates the process, consistent with first-order kinetics models.
Area of Science:
- Environmental Engineering
- Chemical Kinetics
- Wastewater Treatment
Background:
- Sludge treatment is crucial for wastewater management.
- Understanding oxidation kinetics aids in optimizing treatment processes.
Purpose of the Study:
- To assess hydrothermal oxidation kinetics of digested sludge.
- To compare digested sludge kinetics with raw sludge.
- To develop kinetic models for sludge treatment.
Main Methods:
- Hydrothermal oxidation at subcritical and supercritical temperatures (250-460°C).
- Analysis of particulate (PCOD) and soluble (SCOD) chemical oxygen demand.
- Batch and continuous-flow experiments to determine reaction kinetics.
Main Results:
- Digested and raw sludge exhibited nearly identical oxidation kinetics (75-97% COD removal).
- Acetic acid removal, an intermediate, was the rate-limiting step.
- Kinetic models accurately represented COD and PCOD removal and SCOD dynamics.
Conclusions:
- Sludge type has minimal impact on hydrothermal oxidation kinetics under studied conditions.
- Acetic acid kinetics are key to modeling sludge oxidation.
- Developed models are effective for predicting hydrothermal oxidation of sludge.
More Related Videos
15:19Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
06:11Measuring Biomethane Potential of Food Scrap Waste Anaerobically Co-Digested with Waste-Activated Sludge Using Respirometry
Published on: April 26, 2024
Related Concept Videos
Biological Treatment of Effluent and Waste Water
Microbial Bioremediation of Hydrocarbons
Microbial Wastewater Treatment