Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approach
In this study, a computational fluid dynamics (CFD) model integrated with activated sludge model 3 (ASM3), which is based on the tandem reactor model (tank-in-series (TIS) method), is proposed to simulate the oxygen mass transfer process and biochemical reaction process in an oxidation ditch. The si...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
|
| Series: | Desalination and Water Treatment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398625001225 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849471376415522816 |
|---|---|
| author | Rongrong Miao Han Cui Yuzhen Shi Baoxiu Guo Yanqiong Chen Zhengbo Yang Chengbo Chang Wanyue Xu |
| author_facet | Rongrong Miao Han Cui Yuzhen Shi Baoxiu Guo Yanqiong Chen Zhengbo Yang Chengbo Chang Wanyue Xu |
| author_sort | Rongrong Miao |
| collection | DOAJ |
| description | In this study, a computational fluid dynamics (CFD) model integrated with activated sludge model 3 (ASM3), which is based on the tandem reactor model (tank-in-series (TIS) method), is proposed to simulate the oxygen mass transfer process and biochemical reaction process in an oxidation ditch. The simulation results are consistent with the quality of the effluent from the actual water plant. On the basis of the coupled model, the effects of aeration volume and bubble size distribution (BSD) on dissolved oxygen (DO) were simulated. The increase in bubble diameter led to a gradual decrease in the volumetric mass transfer coefficient in the aeration area, whereas the volumetric mass transfer coefficient in the nonaeration area did not change significantly. A reduction in the bubble diameter could improve the oxygen transfer efficiency and reduce energy consumption. Moreover, the removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), and ammonia nitrogen (NH3-N) differed under different aeration amounts. However, increasing the excess aeration amount did not significantly improve their removal effects, mainly constrained by the activated sludge microbial population and its related kinetic factors. The above results indicate that the CFD-ASM3 coupled model can effectively simulate the effects of the aeration amount on the dissolved oxygen content and effluent water quality during oxidation ditch operation. |
| format | Article |
| id | doaj-art-e0f126e6b47b4a8e8d65e8911724dad8 |
| institution | Kabale University |
| issn | 1944-3986 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Desalination and Water Treatment |
| spelling | doaj-art-e0f126e6b47b4a8e8d65e8911724dad82025-08-20T03:24:51ZengElsevierDesalination and Water Treatment1944-39862025-04-0132210110610.1016/j.dwt.2025.101106Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approachRongrong Miao0Han Cui1Yuzhen Shi2Baoxiu Guo3Yanqiong Chen4Zhengbo Yang5Chengbo Chang6Wanyue Xu7Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaCorresponding author.; Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaIn this study, a computational fluid dynamics (CFD) model integrated with activated sludge model 3 (ASM3), which is based on the tandem reactor model (tank-in-series (TIS) method), is proposed to simulate the oxygen mass transfer process and biochemical reaction process in an oxidation ditch. The simulation results are consistent with the quality of the effluent from the actual water plant. On the basis of the coupled model, the effects of aeration volume and bubble size distribution (BSD) on dissolved oxygen (DO) were simulated. The increase in bubble diameter led to a gradual decrease in the volumetric mass transfer coefficient in the aeration area, whereas the volumetric mass transfer coefficient in the nonaeration area did not change significantly. A reduction in the bubble diameter could improve the oxygen transfer efficiency and reduce energy consumption. Moreover, the removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), and ammonia nitrogen (NH3-N) differed under different aeration amounts. However, increasing the excess aeration amount did not significantly improve their removal effects, mainly constrained by the activated sludge microbial population and its related kinetic factors. The above results indicate that the CFD-ASM3 coupled model can effectively simulate the effects of the aeration amount on the dissolved oxygen content and effluent water quality during oxidation ditch operation.http://www.sciencedirect.com/science/article/pii/S1944398625001225Activated Sludge Model 3Bubble Size DistributionComputational Fluid DynamicsOxidation DitchOxygenTandem reactor model |
| spellingShingle | Rongrong Miao Han Cui Yuzhen Shi Baoxiu Guo Yanqiong Chen Zhengbo Yang Chengbo Chang Wanyue Xu Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approach Desalination and Water Treatment Activated Sludge Model 3 Bubble Size Distribution Computational Fluid Dynamics Oxidation Ditch Oxygen Tandem reactor model |
| title | Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approach |
| title_full | Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approach |
| title_fullStr | Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approach |
| title_full_unstemmed | Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approach |
| title_short | Numerical simulation of the two-phase flow and pollutant concentration changes in an oxidation ditch: A computational fluid dynamics and activated sludge model 3 approach |
| title_sort | numerical simulation of the two phase flow and pollutant concentration changes in an oxidation ditch a computational fluid dynamics and activated sludge model 3 approach |
| topic | Activated Sludge Model 3 Bubble Size Distribution Computational Fluid Dynamics Oxidation Ditch Oxygen Tandem reactor model |
| url | http://www.sciencedirect.com/science/article/pii/S1944398625001225 |
| work_keys_str_mv | AT rongrongmiao numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach AT hancui numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach AT yuzhenshi numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach AT baoxiuguo numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach AT yanqiongchen numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach AT zhengboyang numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach AT chengbochang numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach AT wanyuexu numericalsimulationofthetwophaseflowandpollutantconcentrationchangesinanoxidationditchacomputationalfluiddynamicsandactivatedsludgemodel3approach |