基于CFD-ASM1耦合模型的氧化沟流态优化与降耗增效OA

To address the challenges of uneven flow patterns,sludge deposition,and low carbon source utilization efficiency in oxidation ditch processes,this study investigated the Phase I and Phase III oxidation ditches of a wastewater treatment plant in Yongkang City.A coupled Computational Fluid Dynamics(CFD)and Activated Sludge Model No.1(ASM1)approach was employed to systematically optimize propeller agitator configuration,suspended sludge management,and carbon source addition strategy.The Realizable k-ε turbulence model and the Mixture multiphase flow mode were adopted,while the Takacs settling equation was used to quantify sludge deposition risk.Additionally,User-Defined Functions(UDFs)were implemented to achieve dynamic coupling between the flow field and biochemical reactions.The results demonstrated that in the Phase I oxidation ditch,adjusting the installation angle of the anoxic zone agitator from 18° to 15° improved sludge distribution uniformity by 9.1%.In the Phase III oxidation ditch,the addition of recirculation mixers increased the internal recirculation velocity by 27.7%.Regarding the carbon source dosing optimization,the multi-point dosing strategy in high-turbulence zones increased the total nitrogen removal rate by up to 18.1%,while reducing carbon resource consumption by 21.5%year-on-year.This study provides a theoretical basis and technical support for digital transformation and refined operation of oxidation ditch processes.