Numerical Simulation Of The Secondary Settling Tank

The second sedimentation tank is an important part in the waste water treatment. Its bodily form and size is reasonable or not will affect straightly the flow state and the sedimentation. The paper studies and calculated the flow field and the concentration field with the Fluent software mostly, and analyses the flow state and the sedimentation of the second sedimentation tank on the change of its structure, and discusses the shape-optimization and the improvement of the sedimentation.The following conclusions are obtained: 1. we should take the turbulent model on the flow field calculation about the second sedimentation tank; 2. the turbulent flow field of the second sedimentation tank under the three dimension condition is not necessary, two-dimensional is reasonable; 3. change the structure and the size of the second sedimentation tank reasonably will improve the flow state and the sedimentation.The study on the paper provides references about the shape-optimization of the second sedimentation tank in practical projects, and improve the design level.However, in the future, we can analysis and demonstration the study of the paper by experimentation. We also should perfect the shape-optimization and the size of the second sedimentation tank.