Study On Optimization Of Key Structural Parameters Of Settling Tank

With the improvement of living standard, the discharge of domestic sewage and industrial wastewater is becoming larger. The key way to solve this problem is to construct effluent plant. In our country, the construction of effluent plant has received a great success. But the efficiency of the constructed effluent plants in removing pollutant form wastewater is not very satisfied. So, it is in urge require to optimize the design and run of the main structure of the effluent plant.In this paper, based on the analysis and summarization of study results on settling tanks by predecessors, a mathematical model for predicting the velocity field and suspended solids transport in rectangular settling tanks is developed.Using SIMPLE algorithm for a colocated variable arrangement, the variables can be solved. Then, the current field and the consistency distribution are finally simulated. Compare the consistency of outlet in different size tanks, an optimization design can be concluded.The model is applied to study the effect of structural size of settling tanks on the operating efficiency of settling tanks. From the analysis of the solution, it can be seemed that the high of the reaction baffles and the high of tank itself affect the removing pollutant efficiency very much. For the high of the reaction baffles and the high of tank itself determine the circumfluence in the settling tanks, and then affect the removing pollutant efficiency. On the contrary, taking no account of the instance that the sludge full filled in mud hopper, the velocity of inlet has little influence to the removing pollutant efficiency.