The treatment of the urban sewage and the Organic industrial wastewater has been transformed from removing of the organics to the Removal of organic matter and nitrogen, phosphorus. According to the deficiency of the Traditional wastewater treatment process,the micro-pressure inner loop reactor is put forward to solve the Anaerobic, anoxic and aerobic environmental issues in this paper. Aiming at the newly development of the micro-pressure inner loop reactor, based on the methods of Computational Fluid Dynamics, using the methods of computational fluid dynamics, By analyzing the velocity distribution field, flow lines, the gas volume fraction and other factors, the result shows that the reactor Meets the actual needs of the project, and provides a theoretical basis for practical engineering equipment.

The construction of bridges and other structures across the river will affect the flood discharge capacity and local water potential of the river.Based on navier-Stokes equation of MIKE21FM hydrodynamic module, this paper carries out two-dimensional numerical simulation of part of Shixi River. By optimizing the grid near the piers to reduce the difference brought by the terrain generalized grid of the real river, it simulates and analyzes the length of the curve of yong-high and Yong-water under different flood frequencies,the Nash-Sutcliffe efficiency coefficient and relative error analysis are used to verify the rationality of the results. The simulation results can accurately reflect the real changes of river water level, It provides a theoretical basis for flood impact analysis.