| As one content of project of sewage treatment engineering to be carried out at the small town in western China supported by the Holland,and also component of project——"Subzone of Sewage Treatment Single Pool and Optimum Allocation of Energy"——belonging to doctor fund project of Ministry of Education,this piece of research measures and compares AIRE-O2 and rotary plate aerators's capability of aeration and impetus .Research indicates that rotary plate aerator's performance in upper portion of water is better than AIRE-O2 aerator,while the latter can make DO distributed uniformly on sections and its impetus isn't good. The survey of similar Orbal oxidation ditch is focused on the velocity distribution of concentration ellipse shape and concentric circles shape represented in oxidation ditches, analyzes the rationality of its device allocation and the problems shown in velocity profile, proposes the improved treatment. Three dimensional k –εturbulence mathematical model was used to simulate the flow field of rounded Orbal oxidation ditch ,and moving mesh technology was used to simulate the power sources of plate running in the ditch.By comparison on the theoretical calculation data and test result ,it was indicated that the result of mathematic simulation is reasonable. Furthermore , detailed analysis was made on the flow pattern in the ditch ,and then the measures of optimization and improvement were proposed for current design from the view of hydrodynamics.It offer a shortcut for the flow pattern simulation of oxidation ditche in the future and opens up a road for solving the actual project problem.
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