氧化塘水力特性模型研究

Model Study on Hydrodynamic Characteristic of Oxidation Pond

氧化塘是一种被广泛应用且运行费用较低的污水处理设施,其流型有多种模型可供采用,但主要模型参数纵向扩散系数 (D)和扩散因素(d)均难准确预测,为了满足这些模型的通用性就需要建立所需参数的预测方程。通过氧化塘模型研究,利用示踪实验技术测定了水力逗留时间分布,提出了一种计算氧化塘模型纵向扩散系数D的经验公式,为求取扩散因素d或扩散传质准数 Pe提供了简便方法。用所得经验公式求得胜利油田桩西联采油废水氧化塘Pe值,与实测值较好吻合,相对偏差为6．61％。

Oxidation pond was a wastewater treatment method featured with low operating cost, and it was applied widely. Various fluid models adopted for it, but the main model parameters such as axial dispersion coefficient and diffusion factor were difficult to be exactly predicted. To meet these models＇ generality, the predicted equations of needed parameters were established. Through the study on the oxidation pond, hydraulic retention time distribution was tested by means of tracer eaperiments, the experienced formula used to calculate the axial dispersion coefficient was put forward. It provided a simple method to determine the diffusion factor or peclet number. The experienced formula was used to predict the Pe of oim - gathering/water - treating oxidation pond of Zhuangxi , Shengli oil field. The predicted resuits well matched with the practical value and the relative error was 6.61% .