Abstract A modified rotating packed disc contactor (RPDC) with the maximum working volume of 65 liter is designed for biological waste water treatment. A hollow disc with radial vanes mounted on the disc was a modified design of this contactor. Stimulus-response experiments were conducted in the contactor to understand liquid mixing behavior under different operating conditions. The recycle stream was also used in the operation of the contactor. Experiments were conducted for different number of discs, rotational speeds and recycle ratios. The disc design and recycle ratio had marked influence on the mixing behavior. An increase in disc rotation and recycle ratio produced a well-mixed flow behavior. Moreover, the surface area available in the RPDC was about 4 times more than the surface area available in a standard rotating biological contactor (RBC) operating at similar conditions. A mathematical model was developed for the flow behavior under recycle and a good agreement was found between the model and experimental results.

中文翻译：

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改进的旋转填料盘接触器中的停留时间分布研究：数学建模和验证

摘要 设计了一种最大工作容积为65升的改进型旋转填料圆盘接触器（RPDC）用于生物废水处理。带有安装在圆盘上的径向叶片的空心圆盘是该接触器的改进设计。在接触器中进行了刺激响应实验，以了解不同操作条件下的液体混合行为。再循环流也用于接触器的操作。对不同数量的圆盘、转速和回收率进行了实验。圆盘设计和回收率对混合行为有显着影响。圆盘旋转和循环比的增加产生了混合良好的流动行为。而且，RPDC 中可用的表面积大约是在类似条件下运行的标准旋转生物接触器 (RBC) 中可用表面积的 4 倍。建立了循环下流动行为的数学模型，模型与实验结果吻合良好。