ABSTRACT

An air–water interface generator is a proposed apparatus aiming to enhance oxygen transfer by increasing the contact area between air and water. It has been proved that this apparatus could increase the volumetric oxygen transfer coefficient in laboratory scale. Therefore, it is important to study about upscaling in order to apply this apparatus in an actual aeration tank. In this study, the apparatus was investigated for the effect of water volume and water depth on the oxygen transfer process. Referring to the experimental results, an air flow rate approximately 31.5–32.5 m³/hr per m³ of water could achieve satisfactory degrees of both oxygen transfer performance and efficiency. Moreover, an empirical model with ±40 % error was also proposed. From the model, the enhancement of volumetric oxygen transfer coefficient around 30 % could be estimated.

摘要

空气-水界面发生器是一种旨在通过增加空气和水之间的接触面积来增强氧气传递的装置。实践证明，该装置可提高实验室规模的体积氧传递系数。因此，为了将该装置应用到实际的曝气池中，研究放大是很重要的。在这项研究中，该装置研究了水量和水深对氧气转移过程的影响。参考实验结果，空气流速约为每 m ^{3 31.5-32.5 m 3} /hr的水可以达到令人满意的氧气传输性能和效率。此外，还提出了一个误差为±40%的经验模型。根据该模型，可以估计体积氧传递系数提高了 30% 左右。