光电转盘反应器处理染料废水数学模型

Mathematical Model of Dye Wastewater Treatment with Thin Film Photoelectrocatalytic Reactors

相较于传统的A/O法、生物处理法等水污染治理技术,光电催化降解技术在处理废水时具有处理彻底、水力停留时间短、降解完全等巨大优势。基于此提出了具有动态光阳极的转盘式光电液膜反应器(RPEC),通过将催化剂负载在转盘上,利用转盘的转动加强废水的传质。在转盘表面形成几十微米的液膜,激发光直接透过该液膜即可照射到光阳极催化剂表面,解决了光源利用率的问题,同时可以通过外加偏压来减少光生电子与空穴的简单复合,提高了处理效率。该文在RPEC反应动力学方程的基础上,综合考虑光强、外加偏压、转盘转速、初始浓度、催化剂用量以及溶液pH值等因素对反应过程的影响,运用MAT-LAB软件对转盘转动的反应过程进行模拟迭代计算,建立迭代模型,绘制出降解曲线。试验证明计算结果与试验数据有较好吻合,从而建立了不同条件下转盘式光电催化降解废水的降解模型,为实际工业应用提供指导意义。

Contrast to traditional water treatments like aerobic, anaerobic and biological treatment, the photoelectrocatalytic treatment has many advantages as short HRT, complete degradation, etc. For above, the TiO2/Ti rotating disk photoelectrocatalytic reactor （RPEC） was proposed. By loading the catalyst on the rotating disks, the transfer of the wastewater can be enhanced and form about tens of microns liquid film on the surface of the disks through which the catalyst can be irradiated by the excitation light. This helps to solve the problem of utilization of light and reduce the simple compound of electrons and holes by adding bias voltage, and improve the efficiency eventually.Based on the RPEC kinetic equation and considering the influence facts including light intensity, bias voltage, wheel speed, initial concentration, catalyst dosage and pH, the aim of this work is to set up the degradation curve by using iterative calculation in MATLAB software to simulate the rotating process. It is proved that the degradation curves match the experiments coincidently and provide the guidance for the pracital industry applications.