Post-Graduated Program on Process Engineering, Tiradentes University, Aracaju, Brazil.
Faculty of Exact Sciences and Technology - FACET, Universidade Federal da Grande Dourados, Dourados, Brazil.
Environ Technol. 2020 Apr;41(10):1307-1321. doi: 10.1080/09593330.2018.1531941. Epub 2018 Oct 30.
After designing and constructing an electrochemical reactor with concentric electrodes and tangential feed (RECT), it is necessary to characterize it and to study its performance. The experimental study of the residence time distribution (RTD) was conducted for flow rates of 2.78 × 10 m s, 8.33 × 10 m s and 13.9 × 10 m s. According to the values obtained from the Pe number (0.67-1.52), the RECT fits as tubular with great dispersion. The determined empirical correlation (Sh = 18.16 Re Sc) showed a laminar flow behavior in the range of Reynolds number (Re) between 23 and 117. In order to use RECT in effluent treatment, an electrochemical oxidation study of the Diuron model molecule (Nortox) was performed to analyze reactor performance in a closed system with total reflux. A decay kinetics of pseudo-first order was associated with the decay of the concentration of diuron and 30% mineralization in 180 min of process were obtained, having a total volume of 4 × 10 m and an initial concentration of commercial Diuron in 215.83 mg dm. Eleven by-products were identified by HPLC-MS analysis and, from this, it was possible to propose a route of degradation of the diuron. From these observations, it can be inferred that the studied electrochemical reactor had applicability in the degradation of recalcitrant compounds, as is the case of commercial diuron. Make some changes in the electrochemical reactor studied and other advanced oxidative processes, such as electro-Fenton, can be associated with the studied system to achieve a better conversion efficiency.
在设计和构建具有同心电极和切向进料的电化学反应器（RECT）之后，有必要对其进行表征并研究其性能。对于流速为 2.78×10 m/s、8.33×10 m/s 和 13.9×10 m/s 进行了停留时间分布（RTD）的实验研究。根据 Pe 数（0.67-1.52）的值，RECT 适合具有大分散性的管式。确定的经验相关性（Sh=18.16 Re Sc）表明，在雷诺数（Re）范围为 23 到 117 之间，存在层流行为。为了在废水处理中使用 RECT，对 Diuron 模型分子（Nortox）进行了电化学氧化研究，以分析在总回流的封闭系统中反应器的性能。与 Diuron 浓度衰减相关的拟一级衰减动力学和在 180 分钟的过程中获得 30%的矿化度，具有 4×10 m 的总体积和商业 Diuron 的初始浓度为 215.83 mg dm。通过 HPLC-MS 分析鉴定了 11 种副产物，并由此提出了 Diuron 的降解途径。从这些观察结果可以推断，所研究的电化学反应器在降解难处理化合物方面具有适用性，就像商业 Diuron 一样。对所研究的电化学反应器进行一些更改，并将其他高级氧化工艺（如电芬顿）与所研究的系统相关联，可以实现更好的转化效率。
