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Characterization of a tubular electrochemical reactor for the degradation of the commercial diuron herbicide
Environmental Technology ( IF 2.8 ) Pub Date : 2018-10-30 , DOI: 10.1080/09593330.2018.1531941
Danielle Barbosa de Matos 1 , Marcus Paulo Rosa Barbosa 1 , Otávio Monteiro Leite 1 , Juliana Ribeiro Steter 2 , Nayara Silva Lima 1 , Nádia Hortense Torres 1 , Maria Nogueira Marques 3, 4 , Odelsia Leonor Sanchez de Alsina 1, 3 , Eliane Bezerra Cavalcanti 1, 3
Affiliation  

ABSTRACT 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 × 10–6 m3 s–1, 8.33 × 10–6 m3 s–1 and 13.9 × 10–6 m3 s–1. 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 Re0.50 Sc0.33) 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 × 10–3 m3 and an initial concentration of commercial Diuron in 215.83 mg dm–3. 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. GRAPHICAL ABSTRACT

中文翻译:

用于降解商用敌草隆除草剂的管式电化学反应器的表征

摘要 在设计并构建了具有同心电极和切向进料 (RECT) 的电化学反应器后,有必要对其进行表征并研究其性能。停留时间分布 (RTD) 的实验研究是针对 2.78 × 10–6 m3 s–1、8.33 × 10–6 m3 s–1 和 13.9 × 10–6 m3 s–1 的流速进行的。根据从 Pe 数 (0.67–1.52) 获得的值,RECT 拟合为管状,具有很大的分散性。确定的经验相关性 (Sh = 18.16 Re0.50 Sc0.33) 在雷诺数 (Re) 介于 23 和 117 之间的范围内显示层流行为。为了在污水处理中使用 RECT,对 Diuron 进行电化学氧化研究模型分子 (Nortox®) 用于分析具有全回流的封闭系统中的反应器性能。伪一级衰变动力学与敌草隆浓度的衰减有关,在 180 分钟的过程中获得 30% 的矿化,总体积为 4 × 10–3 m3,商业敌草隆的初始浓度为 215.83毫克 dm–3。通过 HPLC-MS 分析鉴定了 11 种副产物,由此可以提出敌草隆降解的途径。从这些观察结果可以推断,所研究的电化学反应器适用于顽固化合物的降解,如商业敌草隆的情况。对所研究的电化学反应器进行一些改变,其他先进的氧化过程,如电芬顿,可以与所研究的系统相关联,以实现更好的转换效率。图形概要 总体积为 4 × 10-3 m3,商业敌草隆的初始浓度为 215.83 mg dm-3。通过 HPLC-MS 分析鉴定了 11 种副产物,由此可以提出敌草隆降解的途径。从这些观察结果可以推断,所研究的电化学反应器适用于顽固化合物的降解,如商业敌草隆的情况。对所研究的电化学反应器进行一些改变,其他先进的氧化过程,如电芬顿,可以与所研究的系统相关联,以实现更好的转换效率。图形概要 总体积为 4 × 10-3 m3,商业敌草隆的初始浓度为 215.83 mg dm-3。通过 HPLC-MS 分析鉴定了 11 种副产物,由此可以提出敌草隆降解的途径。从这些观察结果可以推断,所研究的电化学反应器适用于顽固化合物的降解,如商业敌草隆的情况。对所研究的电化学反应器进行一些改变,其他先进的氧化过程,如电芬顿,可以与所研究的系统相关联,以实现更好的转换效率。图形概要 可以提出降解敌草隆的途径。从这些观察结果可以推断,所研究的电化学反应器适用于顽固化合物的降解,就像商业敌草隆的情况一样。对所研究的电化学反应器进行一些改变,其他先进的氧化过程,如电芬顿,可以与所研究的系统相关联,以实现更好的转换效率。图形概要 可以提出降解敌草隆的途径。从这些观察结果可以推断,所研究的电化学反应器适用于顽固化合物的降解,如商业敌草隆的情况。对所研究的电化学反应器进行一些改变,其他先进的氧化过程,如电芬顿,可以与所研究的系统相关联,以实现更好的转换效率。图形概要 可以与所研究的系统相关联以实现更好的转换效率。图形概要 可以与所研究的系统相关联以实现更好的转换效率。图形概要
更新日期:2018-10-30
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