Continuous flowing electrocoagulation reactor for efficient removal of azo dyes: Kinetic and isotherm studies of adsorption

The electrocoagulation process is an effective and economical technology for the treatment of industrial wastewater. So, it is particularly important to develop an efficient electrocoagulation reactor. To this end, a novel electrocoagulation reactor is described to effectively remove azo dyes from aqueous solutions utilizing electrocoagulation, in which the electrode plate is bent. Continuous wastewater flows in the reactor will promote faster and more stable growth of flocs This paper took methyl orange as a study object. It was concluded that methyl orange decolorization rate was 92.35% under the optimal conditions while flat electrode under the same conditions of methyl orange decolorization rate was only 58.9%. The results meant that the second-order kinetic model was most in line with the experimental results, which indicated that the chemisorption mechanism controls the adsorption of methyl orange. Furthermore, the results showed that the Langmuir isotherm model was more in line with the experimental results, and showed that the experiment was single-layer adsorption on the adsorbent surface. Under the optimal conditions of the electrocoagulation process, electrode consumption is 0.2376 g, and the electrical energy consumption is 1.5925 KWh m(-3) during a single operation. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

The novel electrocoagulation reactor described in this paper effectively removes azo dyes from aqueous solutions utilizing bend electrode plates. Under optimal conditions, the decolorization rate of methyl orange significantly improves, and both the second-order kinetic model and Langmuir isotherm model are suitable for describing the process.