Electrochemical production and use of free chlorine for pollutant removal: an experimental design approach

Author(s)

Antonelli, Raissa ^[1] ; de Araujo, Karla Santos ^[2] ; Pires, Ricardo Francisco ^[2] ; de Toledo Fornazari, Ana Luiza ^[2] ; Granato, Ana Claudia ^{[2, 1]} ; Pointer Malpass, Geoffroy Roger ^{[2, 1]}

Affiliation

^[1] Univ Fed Triangulo Mineiro, Dept Engn Quim, Ave Dr Randolfo Borges Jr 1250, BR-38064200 Uberaba - Brazil

^[2] Univ Fed Triangulo Mineiro, Programa Mestrado Profiss Inovacao Tecnol, Ave Dr Randolfo Borges Jr 1250, BR-38064200 Uberaba - Brazil

• Document type: Journal article
• Source: ENVIRONMENTAL TECHNOLOGY; v. 40, n. 3, p. 321-328, 2019.
• Web of Science Citations: 0

Abstract

The present paper presents the study of (1) the optimization of electrochemical-free chlorine production using an experimental design approach, and (2) the application of the optimum conditions obtained for the application in photo-assisted electrochemical degradation of simulated textile effluent. In the experimental design the influence of inter-electrode gap, pH, NaCl concentration and current was considered. It was observed that the four variables studied are significant for the process, with NaCl concentration and current being the most significant variables for free chlorine production. The maximum free chlorine production was obtained at a current of 2.33A and NaCl concentrations in 0.96moldm(-3). The application of the optimized conditions with simultaneous UV irradiation resulted in up to 83.1% Total Organic Carbon removal and 100% of colour removal over 180min of electrolysis. The results indicate that a systematic (statistical) approach to the electrochemical treatment of pollutants can save time and reagents. (AU)

• FAPESP's process: 14/02739-6 - Water reuse in irrigation and aquaculture: inactivation of pharmaceuticals and endocrine disruptors by solar photo-fenton
• Grantee: Eduardo Bessa Azevedo
• Support type: Regular Research Grants