Abstract
In this study, the performance of the electrocoagulation (EC) process was evaluated for its capability to remove color, total organic carbon (TOC), chemical oxygen demand (COD) using aluminium electrodes. Response surface methodology based on Box-Behnken design was used to optimize different operating conditions of the processes. The interaction effects of four independent variables such as dye concentration, applied current density, electrolysis time, and pH on the percentage of COD, TOC, and color removal were investigated by the EC process. ANOVA analysis was made to examine the significance of input parameters and their interaction effect on responses. At the optimum operating conditions, 89% of color, 47% of TOC, and 76% of COD removal rate were achieved using the EC process. Different research works have been reported on the treatment of textile wastewater by the EC process. However, these researches vary regarding working conditions such as dye type, concentration, current density, pH, electrolysis time, and electrode type. Also, most literature focuses mainly on the performance of the technology. However, it is also important to investigate the economic aspect, removal mechanism, and mineralization study. Thus, economic analyses, mineralization, kinetic, sludge characterization studies of the technology were performed.
Highlights
The textile industry is one of the largest consumers of dyestuffs, chemicals, and water that are used during different steps of textile processing procedures
The result at the optimum values indicates that the EC process is very effective in removing the effluent containing vivizol red 3BS 150% reactive dyestuff
89% color and 76% chemical oxygen demand (COD) removals efficiency were achieved by EC at 25 min electrolysis time and other optimum working conditions of an initial dye concentration 600 mg/L, current density 32.95 mA cmÀ2, and initial pH of 3
Summary
The textile industry is one of the largest consumers of dyestuffs, chemicals, and water that are used during different steps of textile processing procedures. As a result, they generate a huge amount of wastewaters, which are unsuitable for further application (Periyasamy et al 2018). The huge amount of wastewater produced from textile dyeing industries has become a significant environmental concern. Among the other textile dyestuffs, reactive dyes are the most common dyes used in the cotton textile industry (Haque & Islam 2015). At the stages of the textile dyeing process, almost 30% of the dyestuffs are remaining unbound with the cotton cellulose fibers (Chavana 2004)
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