Abstract
The effluents generated by textile industries are extremely toxic and dangerous to the environment. In fact, new treatment technologies for recalcitrant effluents have been tested for high dye removal efficiency. Among these technologies, electrocoagulation has been highly promising, due to its excellent results coupled with a low operating cost. This study evaluated the electrocoagulation/electroflotation process efficiency on the removal of Eriochrome Black textile dye from aqueous solution. All the experiments were carried out using aluminum electrodes due to their availability and low cost. The parameters investigated during the experiment were: electrolysis experiment time, NaCl concentration, aqueous solution pH and electric potential. In this context, the best results considering the operational parameters studied were electric potential of 7 V, values of pH low to neutral (2–7) and NaCl concentration of 2 g L−1. It has also been observed that a time of 55 min of electrolysis is sufficient for a satisfactory result, reaching a color removal efficiency of 98.5%.
Highlights
Synthetic dyes from the textile industry are used on a large scale, generating several problems in the environment (Forgacs et al 2004; Gupta and Suhas 2009)
Gas bubbles—O2 and H2—are formed in parallel with the electrolysis of the water molecules, and the electroflotation is coupled to the electrocoagulation process
There is a direct relationship between the amount of aluminum ions dissolved and the time of electrolysis
Summary
Synthetic dyes from the textile industry are used on a large scale, generating several problems in the environment (Forgacs et al 2004; Gupta and Suhas 2009). The textile sector stands out due to the high demand of water required in its processes and the consequent generation of large volumes of effluents, and it is estimated that in the production of cotton fabric, for example, water consumption may range from 100 to 300 L Kg−1 of cotton fabric (Arslan et al 2016). When these dyes are dumped without proper treatment in aqueous effluents, they immediately interfere with the aquatic ecosystem in several ways (Joshi et al 2004). The chemical reactions established for this process are: Al(s) → Al3(a+q) + 3e−
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
