In this paper, a preliminary study on treatment of reactive dye wastewater by iron–carbon micro-electrolysis was performed. The decolorization efficiency of Reactive Remazol Yellow 3GL dye by activated carbon adsorption and micro-electrolysis methods was compared. The results show that the decolorization of reactive dye using iron-carbon micro-electrolysis can be effective. The effect of Fe/C ratio (1:1; 3:1; 5:1) was studied in treatment of wastewater;the removal efficiency respectively is 75.7; 83.9 and 71.6% after 180 minutes reaction time at room temperature.
Wastewater from the dye industry has high toxicity and contaminant concentration. The dye wastewater usually containsstrong color and complex chemical substances such as aromatic structures,making treatment difficult. In dye industry, dyes can be classified as reactive dyes, disperse dyes, direct dyes, acid dyes, and so on. Reactive dyes, formed by the combination of azo-based chromophores and reactive groups such as OH, SH, NH2, are commonly used in textile industries because of their favorable characteristics of bright color, water-fastness, and simple application techniques with low energy consumption [1]. Although several methods have been proposed for treatment of dye wastewater, either through physical, chemical or biological processes, some limitations still exist [2]. Biological treatment is often used but it is difficult to treat reactive dye wastewater because of microbial toxicity and mass transfer limitation [3]. Physical and chemical methods such as chemical coagulation/flocculation and adsorption [4, 5], oxidation [6, 7], irradiation [8] are used for decolorization of dyes. However, these treatment methods are costly ornot suitable for dye wastewater and the technologies are not readily available in developing countries