Abstract
In this study, decolorization of wastewater samples taken from the paper industry is investigated using electrochemical peroxidation process. The electrochemical peroxidation process is a part of electrochemical advanced oxidation processes, which is based on the Fenton’s chemical reaction, provided by addition of external H2O2 into reaction cell. In this study, iron is used as anode and graphite as cathode put at the fixed distance of 30 mm in a glass reaction cell. The cell was filled with the solution containing wastewater and sodium chloride as the supporting electrolyte. Factors of the process such as pH, current intensity, hydrogen peroxide concentration, and time of treatment were studied. The results illustrate that all these parameters affect efficiencies of dye removal and chemical oxygen demand (COD) reducing. The maximal removal of wastewater contaminants was achieved under acid (pH 3) condition, with the applied current of 1 A, and hydrogen peroxide concentration of 0.033 M. At these conditions, decolorization process efficiency reached 100 and 83 % of COD removal after 40 minutes of wastewater sample treatment. In addition, the electrical energy consumption for wastewater treatment by electrochemical peroxidation is calculated, showing increase as the current intensity of treatment process was increased. The obtained results suggest that electrochemical peroxidation process can be used for removing dye compounds and chemical oxygen demand (COD) from industrial wastewaters with high removal efficiency.
Highlights
Dyes are widely used in various industries such as paper, textile, leather tanning, and printing industries, causing environmental pollution, especially water pollution
It was found that process factors such as pH, applied current, and concentration of added H2O2 significantly affect decolorization efficiency and chemical oxygen demand (COD) removal from the paper wastewater solution
The electrochemical peroxidation process is facilitated in an acid condition
Summary
Dyes are widely used in various industries such as paper, textile, leather tanning, and printing industries, causing environmental pollution, especially water pollution. Since dye wastewater becomes a problem for the environment, the industry is forced to carry out treatment procedure(s) that can overcome this problem [3,4,5] In this context, the removal of active compounds measured as chemical oxygen demand (COD), and decolorization of wastewater, are considered crucial because many dyes and decomposition products are poisonous. The electrochemical peroxidation process showed a promising perspective in treating several kinds of dyes that contaminated water, causing pollution. In this experimental study, the application of the electrochemical peroxidation process for the decolorization of paper industrial wastewater was explored.
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