Abstract
This work deals with the electrocoagulation (EC) process for an organic dye removal. The chosen organic dye is C.I. disperse yellow 3 (DY) which is used in textile industry. Experiments were performed in batch mode using Al electrodes and for comparison purposes Fe electrodes. The experimental set-up was composed of 1 L beaker, two identical electrodes which are separated 2 cm from each other. The main operating parameters influencing EC process were examined such as pH, supporting electrolyte concentration C NaCl , current density i , and DY concentration. High performance EC process was shown during 45 min for 200 mg/L dye concentration at i = 350 A m -2 (applied voltage 12 V) and C NaCl = 1 g L -1 reaching 98 % for pHs 3 and 10 and 99 % for pH 6. After 10 min, DY was also efficiently removed (86 %) showing that EC process may be conveniently applied for textile industry wastewater treatment. EC using Fe electrodes exhibited slightly lower performance comparing EC using Al electrodes.
Highlights
The main problem of access to safe drinking water is continuous pollution of water resources by agriculture, urban waste and industry
The aim of this work was to perform bleaching EC tests on dye synthetic solutions using EC process and evaluate its performance based on certain key parameters
We find that the rate of reduction of the dye increased with time until a yield of 96.28 % in the case of iron electrodes (Figure 12)
Summary
The main problem of access to safe drinking water is continuous pollution of water resources by agriculture, urban waste and industry. DISPERSE YELLOW 3 can be toxic to the environment [1,2,3,4] Their presence in aquatic systems, even at low concentrations, is very visible. Several biological, physical and chemical methods are used for the treatment of industrial effluents with different efficeincies [1315] Electrochemical technologies, such as electrocoagulation technique (EC), seem to be well adapted to the textile industry wastewaters treatment [16,17,18,19,20,21,22]. This work is devoted to the study of the EC process for bleaching synthetic water containing an azo dye, C.I. disperse yellow 3 (DY), used in the Algerian textile industry and the assessment of its performance versus certain operating parameters.
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