Abstract
The colour removal of synthetic Rhodamine B (RhB) wastewater by using the electrocoagulation (EC) process in batch mode utilizing commercially available iron plates as electrodes was investigated. The colour removal (%) was calculated for the EC process by taking into account the effects of several factors such as pHi, current density, RhB concentration and temperature. When NaCl was utilized as the electrolyte for EC, the efficiency of colour removal was enhanced. At the optimal experimental conditions (pHi 7.0, 100 A/m2, 50 ppm RhB concentration, 30 minutes, 30 oC and 0.075 M NaCl concentration), the colour removal (%) was 87.27 %. The negative values of ΔH° and ΔS° and ΔG° indicate that the adsorption process was spontaneous in nature and unfavorable at higher temperatures. The electrical energy consumption was assessed to be 2.44 KWh/m3. Characterization of the sludge was also carried out.
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