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Abstract
Electrocoagulation has been successfully used to treat a variety of industrial wastewater. The goal is to form flocks of metal hydroxides within the effiuent to be cleaned by electro-dissolution of soluble anodes.
The present work deals with the removal of reactive dyes from waste effiuents by electrocoagulation using an electrolytic cell which is consisted of a rectangular Plexiglas container of dimensions 14*18*22cm equipped with two parallel verti.cal Ai electrodes (14*18cm) with electrode separation of 12cm. The electrodes were connected to a digital DC power supply (20V) with a multi-range ammeter connected in series and a voltammeter connected in parallel with the cell.
The percentage of color removal was studied under different conditions by varying the following parameters:
1. Electrolysis time, from 5 to 35 minutes.
2. Electrolyte (NaCI ) concentration, from 10 to 50gIL.
3. Current density, from 0.0046 to 0.0229 Afcm2.
4. Initial dye (Drimarine Yellow K2R) concentration from 25 to 125 ppm.
5. PH value, from 3 to 9.
The study indicated that increasing the electrolysis time increased the percentage of color removal till electrolysis time of 30 minutes, further increase in electrolysis time decrease the percentage of color removal. Color removal increased also by increasing NaCI concentration and by increasing the current density at fixed pH value and it decreased by increasing the dye concentration. It is found that the pH value of the solution had no significant effiuence on the percentage of dye removal i.n the pH range of3-9.
The results indicated that the maximum percentage of color removal of 99.8% is achieved after 30 minutes at current density of 0.0137 Ncm2, pH of 9; NaCI concentration is fixed at 20 gIL and initial dye concentration of25ppm.
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