الفهرس 
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Abstract
The present work has investigated the performance of the electrocoagulation (BC) in the removal of three different types of dyes (reactive, direct and basic) from synthetic wastewater in a batch agitated vessel. The batch agitated vessel consisted of 45° pitched iron paddle anode and a horizontal iron disc cathode which was fixed in the bottom of the vessel.
The performance was measured through testing the effect of different parameters on the percentage color removal of the three types of dyes. These parameters include:
1. Electrolysis time.
2. Current density.
3. NaCI concentration.
4. Initial dye concentration.
5. Initial solution pH.
6. Paddle rotational speed.
7. Distance between electrodes.
8. Different electrode combination.
These measurements revealed the following results:
1. The study of the effect of current density and electrolyte (NaCl) concentration on the percentage color removal for the three types of dyes showed that percentage color removal increases, as both current density and NaCl concentration increase.
2. Increasing both initial dye concentration and distance between electrodes were proven to decrease the percentage color removal significantly with other operating conditions remaining constant.
3. The pH of the investigated dye solution is within the range of pH corresponding to maximum color removal and no need for pH adjustment before EC treatment unit.
4. It has been found that the rpm has a different effect on percentage color removal of each dye, i,e in case of basic and reactive dyes as rpm increases, percentage color removal increases .whereas in case of direct dye as rpm increases, percentage color removal decreases gradually.
5. FelFe is the optimum electrode combination for the three investigated dyes.
6. Power consumption (PC) is a very important economical parameter in EC. The results showed that as the current density and distance between electrodes increase, PC increases whereas as NaCl concentration increases, PC decreases.
7. A kinetics study has been conducted in order to determine the performance of EC as a design parameter for the reactor in industrial application, and it has been found that the rate of basic dye removal and follows a first-order reaction kinetics.
8. Direct operating cost evaluation of the present EC cell revealed that the removal of 1 kg of reactive-, direct- and basic-dye at the optimum conditions costs 1.72, 1.5 and 1.17 EGP respectively.
9. Treatment of a real textile effluent by the present batch agitated vessel showed promising results in terms of color removal. It has been found that under optimum conditions 95% color removal and 44% COD reduction have been achieved.
10. A complete flow sheet for the treatment of textile wastewater using the present batch agitate.d vesse.l has been suggested.
11. Further studies are recommended to investigate the effect of flow in the percentage color removal and power consumption. Also, a skirmning device is required for the removal of the generated sludge on the surface.