Three types of wastewater, from commercial dyeings containing reactive, disperse and direct dyes were treated using an organic coagulant at pH 5.5 as a first step, with stirring for 5 min. The second step was oxidation by Fenton's reagent (hydrogen peroxide and iron(II) sulfate) at pH 2.5-3 for 30 min. The pH of the solution was then raised to 7.5-8 where coagulation by iron hydroxide took place over 20 min. Finally, sand filtration was performed. The percentage of color removal from treated wastewater was more than 99.00% and the percentage decrease in COD was more than 96.00%.