Investigation of color and COD removal from textile wastewaters byselected coagulation agent

The chemical coagulation methods have been using successfully for treatment of textile wastewaters which have high color, COD and TOC contents. The coagulants have adsorption capability and constitute hydroxide compounds with dissolved substances in colored wastewaters.The greatest advantage of the coagulation method is to decrease further COD values than the other methods. The disadvantages of this method are the high cost of the chemicals and high volume of slurry. If the sludge could not be disposed properlythe land around the treatment plant will adsorb the chemical content of the waste.The chemical coagulation method examinedfor removal of color and COD from textile dye containing wastewater.The cost of treatment was decreased by treatment of the slurry to provide reuse coagulantagent. The 88.7% of COD and 96.9% of color removal were occurred with the optimum pH of 11.5.