Organic Coagulants are heavy metal free chemicals based of dicyandiamide polymers (decolorant), polyamines, polyadmac and hybrid mixtures. They are used as coagulants in industrial wastewater treatment plants to remove contaminants from wastewater. Their application ensure to reach appropriate limit values in AKM, COD, color and other required parameters of wastewater, improve water quality and thus release to discharge of clean water to receiving environment. The use of coagulants contributes to increase the efficiency of flocculants used in sludge dewatering in treatment systems.