ABSTRACT
Surfactant or surface active agents are slightly soluble in water and cause foaming in wastetreatment plants and also in the surface waters into which the waste effluent is discharged. During aeration ofwastewater, these compounds collect on the surface of the water bubbles and create some problems in wastetreatment.In this study, surfactant, turbidity and COD in the industrial wastewater of the company, Paksan wasstudied. Study was done at pH ranging between 2 and 13 in a pilot scale process.The results showed that ferric chloride has higher efficiency in removal and it is possible to decrease thesurfactant, turbidity and COD.The efficiency of ferric chloride in coagulation process for removal of surfactant, turbidity andCOD from industrial wastewater is better than ALUM, Lime and Ferric Sulfate