Author : Khalid M. Mousa and Hind J. Hadi

Produced water is a huge waste volume of water associated with crude oil production. It is a combination of formation water that is present in the well and the oil well injection water. Produced water consist of oil content, dissolve solid and suspended solids. This research interested on treated produced water results from Iraqi midland oil company from suspended solid contamination and oil content. The production rate of produced oil and produced water at 2015 were 140*103bbl/d and 27.56*103 bbl/d respectively. While the expected produced oil at 2031 were 92.15*103 bbl/d with corresponding produced water of 307.84*103bbl/d. If these huge volumes of produced water disposal to the environment without treated, it will cause many serious environmental problems. Coagulation/ flocculation is a widely-used process in industrial wastewater treatment. It’s a preference in the primary purification processes due to its simplicity operation, efficient and cheap. The experimental tests were done by a jar test and followed ASTM D2035. Three coagulant materials tests were used KlarAid CDP1326 , KlarAid PC1195 and KlarAid IC1176 and Zetag8140 as flocculent material. The first part in experimental study was to determine the best coagulant material, the second part is to determine the optimum coagulant and flocculent dosages. The results showed that KlarAid CDP1326 had superior efficiency in removing turbidity compared with other coagulants at the same conditions and the best turbidity removal was achieved at dose concentration of 70 mg/l of KlarAid CDP1326 and dose concentration of 2.5 mg/l of Zetag8140, were its decreased from 206 NTU to 1.5 NTU, the oil content decreased from 550 mg/l to 54.6 mg/l at same dose of coagulant and flocculent. Statistical analyses of results gave a general equation described the process.

Keywords: Coagulation, Flocculation, Produced water.

Article published in International Journal of Current Engineering and Technology, Vol.6, No.2 (April-2016)