الفهرس 
Introduction
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Abstract
the treatment of industrial wastewater technology are varies from simpler technology to the more advanced technology . this study was based on evaluation of the possibility of applying saponification/coagulation followed by sedimentation to reduce the oils from refinery plants oily wastewaters. ferrous sulfate, ferric chloride and alum were tested by jar test analysis as coagulants to determine the best removal % of cod. the optimum dose for saponification. was found as 10 ml of 1 molar naoh/1 solution . the comparison between the 3 different types of treatment methods (sponification followed by sedimentation , sponification followed by cogulation with sedimentation and cogulation followed by sedimentation) indicated that ferric chloride with 40 mg/l dosage is more efficient for coagulation and sedimentation treatment after saponification of refinery plants wastewaters wich removal efficiency reach about 84 %