Abstract Keywords: Mathematical modeling, Anaerobic baffled reactor (ABR), Olive mill oil wastewater and Anaerobic treatment. PERFORMANCE OF AN ANAEROBIC BAFFELD REACTOR FOR OLIVE MILL OIL WASTEWATER TREATMENT M. Saeed Khabbaz*, M. Vossoughi , M. Shakeri Biological and Bioenvironmental Research Center (BBRC), Department of. Chemical Engineering, Sharif University of Technology, Tehran, Iran. saeedkhabbaz2000@yahoo.com The anaerobic baffled reactor (ABR) contains a mixed anaerobic culture segregated into compartments and a novel process with a series of vertical baffles. In this experiment, the influent COD concentration olive oil wastewater was increased from 1000 mg/l to 15000 mg/l but range from 1000 mg/l to 5000 mg/l at a hydraulic retention time of 48 hr was studied in this paper. Maximum removal of olive oil wastewater COD was created in influent COD 3000 mg/l. In low influent COD was seen two minimum of pH in first and 3rd compartment but it was negligible in pH diagram in huge influent COD so diagram of volatile fatty acid (VFA) could response two maximum production of VFA in those two compartments. The substrate loading removal rate was compared with predictions made from the Kincannon-Stover model and the Monod model. Analysis of data indicated that the Kincannon-Stover model could produce the best fit with the experimental results. 9 th Iranian Chemical Engineering Congress Iran University of Science and Technology 23-25 November, 2004