Abstract: “Population growth and depletion of high quality fresh water supplies have led to an increased interest in wastewater reuse to augment potable water supplies either directly or indirectly so this paper presents a simple experimental set-up was used to study the treatability aspect of synthetic waste water. Three types of systems: i) conventional anaerobic baffled reactor (ABR (A)), ii) anaerobic baffled reactor with sponge bio-film (ABR (B)), iii) anaerobic baffled reactor with fiber bio-film (ABR (C)), where experimented under different COD (0-5000 mg/l) in the first steps, with flow rate 38 l/d and pH value 8.5. pH effect on treatability was also investigated. The main objective of this study was to investigate the behavior of three reactors and verify the use of bio-film in improving treatability, to promote theses the use of two types of bio-film sponge and fiber. Many significant factors were considered such as: temperatures, number of baffled in reactor, shape baffled and location”

Keywords: Anaerobic digestion, high strength wastewater treatment, anaerobic baffled reactor,sponge media, fiber media, and Chemical Oxygen Demand (COD).