Background: Olive oil is a vital component in the Lebanese diet and Lebanon is known for its contribution to the global production of olive oil. During the process of olive oil extraction, a brownish black effluent is also produced called Olive mill waste water (OMWW). OMWW is disposed into the environment causing serious polluting problems harming the aquatic and terrestrial organisms and reaching the underground water as well. OMWW contains considerable amount of phenolic compounds with antioxidant properties. In Lebanon, no study did extract and assess the levels of these phenolic compounds ...