The olive mill waste water (OMWW) are effluents issues issued from the extraction of olive oil, these effluents are cloudy-looking liquids with a reddish-brown color, their pH varies from 4 to 5. They are very rich in polyphenols, which cause causes many environmental problems, such as water pollution, Currently, on an industrial scale, there is no reliable, and efficient, and less expensive technique for OMWW treatment., indeed, OMWW are evaporated in watertight basins or discharged into watercourses. several Several techniques have been studied to treat these industrial effluents,. The objective of our this work was to compare these studies to conclude formulate the recommendations that can be adopted for an effective and cheaper treatment of these effluents which constitute a major environmental problem for water resources,. iIndeed, it can be concluded that it’s it is very difficult to de treat OMWW by conventionnels conventional methods due to its non-biodegradability and high cost of the others methods like distillation and oxidations are very expensive. In the end, we have it was concluded that for a better OMWW treatment, it is necessary to start firstly by the adsorption of phenolic compounds which are responsible for the non-biodegradability of OMWW while using cheaper adsorbents namely clays, bioadsorbnats bio-adsorbents or apatites, then dilute the OMWW with domestic wastewater, .indeed, tThe dilution of OMWW by urban wastewater leads to good mineralization of organic matter by enriching the medium with microorganisms, which facilitates the elimination of the organic load and then we use the usual techniques as a plant filter or Aactive sludge for mixture treatment.