Energy valorization of olive waste water, their sludge and treatmentby methane production

( The anaerobic digestion of the two wastes: olive mill wastewater (OMWW) and sludge from their treatment, is a biological process that allows the production of energy in the form of biogas. Our study is based on the comparison of the methanogenic capacity between the biomethanization of OMWW and the sludge from their treatment. The OMWW were previously treated by electrocoagulation and then adsorption under optimal conditions. The sludge generated by the various treatments, estimated at 50 g/L of OMWW, is in turn treated by anaerobic digestion. The production of methane from the two wastes is accompanied by a reduction in their estimated pollutant load in nonbiodegradable organic matter, polyphenols and fat by 39%, 45% and 39% respectively for olive mill wastewater treatment sludge and 36%, 31%, 39 for olive mill wastewater; i. e. a total pollutant load yield of the OMWW of about 75% to 78%. The total amount of methane produced over 30 days and 49 days respectively by the OMWW and their treatment sludge is 300.7 cm3/L and 889.9cm3/L, equivalent to an energy equivalent of 2.92 Wh/L and 8.72 Wh/L. The application of the anaerobic digestion process to OMWW treatment sludge is efficient and cost-effective for methane production while eliminating its adverse effects on the environment and producing energy.