Oxidative gasification of olive mill wastewater as a biomass source in supercritical water: Effects on gasification yield and biofuel composition

► Oxidative gasification of olive mill wastewater is investigated in supercritical water. ► The effect of reaction temperature, O2 and feed concentration on gasification yield and gas composition is examined. ► Oxygen increases the gasification yield, however, decreases the biofuel content in the gas effluent. ► The most favorable conditions is obtained as 550-600 °C using low O2 and feed TOC concentrations for the reaction time of 30 s.