This investigation focus on the application of surfactant enhanced aquifer remediation (SEAR) technology using modified surfactant to improve the remediation of olive oil mill wastewater (OOMW), a new kind of surfactant was used which is a new extended surfactants sodium polypropylene oxides sulphate of the type (branched hydrocarbon chain)- (propoxyle group)-(sulphate). A modelled three dimensional phase diagram using phenol as a model compound for the phenolic compounds in the OOMW was determined and the amounts of the surfactant needed to extract the phenol can be determined using the three-dimensional phase behaviour of the phenol, water and the proposed surfactant. 1H-NMR and direct photometric method was used for the detection of the efficiency of the surfactant in the remediation of OOMW.