Abstract: A process has been invented for the purpose of decontaminating aqueous media derived from industrial wastestreams, sanitary wastestreams and natural sources. The aqueous media may contain solids in the form of sediment, soil or sludge. Contaminants include organic materials such as phenols, nitro containing compounds, PCBs, VOCs, PAHs, dyes; inorganic materials, including radionuclides, organometallic materials and microorganisms. Purification of the contaminated media is obtained by using an Electrochemical Peroxidation process (ECP), by which heated hydrogen peroxide is added to an electrolytic cell having oscillating current passing through large surface area sacrificial iron containing electrodes.