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Electrocoagulation and electrochemical advanced oxidation processes in oily wastewater treatment

With the growth of industrial production, the amount of oily wastewater generated is increasing worldwide. In these effluents, oil and grease along with other constituents such as heavy metals, cyanides, etc. are classified as hazardous wastes and must be disposed of before discharge to the environment or their reuse. In recent years, there has been increased research on new wastewater treatment technologies that would not only increase the treatment efficiency, but also the economic efficiency, environmental sustainability and social acceptability. A recent approach to wastewater treatment is the application of electrochemical processes such as electrocoagulation (EC) and electrochemical advanced oxidation processes (EAOP), among which the electro-Fenton process (EF) stands out, which is a combination of Fenton's reagent chemistry and electrochemistry. The EF process oxidizes organic materials using electrochemically generated reactive oxygen species such as chlorine, hypochlorite, hydrogen peroxide and ozone. In this work, stainless steel, iron and aluminum electrodes were used. In order to investigate the efficiency of the EF process, experiments were carried out using wastewater from oil and grease separators to which diesel was added to increase the concentration of mineral oil. The tests showed that the EF process can achieve the removal efficiency of mineral oil up to 98% and of COD up to 82%. Additional tests were performed with increased loads in raw wastewater by addition of used engine oil and emulsion from metallurgical industry. The results obtained showed a removal efficiency of mineral oil up to 99, 9% and of COD up to 67%.

Electrocoagulation, Electrochemical advanced oxidation processes, oily wastewater

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