Abstract
Through a variety of material screening experiments, Al was selected as the added metal and constituted a multiple micro-electrolysis system of Fe/C/Al. The metal proportion of alloy-structured filler was also analyzed with the best Fe/C/Al ratio of 3:1:1. The regular Fe/C/Al multiple micro-electrolysis fillers were prepared using a high-temperature anaerobic roasting method. The optimum conditions for oil refinery wastewater treated by Fe/C/Al multiple micro-electrolysis were determined to be an initial pH value of 3, reaction time of 80 min, and 0.05 mol/L Na2SO4 additive concentration. The reaction mechanism of the treatment of oil refinery wastewater by Fe/C/Al micro-electrolysis was investigated. The process of the treatment of oil refinery wastewater with multiple micro-electrolysis conforms to the third-order reaction kinetics. The gas chromatography–mass spectrometry (GC–MS) used to analyze the organic compounds of the oil refinery wastewater before and after treatment and the Ultraviolet–visible spectroscopy (UV–VIS) absorption spectrum analyzed the degradation process of organic compounds in oil refinery wastewater. The treatment effect of Fe/C/Al multiple micro-electrolysis was examined in the continuous experiment under the optimum conditions, which showed high organic compound removal and stable treatment efficiency.
Highlights
Oil refinery wastewater is one of the major forms of industrial wastewater, mainly coming from oil refining units, including dewatering and desalting in electric dewatering plants, direct distillation of crude oil, and cracking and distillation of heavy oil
The treatment effect of Fe/C/Al multiple micro-electrolysis was examined in the continuous experiment under the optimum conditions, which showed high organic compound removal and stable treatment efficiency
The effect of micro-electrolysis in oil refinery wastewater treatment and the change of filler after a long continuously-running time were studied by continuous experiments
Summary
Oil refinery wastewater is one of the major forms of industrial wastewater, mainly coming from oil refining units, including dewatering and desalting in electric dewatering plants, direct distillation of crude oil, and cracking and distillation of heavy oil. Oil refining wastewater treatment technology can be divided into physical, chemical, biological, and physicochemical treatment. The research and application of micro-electrolysis technology in refractory biodegradable organic wastewater treatment at home and abroad was popular. The traditional Fe/C micro-electrolysis uses an iron and activated carbon physical mixture as filler; the reaction efficiency is low and has engineering problems, such as easy blocking, hardening, and deactivation during application, which has severe limitations for large-scale applications [30]. The regular multiple micro-electrolysis filler was applied in oil refinery wastewater treatment by batch experiments to explore the influence factors of multiple micro-electrolysis. The effect of micro-electrolysis in oil refinery wastewater treatment and the change of filler after a long continuously-running time were studied by continuous experiments
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