摘要：Highlights. (a) The Fe/Al/C micro-electrolysis filler was prepared and characterized. (b) The technology was applied in the treatment of refining wastewater and the optimum experi- mental parameters were determined. (c) The organic matter of the refining wastewater was removed, the biodegradability was enhanced and the biological toxicity was greatly re- duced. (d) The mechanism of the treatment of wastewater by Fe/C/Al micro-electrolysis was inves- tigated. Micro-electrolysis (ME) technology is an ef- fective pretreatment technique for refractory organic wastewater. Herein, the Fe/Al/C ME technology was applied for refining wastewater treatment, and thefiller was prepared and characterized. The optimum experimental parameters of refining wastewater treated by Fe/AI/C ME were obtained: the initial pH value was 3, the dosage of Na2SO4 was 0.05 mo/L. the reaction time was 80 min, and non-aerated con- dition. The application effect was proved in continu- ously operated experiment under optimum experi- mental parameters. The results showed that most of the organic matter of the refining wastewater was re- moved. the biodegradability was greatly enhanced and the biological toxicity was greatly reduced Moreover, the main mechanism of Fe/AlC ME pre- treating refining wastewater had been discussed. Thecatalytic redox reaction of P-nitrophenol by Fe/Al/C ME was studied by cyclic voltammetry, which con- firmed the catalytic degradation effects of organic compounds by Fe/Al/C ME. Additionally, EDX analysis showed that Al and Fe were corroded and its effluent formed a mixture of flocculants compris- ing ferrous hydroxide and aluminum hydroxide un- der alkaline conditions in the Fe/Al/C ME reaction process. Through IR analysis, it was found that the substances adsorbed by the mixture of flocculants were mainly alkanes, olefins, phenols, and aromatichvdrocarbons. Therefore, the mixture of flocculantshas a good coagulation and adsorption effect on the organic substances in the refinery wastewater.
