Catalytic ozonation of petroleum refinery wastewater utilizing Mn-Fe-Cu/Al2O 3 catalyst
2015
Chen, Chunmao | Yoza, Brandon A. | Wang, Yandan | Wang, Ping | Li, Qing X. | Guo, Shaohui | Yan, Guangxu
There is of great interest to develop an economic and high-efficient catalytic ozonation system (COS) for the treatment of biologically refractory wastewaters. Applications of COS require options of commercially feasible catalysts. Experiments in the present study were designed to prepare and investigate a novel manganese–iron–copper oxide-supported alumina-assisted COS (Mn–Fe–Cu/Al₂O₃–COS) for the pretreatment of petroleum refinery wastewater. The highly dispersed composite metal oxides on the catalyst surface greatly promoted the performance of catalytic ozonation. Hydroxyl radical mediated oxidation is a dominant reaction in Mn–Fe–Cu/Al₂O₃–COS. Mn–Fe–Cu/Al₂O₃–COS enhanced COD removal by 32.7 % compared with a single ozonation system and by 8–16 % compared with Mn–Fe/Al₂O₃–COS, Mn–Cu/Al₂O₃–COS, and Fe–Cu/Al₂O₃–COS. The O/C and H/C ratios of oxygen-containing polar compounds significantly increased after catalytic ozonation, and the biodegradability of petroleum refinery wastewater was significantly improved. This study illustrates potential applications of Mn–Fe–Cu/Al₂O₃–COS for pretreatment of biologically refractory wastewaters.
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