Catalytic ozonation of petroleum refinery wastewater utilizing Mn-Fe-Cu/Al2O3 catalyst
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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.
KeywordsPetroleum refinery wastewater Catalytic ozonation Wastewater treatment Metal oxide catalyst
This project was supported in part by the National Natural Science Foundation of China (No. 51209216). C. Chen was supported by the scholarship from China Scholarship Council.
Conflict of interest
The authors have declared that there is no conflict of interests that existed.
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