Manganese Sand Ore Is an Economical and Effective Catalyst for Ozonation of Organic Contaminants in Petrochemical Wastewater
- 375 Downloads
Catalytic ozonation process (COP) is a promising advanced oxidation process for petrochemical wastewater (PCW) treatment. However, the lack of economical and effective catalysts limits its application. Manganese sand ore (MSO) was utilized as a heterogeneous catalyst for ozonation of organic contaminants in PCW in this study. The calcined MSO-assisted COP (cMSO-COP) of aniline exhibited greater degradation than natural MSO-assisted COP or single ozonation process (SOP). The cMSO significantly promoted hydroxyl radical-mediated oxidation, decreased the ozonation activation energy by about 20 %, and doubled the reaction rates in comparison with SOP. The cMSO-COP increased the chemical oxygen demand (COD) removal of PCW twofold relative to SOP. The number of polar organic contaminants decreased by 50 % after cMSO-COP treatment. This study demonstrated the potential use of cMSO for efficient ozonation of petrochemical-derived contaminants at low cost.
KeywordsAniline Petrochemical wastewater Ozonation Catalyst Manganese sand ore
This project was supported in part by the National Natural Science Foundation of China (No. 51209216). C.C. was supported by the scholarship from China Scholarship Council.
- Fu, J. X., Zhang, D. D., An, N., Wang, F., & Jiang, J. H. (2007). Quartz sand/manganese sand mixed layer media for iron and manganese removal and their influencing factors. China Water & Wastewater, 23, 6–10.Google Scholar
- Ikhlaq, A., Brown, D. R., & Kasprzyk-Hordern, B. (2013). Mechanisms of catalytic ozonation: an investigation into superoxide ion radical and hydrogen peroxide formation during catalytic ozonation on alumina and zeolites in water. Applied Catalysis B: Environmental, 129, 437–449.CrossRefGoogle Scholar
- Langlais, B., Reckhow, D. A., & Brink, D. R. (1991). In B. Langlais, D. A. Reckhow, & D. R. Brink (Eds.), Fundamental aspects, in ozone in water treatment: application and engineering. New York: Lewis Publishers.Google Scholar
- Nesbitt, H. W., & Banerjeed, D. (1998). Interpretation of XPS Mn(2p) spectra of Mn oxyhydroxides and constraints on the mechanism of MnO2 precipitation. American Mineralogist, 83, 305–315.Google Scholar