A novel "wastes-treat-wastes" technology: Role and potential of spent fluid catalytic cracking catalyst assisted ozonation of petrochemical wastewater. (1st April 2015)

• Record Type: Journal Article
• Authors: Chen, Chunmao; Yu, Ji; Yoza, Brandon A.; Li, Qing X.; Wang, Gang
• Is Part Of: Journal of environmental management. Volume 152(2015)
• Page Start: 58
• Page End: 65
• Publication Date: 2015-04-01
• Subjects: Wastes-treat-wastes -- Spent catalyst -- Petrochemical wastewater -- Catalytic ozonation; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2015.01.022
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Catalytic ozonation is a promising wastewater treatment technology. However, the high cost of the catalyst hinders its application. A novel "wastes-treat-wastes" technology was developed to reuse spent fluid catalytic cracking catalysts (sFCCc) for the ozonation of petrochemical wastewater in this study. Multivalent vanadium (V 4+ and V 5+ ), iron (Fe 2+ and Fe 3+ ) and nickel (Ni 2+ ) oxides that are distributed on the surface of sFCCc and poisoned FCC catalysts are the catalytic components for ozonation. The sFCCc assisted catalytic ozonation (sFCCc-O) of nitrobenzene indicated that the sFCCc significantly promoted hydroxyl radical mediated oxidation. The degradation rate constant of nitrobenzene in sFCCc-O (0.0794 min −1 at 298 K) was approximately doubled in comparison with that in single ozonation (0.0362 min −1 at 298 K). The sFCCc-O of petrochemical wastewater increased chemical oxygen demand removal efficiency by three-fold relative to single ozonation. The number of oxygen-containing (Ox ) polar contaminants in the effluent (253) from sFCCc-O treatment decreased to about 70% of the initial wastewater (353). The increased oxygen/carbon atomic ratio and decreased number of Ox polar contaminants indicated a high degree of degradation. The present study showed the role and potential of sFCCc for catalytic ozonation of petrochemical wastewater, particularly in an advantage of the cost-effectiveness through "wastes-treat-wastes". Highlights: A "wastes-treat-wastes" technology was developed for petrochemical industries. Petrochemical wastewater was ozonated with activated spent FCC catalysts. The metal oxides poisoned FCC catalysts are active components of ozonation. Multivalent metal oxides promoted OH generation and OH mediated oxidation. This technology was cost-effective and environmentally friendly.