State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Oil and Gas Pollution Control, China University of Petroleum, Beijing 102249, China; Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA.
State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Oil and Gas Pollution Control, China University of Petroleum, Beijing 102249, China.
J Environ Manage. 2015 Apr 1;152:58-65. doi: 10.1016/j.jenvman.2015.01.022. Epub 2015 Jan 21.
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".
催化臭氧化是一种很有前途的废水处理技术。然而，催化剂的高成本阻碍了它的应用。本研究开发了一种新颖的“废物处理废物”技术，以再利用废流化催化裂化催化剂（sFCCc）来臭氧化石化废水。多价钒（V(4+) 和 V(5+)）、铁（Fe(2+) 和 Fe(3+)）和镍（Ni(2+)）氧化物分布在 sFCCc 和中毒的 FCC 催化剂表面，是臭氧化的催化成分。sFCCc 辅助催化臭氧化（sFCCc-O）硝基苯表明，sFCCc 显著促进了羟基自由基介导的氧化。sFCCc-O 中硝基苯的降解速率常数（298 K 时为 0.0794 min(-1)）比单独臭氧化（298 K 时为 0.0362 min(-1)）约提高了一倍。与单独臭氧化相比，石化废水的 sFCCc-O 增加了化学需氧量去除效率三倍。sFCCc-O 处理后废水中的含氧（Ox）极性污染物数量（253）减少到初始废水（353）的约 70%。增加的氧/碳原子比和减少的 Ox 极性污染物数量表明了高度的降解。本研究表明了 sFCCc 在石化废水催化臭氧化中的作用和潜力，特别是在通过“废物处理废物”实现成本效益方面具有优势。
