Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 25, Pages 25060-25070Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2551-8
Keywords
Nitrobenzene; Ozone; Titanium ions; Acidic wastewater; Degradation mechanisms; Rotating packed bed
Categories
Funding
- Natural Science Foundations of China [U1610106]
- Shanxi excellent talent science and technology innovation project [201705D211011]
- Specialized Research Fund for Sanjin Scholars Program of Shanxi Province [201707]
- North University of China Fund for Distinguished Young Scholars [201701]
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The rotating packed bed (RPB) as a continuous flow reactor performs very well in degradation of nitrobenzene wastewater. In this study, acidic nitrobenzene wastewater was degraded using ozone (O-3) combined with hydrogen peroxide and titanium ions (Ti(IV)/H2O2/O-3) or using only H2O2/O-3 in a RPB. The degradation efficiency of nitrobenzene by Ti(IV)/H2O2/O-3 is roughly 16.84% higher than that by H2O2/O-3, and it reaches as high as 94.64% in 30 min at a H2O2/O-3 molar ratio of 0.48. It is also found that the degradation efficiency of nitrobenzene is significantly affected by the high gravity factor, H2O2/O-3 molar ratio, and Ti(IV) concentration, and it reaches a maximum at a high gravity factor of 40, a Ti(IV) concentration of 0.50 mmol/L, a pH of 4.0, a H2O2/O-3 molar ratio of 0.48, a liquid flow rate of 120 L/h, and an initial nitrobenzene concentration of 1.22 mmol/L. Both direct ozonation and indirect ozonation are involved in the reaction of O-3 with organic pollutants. The indirect ozonation due to the addition of different amounts of tert-butanol (center dot OH scavenger) in the system accounts for 84.31% of the degradation efficiency of nitrobenzene, indicating that the nitrobenzene is dominantly oxidized by center dot OH generated in the RPB-Ti(IV)/H2O2/O-3 process. Furthermore, the possible oxidative degradation mechanisms are also proposed to better understand the role of RPB in the removal of pollutants.
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