Degradation of polycyclic aromatic hydrocarbons (PAHs) in textile dyeing sludge by O-3/H2O2 treatment

作者：Ning, Xun'an^*; Shen, Lingzhi; Sun, Jian; Lin, Chaoping; Zhang, Yaping; Yang, Zuoyi; Chen, Shujun

来源：RSC Advances, 2015, 5(48): 38021-38029.

DOI：10.1039/c5ra03307a

• CONTAMINATED SOILS
• HYDROGEN-PEROXIDE
• OZONE OXIDATION
• FENTONS REAGENT
• WATER
• OZONATION
• KINETICS
• DEWATERABILITY
• DECOMPOSITION
• REMOVAL

The degradation of polycyclic aromatic hydrocarbons (PAHs) in textile dyeing sludge by O-3/H2O2 treatment was investigated. Fluorene (Fl), phenanthrene (Ph), anthracene (An) and dibenz[a, h] anthracene (DBA) were selected to represent typical PAHs. The effect of radical inhibitors, H2O2, O-3 flow rate, pH and reaction time on the degradation of the four types of PAHs were examined to determine the optimal conditions for degradation and to clarify the mechanism(s) of PAHs degradation. The results indicated that the combined O-3/H2O2 treatment resulted in high removal rates of the selected PAHs: 89% for Fl, 66% for Ph, 71% for An and 81% for DBA. These results correspond to the optimal conditions of an O-3 flow rate of 0.4 L min(-1), a H2O2 concentration of 0.60 mol L-1, a reaction time of 15 min and pH 7. The removal rate (within 30 min) increased by 5% for Fl, 27% for Ph, 21% for An and 5% for DBA through the addition of H2O2 to the O-3 process. The O-3 flow rate, reaction time and pH were the key parameters affecting PAH degradation with multiple interacting factors (p < 0.05) by the O-3/H2O2 treatment. The degradation of the PAHs can be fitted well by pseudo-first-order kinetics (R-2 = 0.9656). The combined O-3/H2O2 treatment is demonstrated to be an efficient approach for the degradation of PAHs in textile dyeing sludge.

• 出版日期2015
• 单位广东工业大学