Degradation of polycyclic aromatic hydrocarbons (PAHs) in textile dyeing sludge with ultrasound and Fenton processes: Effect of system parameters and synergistic effect study.
Degradation of polycyclic aromatic hydrocarbons (PAHs) in textile dyeing sludge with ultrasound and Fenton processes: Effect of system parameters and synergistic effect study.
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DOI：
10.1016/j.jhazmat.2015.12.047
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发表时间：
2016-04
影响因子：
13.6
通讯作者：
Meiqing Lin;Xun-an Ning;T. An;Jian-Hao Zhang;Changmin Chen;Yaowei Ke;Yujie Wang;Yaping Zhang-Yaping-Zhan
中科院分区：
文献类型：
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作者：
Meiqing Lin;Xun-an Ning;T. An;Jian-Hao Zhang;Changmin Chen;Yaowei Ke;Yujie Wang;Yaping Zhang-Yaping-Zhan
为建立高效氧化降解印染污泥中多环芳烃（PAHs）的工艺，研究了超声、芬顿和超声-芬顿组合工艺中各操作参数对降解效果的影响。结果表明，超声强度为1.80 W/cm 3，H2 O2和Fe 2+投加量均为140 mmol/L，pH值为3时，对多环芳烃的降解效果较好。高分子量多环芳烃的降解效率接近甚至高于低分子量多环芳烃。在30 min内，对16种多环芳烃的降解率最高，依次为：芬顿（83.5%）>超声波-芬顿（75.5%）>超声波（45.5%）;在60 min内，降解率依次为：超声波-芬顿（73.0%）>芬顿（70.3%）>超声波（41.4%）。在氧化过程中，由于污泥的破坏，多余的多环芳烃从污泥的胞内物质和空腔中释放出来。污泥中的其他有机物也会抑制多环芳烃的降解。超声-芬顿联合工艺不仅在污泥表面而且在污泥内部都表现出比超声-芬顿工艺更好的处理效果。
To establish an efficient oxidation process for the degradation of polycyclic aromatic hydrocarbons (PAHs) in textile dyeing sludge, the effects of various operating parameters were optimized during the ultrasound process, Fenton process and the combined ultrasound–Fenton process. The results showed that the ultrasonic density of 1.80 w/cm3, both H2O2and Fe2+dosages of 140 mmol/L and pH 3 were favorable conditions for the degradation of PAHs. The degradation efficiency of high molecular weight PAHs was close to or even higher than that of light molecular weight PAHs. The highest degradation efficiencies of Σ16 PAHs were obtained within 30 min in the order of: Fenton (83.5%) >ultrasound–Fenton (75.5%) >ultrasound (45.5%), then the efficiencies were decreased in the other of: ultrasound–Fenton (73.0%) >Fenton (70.3%) >ultrasound (41.4%) in 60 min. The extra PAHs were released from the intracellular substances and the cavities of sludge due to the disruption of sludge during the oxidation process. Also, the degradation of PAHs could be inhibited by the other organic matter in the sludge. The combined ultrasound–Fenton process showed more efficient than both ultrasound process and Fenton process not only in the surface of sludge but also in the sludge interior.