Photo-Fenton mineralization of synthetic municipal wastewater effluent containing acetaminophen in a pilot plant
Photo-Fenton mineralization of synthetic municipal wastewater effluent containing acetaminophen in a pilot plant
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DOI：
10.1016/j.desal.2010.11.032
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发表时间：
2011-04-01
期刊：
影响因子：
9.9
通讯作者：
Ruiz-Murillo, M.
中科院分区：
文献类型：
--
作者：
Duran, A.;Monteagudo, J. M.;Ruiz-Murillo, M.
本工作的目的是研究对乙酰氨基酚（ACTP）的矿化存在于合成的城市污水（SE）。在UV-A/C中试装置上，采用连续投加H2 O2的均相光Fenton氧化工艺，研究了矿化过程，发现矿化过程符合准一级动力学。实验动力学常数拟合使用神经网络（NN）。数学模型再现了实验数据，置信度在90%以内。在最佳条件下（H2 O2流速= 50 mL/h，[Fe（II）]= 2 ppm，pH = 2.5，温度= 40 ℃），COT的收率分别为71.5%、82.1%和94%，COD和BDO-5分别在120 min内去除，H2 O2消耗量和残留量的测定表明，5.8 mol H2O（2）每摩尔从溶液中除去的总有机碳消耗。同时证实了为获得高矿化率，需要过量的溶解H2 O2，因此在工业应用中推荐连续加入过氧化物.负载清除剂条件的对比实验证明，反应主要通过自由基和单氧机理进行（96.7%）.其次是分子途径（0.7%）和直接光解（2.6%）。(C)2010 Elsevier B. V.保留所有权利。
The aim of this work was to study the mineralization of acetaminophen (ACTP) present in synthetic municipal wastewater effluent (SE.) in a UV-A/C pilot plant using a homogeneous photo-Fenton oxidation process with continuous addition of H(2)O(2) to the system.The mineralization process was found to follow pseudo-first-order kinetics. Experimental kinetic constants were fitted using neural networks (NNs). The mathematical model reproduced the experimental data to within a 90% confidence level. At the optimum conditions (H(2)O(2) flow rate = 50 mL/h, [Fe(II)]= 2 ppm, pH = 2.5 and temperature = 40 degrees C), 71.5%, 82.1% and 94% of COT, COD and BDO-5 were removed in 120 min respectively.Determination of the hydrogen peroxide consumed and remaining in the water revealed that 5.8 mol of H(2)O(2) were consumed per each mol of total organic carbon removed from solution. It was also confirmed that an excess of dissolved H(2)O(2) is needed to achieve high mineralization rates, so continuous addition of peroxide is recommended for industrial application of this process.Comparison experiments of scavenger-loaded conditions proved that the reaction takes place mainly through a radical and single oxygen mechanism (96.7%). The molecular pathway (0.7%) and direct photolysis (2.6%) are secondary. (C) 2010 Elsevier B.V. All rights reserved.