| 响应面法优化Fenton预处理精细化工废水 |
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| 引用本文： | 谢慧娜,嵇斌,李杰,王亚娥,赵炜.响应面法优化Fenton预处理精细化工废水[J].环境科学研究,2019,32(8):1419-1426. |
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| 作者姓名： | 谢慧娜 嵇斌 李杰 王亚娥 赵炜 |
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| 作者单位： | 兰州交通大学环境与市政工程学院,甘肃兰州 730070;西安理工大学水利水电学院,陕西西安710048 |
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| 基金项目： | 国家自然科学基金项目（No.51468030） |
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| 摘 要： | 甘肃省某精细化工企业实际生产废水成分复杂、有机物含量高、可生化性差，为满足后续生化工艺需求，急需开展适宜的预处理技术研究.采用Fenton氧化工艺对该企业废水进行预处理，在单因素试验基础上，以初始pH、H2O2投加量、n（H2O2）:n（Fe2+）、反应时间为考察因素，CODCr去除效果为响应值，构建响应曲面模型，分析4个独立因素及各因素之间的交互作用对CODCr去除效果的影响；同时，对反应过程进行表观反应动力学分析，采用紫外光谱及傅立叶变换红外光谱分析废水有机物结构变化，探究该反应过程机理.结果表明:①废水预处理的最佳工艺条件为初始pH 4、H2O2投加量8 mL/L、n（H2O2）:n（Fe2+）12、反应时间88 min，废水CODCr去除率达30.15%；模型的实际运行结果与预测值接近，模型可靠.②Fenton氧化降解该精细化工废水中有机物途径复杂，难以通过单一的底物模型进行拟合.③Fenton氧化能有效降解废水中不饱和有机物，但出水中仍含有酰胺类、不饱和醛类和芳香类化合物.研究显示，Fenton预处理能有效降解废水中难降解有机物，但出水仍未达到后续生化处理要求，还需进一步优化或与其他预处理工艺组合.
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| 关 键 词： | Fenton氧化法 精细化工废水 响应面 反应动力学 光谱分析 |
| 收稿时间： | 2018/8/27 0:00:00 |
| 修稿时间： | 2018/12/4 0:00:00 |
Optimization of Fenton Process for Pretreatment of Refractory Fine Chemistry Wastewater with Response Surface Methodology |
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| XIE Huin,JI Bin,LI Jie,WANG Yae and ZHAO Wei.Optimization of Fenton Process for Pretreatment of Refractory Fine Chemistry Wastewater with Response Surface Methodology[J].Research of Environmental Sciences,2019,32(8):1419-1426. |
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| Authors: | XIE Huin JI Bin LI Jie WANG Yae and ZHAO Wei |
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| Affiliation: | 1.College of Environmental and Municipal Engineering, Lanzhou Jiao Tong University, Lanzhou 730070, China2.Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China |
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| Abstract: | The wastewater from a fine chemistry enterprise in Gansu Province is characterized by complex ingredients, high organic matter content, and poor biodegradability. In order to meet the requirements of subsequent biochemical processes, it is essential to carry out appropriate pretreatment technology research. The present study demonstrated a trial of optimizing Fenton oxidation process for pretreatment of the fine chemistry wastewater via the response surface methodology (RSM). Based on the results of the single factor experiment, the initial pH, H2O2 dosage, n(H2O2):n(Fe2+) and reaction time were selected as the investigation factors and the CODCr removal efficiency as the response value. The individual effect of the four independent factors and the synergistic effects of their interactions on CODCr removal were studied and analyzed. Moreover, the apparent reaction kinetics, structural changes of wastewater organic matter, and the degradation mechanisms were studied by ultraviolet spectroscopy and Fourier transform infrared spectroscopy. The results showed that: (1) The optimum process conditions were initial pH of 4, H2O2 dosage of 8 mL/L, n(H2O2):n(Fe2+) of 12, reaction time of 88 min, and CODCr removal efficiency of 30.15%, which fitted well with the experimental results. (2) The degradation pathways of the organic matter in the fine chemistry wastewater by Fenton oxidation were complicated, and it''s difficult to fit through a single substrate model. (3) Fenton oxidation could effectively degrade unsaturated organic matter in the wastewater. However, the effluent still contained amides, unsaturated aldehydes, and aromatic compounds. In conclusion, Fenton oxidation pretreatment can effectively degrade the refractory organics in wastewater. However, the effluent still does not meet requirements of the subsequent biochemical treatment. Thus, further optimization or combination with other pretreatment processes is required. |
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| Keywords: | Fenton oxidation process fine chemical wastewater response surface model reaction kinetics spectral analysis |
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