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| Comparisons of oxidation activity in the Fe2+/peroxide system applied to domestic sewage treatment processes |
| Received:April 08, 2018 |
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| KeyWord:Fe2+;peroxides;COD;oxidation ability;flocculation |
| Author Name | Affiliation | E-mail | | WU Tong | Laboratory of Eco-environmental Engineering Research, College of Resources and Environment of Huazhong Agricultural University, Wuhan 430070, China | | | HUANG Xue | Laboratory of Eco-environmental Engineering Research, College of Resources and Environment of Huazhong Agricultural University, Wuhan 430070, China | | | LIU Wei | Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Qilu University of Technology(Shandong Academy of Sciences), Jinan 250014, China | | | LIU Da-hui | Pharmacy Faculty, Hubei University of Chinese Medicine, Wuhan 430065, China | | | CAI Jian-bo | Laboratory of Eco-environmental Engineering Research, College of Resources and Environment of Huazhong Agricultural University, Wuhan 430070, China
Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China | | | ZHU Duan-wei | Laboratory of Eco-environmental Engineering Research, College of Resources and Environment of Huazhong Agricultural University, Wuhan 430070, China
Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China | zhudw@mail.hzau.edu.cn |
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| Abstract: |
| Peroxides, such as calcium peroxide, magnesium peroxide, and zinc peroxide, have been used as chemical reagents of the Fenton-like system. In this study, the oxidation ability of these compounds with Fe2+ was investigated by monitoring the color change of methylene blue in solutions, with a focus on the removal efficiency of the chemical oxygen demand(COD) in domestic sewage. Under the optimum molar ratio of Fe2+ to peroxides, 1:2, the highest oxidation ability was reached and simulated with the first order kinetic equation. Comparing Fe2+/MgO2, Fe2+/ZnO2, and Fe2+/CaO2, the reaction rate of the Fe2+/CaO2-methylene blue system was the highest, with a constant rate of 2.55 min-1. Moreover, the fitting of the modified Gompertz model showed that the rate of oxygen release of Fe2+/CaO2 among the three kinds of peroxides was also the highest. As a consequence, COD removal in domestic sewage by using Fe2+/peroxides with a molar ratio of 1:2 showed a maximum removal efficiency for COD, especially for wastewater at pH 3, where the removal rate of COD approached 74.9%. With increasing pH(>3.0), the removal of COD by MgO2 or ZnO2 was mainly affected by the pH of the domestic sewage. For the natural acidity, the removal of COD by Fe2+/peroxide systems was mainly caused by the flocculation of Fe2+, and the oxidation ability of the system would be much stronger when the initial pH was adjusted to 5.0. |
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