Fe^(2+)/过氧化物体系氧化活性及其处理生活污水效果比较  

Comparisons of oxidation activity in the Fe^(2+)/peroxide system applied to domestic sewage treatment processes

作　　者：吴桐 黄雪 刘伟[2] 刘大会 蔡建波[1,4] 朱端卫 WU Tong;HUANG Xue;LIU Wei;LIU Da-hui;CAI Jian-bo;ZHU Duan-wei(Laboratory of Eco-environmental Engineering Research,College of Resources and Environment of Huazhong Agricultural University,Wuhan 430070,China;Shandong Key Laboratory of TCM Quality Control Technology,Shandong Analysis and Test Center,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250014,China;Pharmacy Faculty,Hubei University of Chinese Medicine,Wuhan 430065,China;Cooperative Innovation Center for Sustainable Pig Production,Wuhan 430070,China)

机构地区：[1]华中农业大学资源与环境学院生态与环境工程研究室,武汉430070 [2]齐鲁工业大学(山东省科学院)山东省分析测试中心山东省中药质量控制技术重点实验室,济南250014 [3]湖北中医药大学药学院,武汉430065 [4]湖北省生猪健康养殖协同创新中心,武汉430070

出　　处：《农业环境科学学报》2019年第1期193-200,共8页Journal of Agro-Environment Science

基　　金：国家滇池水体污染控制与治理科技重大专项课题(2012ZX07102-003-03);山东省自然科学基金项目(ZR2016YL006)~~

摘　　要：为了加快对分散性生活污水的有效治理,利用过氧化钙、过氧化镁及过氧化锌与Fe2+形成不同类芬顿体系,通过亚甲基蓝溶液在被氧化过程中的色度变化,考察了体系的氧化能力,在此基础上比较了体系对于生活污水中COD的去除效果。结果表明,在Fe2+/过氧化物为1∶2的最佳摩尔比下,pH越低,Fe2+/过氧化物的氧化能力越强;同时,过氧化物氧化亚甲基蓝过程可用一级反应动力学模型来拟合,比较过氧化钙、过氧化镁和过氧化锌,Fe2+/CaO2体系的氧化反应速率最大,其速率常数k可达2.55 min-1。用修正的Gompertz模型拟合表明,3种过氧化物在生活污水中释氧速率也是Fe2+/CaO2体系最快。摩尔比为1∶2的Fe2+/过氧化物体系在污水初始pH为3时,CaO2对污水COD的去除效果最好,COD的去除率达到74.9%;随着溶液pH的提高,MgO2、ZnO2对COD的作用受pH影响比CaO2更明显;Fe2+/过氧化物体系在自然酸度条件下对COD的去除表现为Fe2+的絮凝作用为主,当初始酸度调节至pH=5时,这一体系对COD的氧化作用明显加强。通过对Fe2+/过氧化物类芬顿体系作用与性能之比较,明确了Fe2+/CaO2更适合用于生活污水中COD的去除。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 Fe^2+to peroxides,1∶2,the highest oxidation ability was reached and simulated with the first order kinetic equation.Comparing Fe^2+/MgO2,Fe^2+/ZnO2,and Fe^2+/CaO2,the reaction rate of the Fe^2+/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 Fe^2+/CaO2 among the three kinds of peroxides was also the highest.As a consequence,COD removal in domestic sewage by using Fe^2+/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 Fe^2+,and the oxidation ability of the system would be much stronger when the initial pH was adjusted to 5.0.

关 键 词：FE^2+ 过氧化物 COD 氧化能力 絮凝作用 

分 类 号：X703[环境科学与工程—环境工程]