含甲醛废水的过氧化氢湿式氧化及其反应动力学  

Kinetics and Reaction Pathways for Formaldehyde-containing Wastewater Wet Oxidation with Hydrogen Peroxide

作　　者：杨波[1] 胡成生[1] 韦朝海[1] 

机构地区：[1]华南理工大学化工学院,广东广州510640

出　　处：《高校化学工程学报》2003年第6期667-672,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金 (29877009;20277010);广东省与广州市环保局科技项目

摘　　要：在连续流釜式反应器中,以过氧化氢为氧化剂,辅以温度和压力,研究了湿式氧化法处理甲醛模拟废水的工艺条件:过氧化氢供氧量为废水理论需氧量的110%时为宜;160～180℃为甲醛湿式氧化的适宜温度范围;甲醛初始浓度在480～1500mg@L-1范围内能保持较高的去除率.建立了该反应的指数型经验动力学模型方程,得出基于甲醛和COD的表观活化能分别是38.67kJ@mol-1和53.02kJ@mol-1.反应产物的紫外光谱分析表明中间产物甲酸的进一步氧化是甲醛彻底降解的限速步骤.The wet oxidation of simulant formaldehyde-containing wastewater was studied by using hydrogen peroxide as oxidant instead of air at high temperature and high pressure in a continuous reactor. The experimental results show that the quantity of oxidant with 110% to theoretical oxygen demand of wastewater is comparatively effective and economical. The reaction temperature between 160°C and 180°C and the initial formaldehyde concentration changed within the range of 480 mg&middotL-1 and 1500 mg&middotL-1 are feasible for obtaining higher removal rate of formaldehyde by the wet oxidation reaction. An empirical model was set up and the activation energies based on formaldehyde and COD are 38.67 kJ&middotmol-1 and 53.02 kJ&middotmol-1, respectively. The analysis of reaction products by UV spectrum supposes that the oxidation of the intermediate product, namely, formic acid, is the bottleneck of wet oxidation reaction.

关 键 词：甲醛 过氧化氢 湿式氧化 动力学 

分 类 号：X703.1[环境科学与工程—环境工程] O621.254.1[理学—有机化学]