Fenton试剂降解中年期垃圾渗滤液的条件及动力学研究

Condition and Dynamics Study on Degradation of Metaphase Landfill Leachate for Solid Waste by Fenton Reagent

通过试验研究Fenton体系中羟基自由基的生成规律,考察了H_2O_2浓度、FeSO_4浓度、pH值等因素对羟基自由基生成的影响;采用"生成率"试验确定最佳试验操作条件,分析了Fenton试剂降解中年期垃圾渗滤液COD的动力学过程,将其分为两个近一级反应,其中第一阶段速率是第二阶段速率的近10倍。结果表明:当H_2O_2:Fe^(2+)=4:1、pH=4时,羟基自由基的生成量最佳,并且COD的降解多数发生在第一阶段。

The formation rules of the hydroxyl radical in Fenton system were studied. Three kinds of major factors who affect hydroxyl radical formation, such as concentrations of H2O2, FeSO4 and pH were also studied. The optimal experiment operating conditions were determined by ＂the production rate＂. The kinetics of metaphase landfill leachate COD degenerated by Fenton reagent was analyzed, which could be divided into two phases of apparent first order reaction, and the reaction rate in the fiirst phase was 10 times in comparison with that in the second phase. The results showed that the formation of hydroxyl radical could be optimized when H2O2 ： Fe^2＋= 4 ： 1 and pH=4, and COD degeneration occurred mostly in the first phase.