Fenton试剂处理腐殖酸废水影响特性和降解动力学模型

研究了Fenton试剂降解腐殖酸废水的影响特性,并在理论分析反应过程的基础上建立动力学方程,同时根据实验进行动力学方程参数估算。研究表明,Fenton试剂通过氧化和混凝共同作用有效去除腐殖酸。在初始pH=4,40mmol/L FeSO4和160 mmol/L H2O2投量下,腐殖酸60 min氧化去除率、混凝去除率分别达到78.6%和11.5%,其初始氧化速率达到最大59.6 mg/(L.min)。腐殖酸的氧化降解动力学模型值与实验值吻合良好,说明采用该动力学模型能较好预测腐殖酸废水的氧化降解情况,且Fenton氧化降解腐殖酸的机理符合自由基的理论和实践。

Influencing characteristics and kinetic model of humic acid degradation by Fenton＇s reagents

The influencing characteristics of Fenton’s reagent on the degradation of humic acid(HA) wastewater were studied.The dynamics model was established based on the theoretical analysis of reaction process.The parameters of dynamics model were estimated according to the experimental data.The results showed that HA was removed both by oxidation and coagulation.Under operating conditions of initial pH 4,Fe2+ dosage of 40 mmol/L and H2O2 dosage of 160 mmol/L,reaction time of 60 min,78.6% and 11.5% removals for oxidation and coagulation were achieved,respectively,meanwhile the highest initial oxidation rate of 59.6 mg/(L·min) was achieved.The prediction of models was found to agree well with experimental results and confirm the proposed reaction mechanisms,which indicated that the oxidation degradation mechanism of HA accorded with the theory and practice of hydroxyl radicals.