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采用Fenton氧化法处理炼化污水回用水中的反渗透浓排水,在单因素实验的基础上,应用Box-Behnken中心组合设计建立数学模型,以COD去除率为考察指标,进行响应面分析。单因素实验表明,在质量分数30%的H2O2投加量为0.6 mL/L、FeSO4·7H2O投加量为1.8 g/L、初始pH为3、反应1.5 h及H2O2分3次投加时,COD去除率为58.61%。通过Box-Behnken实验设计和方差分析可知,FeSO4·7H2O投加量和pH之间的交互作用比较显著。反应优化组合条件是H2O2投加量为0.66 mL/L、初始pH为3.01、FeSO4·7H2O的加入量为2.45 g/L,在此条件下COD去除率为59.96%。采用响应面法对Fenton法处理反渗透浓排水进行优化合理可行。
The Fenton oxidation process was used to treat the reverse osmosis concentrated drainage in the recycle water of refinery wastewater. Based on the single factor experiment, a mathematical model was set up by using the Box-Behnken center combination design. The COD removal rate was taken as the index to analyze the response surface. The results of single factor experiments showed that when the mass fraction of H2O2 was 0.6 mL / L, the dosage of FeSO4 · 7H2O was 1.8 g / L, initial pH was 3, reaction time was 1.5 h and H2O2 was added 3 times, COD removal rate of 58.61%. The Box-Behnken experimental design and analysis of variance showed that the interaction between FeSO4 · 7H2O dosage and pH was significant. The optimized reaction conditions were as follows: the dosage of H2O2 was 0.66 mL / L, the initial pH was 3.01, the dosage of FeSO4 · 7H2O was 2.45 g / L, COD removal efficiency was 59.96% under these conditions. The response surface method was used to optimize the Fenton process for treating reverse osmosis concentrated drainage.