基于Box-Behnken响应曲面法优化Fenton预处理高浓度染料中间体生产废水

为高效处理染料中间体生产废水、优化工艺参数，针对染料中间体生产废水有机负荷高、生物抑制性强等特点，选用Fenton氧化处理过程，以实际生产废水为研究对象，基于Box-Behnken响应曲面法分别考察了反应时间、初始pH、n(H₂O₂)/n(Fe2+)、Fenton试剂投加频率等因素对Fenton法处理废水过程的单独影响及各因素间的交互作用，并建立以COD_Cr去除率为评价指标的数学模型进行全面分析.结果表明:各影响因子显著性顺序为初始pH>n(H₂O₂)/n(Fe2+)>Fenton反应时间>投加频率，其中n(H₂O₂)/n(Fe2+)与投加频率的交互作用最为显著(F=3.43)；模型决定系数R2=0.917 9，说明模型可信度和精密度高；最佳反应条件组合为反应时间30 min、初始pH为3.46、n(H₂O₂)/n(Fe2+)为6.12、投加频率为2次.预测最大COD_Cr去除率为56.53%，验证试验实测平均结果为55.17%，与预测值相比偏差为1.36%.经最优条件处理后废水的ρ(COD_Cr)由9 600 mg/L降至4 000 mg/L左右，ρ(BOD₅)/ρ(COD_Cr)由0.07增至0.37，可生化性提高.研究显示，采用Fenton法预处理高浓度染料中间体废水可有效提高COD_Cr去除率及其可生化性. 

Optimization of Fenton Pre-Treatment of High Concentration Dye Intermediate Wastewater Based on Box-Behnken Response Surface Methodology

In order to treat dye intermediate wastewater efficiently and optimize the process parameters, this study investigated actual production wastewater and characterized it by high organic loading and biological inhibition.Based on the Box-Behnken response surface method, the separate action and interaction effects of reaction time, initial pH, n(H₂O₂)/n(Fe2+) and dosing frequency were evaluated, and an empirical mathematical model between COD_Cr removal rate and influencing factors was established by Fenton process.The significance of influencing factors followed the order:initial pH> n(H₂O₂)/n(Fe2+)>reaction time>dosing frequency, and the most significant interaction occurred between n(H₂O₂)/n(Fe2+) and dosing frequency (F=3.43).Furthermore, the decision coefficient R2=0.9179 showed that the model had high reliability and high precision.The optimal reaction conditions were determined to be reaction time 30 min, pH 3.46, n(H₂O₂)/n(Fe2+)6.12, and dosing frequency twice.The predicted maximum COD_Cr removal was 56.53%, while the average result of verification test was 55.17%, with a deviation of 1.36%.Under optimal conditions, the ρ(COD_Cr) of the treated wastewater decreased from 9600 mg/L to about 4000 mg/L, ρ(BOD₅)/ρ(COD_Cr) increased from 0.07 to 0.37, indicating that the biochemical properties were improved.Therefore, the Fenton process was successfully applied for the pretreatment of the high concentration dye intermediate wastewater with a favorable COD_Cr removal efficiency and could improve the biodegradability.