响应曲面法优化Fe-Ce/AC处理兰炭废水工艺

采用浸渍法制备负载双金属(铁和铈)活性炭(Fe-Ce/AC),以Fe-Ce/AC为非均相Fenton催化剂处理兰炭废水。在单因素实验基础下,以pH值及H₂O₂和Fe-Ce/AC投加量为考察因素,兰炭废水COD去除率为评价指标,确定H₂O₂最佳投加量为3 mL,Fe-Ce/AC最佳投加量为0.10 g,pH最佳值为4。采用中心组合设计-响应曲面法优化Fe-Ce/AC非均相Fenton技术处理兰炭废水工艺,结果表明,各影响因子显著性顺序为:pH>Fe-Ce/AC投加量>H₂O₂投加量,其中,H₂O₂投加量与Fe-Ce/AC投加量间交互作用显著,模型校正决定系数$R^{2}_{adj}$=为0.920 9,模型回归项极显著(P<0.000 1),表明模型可信度和准确度高;最佳工艺条件为:pH=3.7,H₂O₂投加量为2.7 mL,Fe-Ce/AC投加量为0.1 g,COD去除率模型预测值为81.31%,与实验值80.05%相比,相对误差为1.55%,表明模型对实验结果有良好的预测性。

Process optimization of treating semi-coking wastewater by Fe-Ce/AC using response surface method

Fe-Ce/AC was prepared by impregnation method and used as heterogeneous Fenton catalyst in treating semi-coking wastewater.Basing on the single factor test,the optimal conditions were determined as 3 mL of H₂O₂,0.10 g of Fe-Ce/AC,4 of pH,when selecting pH value,H₂O₂amount,Fe-Ce/AC amount as investigation factors and COD removal efficiency as evaluation indicator.When central composite design(CCD) was used to optimize the heterogeneous Fenton process in treating semi-coking wastewater using Fe-Ce/AC as catalyst,the results showed that the significance of the three factors on COD removal rate followed as:pH>dose of Fe-Ce/AC>dose of H₂O₂.The most significant interaction occurred between dose of Fe-Ce/AC and dose of H₂O₂.The calibrate determination coefficient($R^{2}_{adj}$) was 0.920 9 and the regression of this model(P<0.000 1)was significant,which demonstrated the model was reliable and of high precision.The optimum conditions were determined to be:H₂O₂ dosage 2.90 mL,Fe-Ce/AC dosage 0.10 g and pH 3.67.The predicted maximum COD removal rate was 81.31%,while the verification test was 80.05%,with a deviation of 1.55%,indicating that the model had good predictability on the experimental results.