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采用Fenton法预处理难降解干法腈纶废水,选取H2O2用量、Fe2+用量、初始pH和反应温度4个因素为变量,COD去除率为响应值进行中心组合设计。利用响应面法对实验结果进行分析,建立了以COD去除率为响应值的二次多项式模型并进行了显著性检验,分析了各因素单独及交互作用对COD去除率的影响,确定了最佳反应条件,并考察了最佳条件下处理前后废水可生化性和毒性变化。结果表明,所选取的4个因素影响COD去除率的主次顺序依次为:H2O2用量、Fe2+用量、初始pH和反应温度;在H2O2浓度为90.0 mmol/L、Fe2+浓度为23.9 mmol/L、初始pH值为3.4、温度为38.5℃的最佳条件下,COD去除率为53.8%,与模型预测值51.9%吻合度较高,偏差仅为3.66%;最佳条件下处理后废水可生化性显著提高,生物毒性明显降低,适宜于后续的生化处理。
Fenton method was used to pretreat refractory dry acrylic wastewater. Four variables of H2O2 dosage, Fe2 + dosage, initial pH and reaction temperature were selected as variables. The COD removal rate was selected as the central composite design. The response surface method was used to analyze the experimental results. The quadratic polynomial model with COD removal rate as the response value was established and the significance test was carried out. The influence of each factor on COD removal efficiency was analyzed and the best Reaction conditions, and investigated under the best conditions before and after treatment of biodegradability and toxicity of wastewaters. The results showed that the order of the primary and secondary factors affecting the removal rate of COD were as follows: the amount of H2O2, the amount of Fe2 +, the initial pH and the reaction temperature. Under the conditions of H2O2 concentration of 90.0 mmol / L, Fe2 + concentration of 23.9 mmol / L, Under the optimal pH value of 3.4 and temperature of 38.5 ℃, the removal rate of COD was 53.8%, which was in good agreement with the model predictive value of 51.9% and the deviation was only 3.66%. Under the optimum conditions, the biodegradability of the treated wastewater was significant Improve the biological toxicity significantly reduced, suitable for subsequent biochemical treatment.