响应曲面法优化强化混凝工艺处理微污染水

为进一步提高微污染水中氨氮、有机物去除效果，采用响应曲面法对强化混凝工艺处理微污染水的影响因素和去除效果进行研究，实验以混凝剂投加量、助凝剂投加量和助凝剂投加点为影响因素，浊度、氨氮和COD去除效果为响应值，利用Design-Expert软件对实验数据进行处理，得到二次响应曲面模型，各因素间的交互作用对响应值的影响以及优化水平值。模型优化结果显示，强化混凝处理微污染水的最佳工艺条件为：PAFC投加量17.80 mg·L-1，PAM投加量0.39 mg·L-1，PAM于快速搅拌结束投加，此时浊度、氨氮、COD的去除率分别为68.03%、10.92%和30.2%，最终通过模型的验证证明了响应曲面法用于优化强化混凝工艺处理微污染水的可行性和有效性。

Treatment of response surface methodology to optimize enhanced coagulation process for micro-polluted water

To improve the removal efficiency of ammonia nitrogen and organic matter in micropolluted water, a response surface methodology (RSM) was applied to study the influencing factors and removal effect of an enhanced coagulation process to micropolluted water. In this study, different dosing quantities of PAFC and PAM and dosing point of PAM were used as the influential factors and the removal of turbidity, ammonia nitrogen, and COD as the responses. Design-Expert was used to analyze the data, and the quadratic response models, interactions, and optimum levels were obtained. The results showed that with a dosing quantity of PAFC of 17.80 mg·L-1, dosing quantity of PAM of 0.3 mg·L-1, and dosing point of PAM is the ending of fast string, that turbidity, ammonia nitrogen, and COD were removed the best, with removal rates of 68.03%, 30.2%, and 10.92% respectively. Finally, the experimental data and model predictions matched well, which means that the RSM is very efficient and feasible for optimizing the enhanced coagulation process of micropolluted source water.