磁絮凝法处理河水工艺条件的响应面分析

应用响应面法分析磁絮凝工艺处理微污染河水的影响因素和去除效果.以聚合氯化铝(PAC)、磁粉(MP)和聚丙烯酰胺(PAM)的投加量为因素,利用中心组合设计(Box-Behnken)和响应面法(RSM)分析了3个因素对响应值(浊度、正磷酸盐(PO₄^3--P)和化学需氧量(COD)的去除率)的影响,并通过拟合回归模型来描述河水中污染物的去除效果.试验结果表明:磁絮凝工艺处理微污染河水的最佳工艺条件为:PAC为51.31 mg/L、MP为176.47mg/L、PAM为0.10 mg/L.在该条件下,浊度、正磷酸盐和COD的去除率分别可以达到96.80%、86.25%和51.00%,与模型预测值的相对误差小于2.12%.建立的统计学模型确信可靠,同时表明磁絮凝工艺具有较高的河水污染物去除能力.

Analysis of Magnetic Flocculation Process Conditions for River Water Treatment by Response Surface Method

Response surface methodology(RSM) was applied to analyze the magnetic flocculation influencing factors and removal efficiency for micro-polluted river water treatment.Box-Behnken experimental design was applied.The poly aluminum chloride(PAC),magnetic particle(MP) and polyacrylamide(PAM) were chosen as causal factors.The effects of these factors on turbidity,orthophosphate(PO3-4-P) and chemical oxygen demand(COD) removal efficiency were analyzed using RSM.The pollutants removals in river water were developed to describe by regression models.The results showed that the optimum conditions were PAC 51.31 mg/L,magnetic particle 176.47 mg/L and PAM 0.10 mg/L.Based on these conditions,the turbidity,orthophosphate and COD removals were 96.80%,86.25% and 51.00%,respectively.The relative errors between the measured data and the predicted values were less than 2.12%.It confirms that the statistic models are reliable,and the magnetic flocculation operating conditions for contaminants removals in river water are appropriated.