预氧化强化混凝工艺处理南水北调-水库掺混源水

针对邯郸市双水源供水体系,开展了预氧化强化混凝工艺处理南水北调-本地水库掺混源水试验。结果表明,单因素试验得到的PAC、次氯酸钠最佳投加量分别为5～15、0. 1～1. 0mg/L,慢速反应搅拌速度以60～100 r/min为宜;采用Box-Behnken法对单因素试验参数进行优化,并建立了响应值为叶绿素a和浊度去除率与PAC、次氯酸钠投加量及慢速反应搅拌速度的二次回归模型,通过Design-Expert软件得到的最优工艺参数如下:PAC投加量为11. 85 mg/L、次氯酸钠投加量为0. 88 mg/L、慢速反应搅拌速度为67 r/min,此时对叶绿素a和浊度去除率的预测值分别为93. 27%、90. 79%,与实测值93. 26%、90. 85%高度接近。

Treatment of Source Water from South-to-North Water Diversion Project Mixed with Reservoir Water by Pre-oxidation Enhanced Coagulation Process

Based on dual water sources of Handan water supply system,source water from South-to-North Water Diversion Project mixed with local reservoir water was treated by pre-oxidation enhanced coagulation process.The optimum dosage of PAC and sodium hypochlorite were 5-15 mg/L and 0.1-1.0 mg/L respectively,and the opitimum stirring speed of slow reaction was 60-100 r/min.The Box-Behnken method was used to optimize the single factor test parameters of the process,and a secondary regression model with the response value(chlorophyll a and turbidity removal rates)and PAC dosage,sodium hypochlorite dosage and slow reaction stirring speed were established.The optimal process parameters obtained by Design-Expert software were as follows:PAC dosage of 11.85 mg/L,sodium hypochlorite dosage of 0.88 mg/L and slow reaction stirring speed of 67 r/min.Under the optimal condition,the predicted removal rates of chlorophyll a and turbidity were 93.27%and 90.79%,respectively,which were close to the measured values of 93.26%and 90.85%.