HCA强化混凝预处理生活污水的效能及机理

通过单因素及正交试验，以聚二甲基二烯丙基氯化铵（HCA）为混凝剂对模拟农村生活污水进行强化混凝预处理，考察了影响HCA混凝去除SS、TP及有机物的主要因素及其主次顺序，并以Zeta电位及分形维数对HCA的混凝机理进行了分析.结果表明，影响HCA处理效果的因素顺序为初始pH值值 > HCA投加量 > 絮凝搅拌时间 > 混合搅拌速度梯度 > 混合搅拌时间 > 絮凝搅拌速度梯度，在优化条件下HCA混凝对SS、TP及COD去除率最高分别达94.1%、74.9%及61.1%；当HCA投加量为15mg/L时，Zeta电位与絮体分形维数分别为-2.03mv及1.0149.试验表明HCA对生活污水具有较好的处理效果，强化混凝去除污染物的机理主要是电性中和作用.

Efficiencies and mechanism analysis of HCA strengthening coagulation on pretreatment of domestic sewage

The single factor and orthogonal experiments were carried out to enhance coagulation pretreatment of simulation of rural domestic sewage used by Poly Dimethyl Diallyl Propy Ammoniuml Chloride (HCA) as a coagulant,meanwhile the removal sequence of HCA and main factors were also analyzed on the removal effect of SS,TP and organic matter by HCA. Meanwhile the coagulation mechanism of HCA was analyzed through the Zeta potential and fractal dimension. The results showed that the influence factors of HCA treatment effect was in as a order of the initial pH value > HCA dosage > flocculation stirring time > mixed speed gradient > blend stirring time > flocculation stirring speed gradient, and under the optimized conditions, SS, TP and COD removal rates were up to 94.1%, 74.9% and 61.1%, respectively; when the dosage of HCA was 15mg/L, Zeta potential and the fractal dimension of flocs was -2.03mv and 1.0149, respectively. The analysis of the experimental results showed that the HCA of sewage treatment had obvious effect and its mechanism was mainly charge neutralization.