聚合硫酸铁混凝消除水中有机氯的研究

采用聚合硫酸铁(PFS)絮凝剂对水中有机氯农药(OCPs)进行强化混凝处理,并运用响应曲面法(RSM)优化分析了影响OCPs去除率的混凝条件,如pH值、原水浊度、混凝剂投加量和OCPs的初始浓度诸因素.结果表明,各影响因素交互作用显著,最佳混凝条件组合为:pH=5.0、原水浊度=150NTU、PFS投加量为12mg/L、OCPs初始浓度为200ng/L,在此条件下,PFS絮凝剂可有效去除水中OCPs,经模型验证实验得到最佳条件下去除率α-HCH为82.23%、β-HCH为71.15%、γ-HCH为77.28%、δ-HCH为86.27%、 p,p’-DDE为93.78%,与RSM预测值基本相同.结合絮体分形维数和Zeta电位对混凝效果的机理进行了探讨,表明各因素均达到了最佳水平.

The removal of OCPs in water by coagulation with poly ferric sulfate

Response surface methodology (RSM) was employed to optimize the various factors affecting the removal of organic chlorine pesticides (OCPs) pollutants in enhanced coagulation process with poly ferric sulfate (PFS) as the coagulant, such as pH value, turbidity, coagulant dosage and the initial concentration of OCPs. The optimization results show that the interactions of the factors were significant, the optimal conditions were: pH 5.0, the turbidity of raw water 150NTU, dosage 12mg/L and initial concentration of OCPs 200ng/L. Under these conditions, the OCPs in water could be removed effectively. The model validation experiment shows that the removal rate of α-HCH reached 82.23%, β-HCH 71.15%,γ-HCH 77.28%, δ-HCH 86.27%, p,p’-DDE 93.78%, respectively. Combined with fractal dimension and zeta potential measures, the analysis shows all factors reached the optimum.