高锰酸盐-聚丙烯酰胺联用强化混凝处理太湖支流原水研究

Study on PPC and PAM enhanced coagulation process treating slightly polluted raw water from tributary of Taihu Lake

太湖B支流地表水受水土流失、水体富营养化和环境污染等因素影响,水体污染严重,水中有机物浓度和藻密度相对较高。常规的"混凝—沉淀—砂滤—加氯消毒"处理工艺难以有效地去除水中有机物、铁锰、藻类等物质。采用高锰酸盐(PPC)-聚丙烯酰胺(PAM)联用强化混凝工艺对原水进行处理。高锰酸盐投量在0.45 mg/L和聚丙烯酰胺投量在0.07 mg/L条件下联用强化混凝的静态试验结果表明:PPC-PAM联用强化混凝对浊度、色度、铁、锰和耗氧量的平均去除率为90%、73%、92%、99%和38%。PPC在0.3～0.5 mg/L投量和PAM在0.05～0.10 mg/L投量下联用强化混凝生产试验的出厂水浊度、色度、铁、锰等指标,均比历史同期水平要好。

A tributary of Taihu Lake being applied as the drinking water source was polluted due to the soil and water loss, eutrophication and environmental pollution. The raw water has high contents of organic substances and algae. Existing conventional water purification process of coagulation-sedimentation-filtration-disinfection is incompetent to remove organic substances, Fe, Mn and algae. Therefore, experiments of permanganate （PAM）enhanced coagulation were conducted. The jar （PPC） in combination with polyacry lamide test results showed that at condition of PPC dosage 0.45 mg/L and PAM dosage 0.07 mg/L, average removal rates of 90%, 73%, 92%, 99% and 380% were obtained for turbidity, colority, Fe, Mn and CODMn respectively. Also the full-scale experiment showed that the removal of turbidity, colority, Fe and Mn improved evidently in case when the dosages were 0. 3 to 0.5 mg/L and 0.05 to 0. 10 mg/L {or PPC and PAM respectively.