【摘要】 研究了KMnO₄预氧化与混凝工艺组合去除黑臭水COD_Cr、UV₂₅₄和浊度效果,分析多种混凝剂混凝处理黑臭水的絮凝性能,并对比分析投加KMnO₄前后的去除效果。结果表明:聚硅酸铁镁混凝剂对黑臭水浊度的去除效果优于聚合氯化铝和氯化铁混凝剂;SEM表征结果发现,聚硅酸铁镁呈紧簇团聚树枝状,能增强混凝过程中的吸附架桥和网捕等功能。KMnO₄预氧化能强化聚硅酸铁镁混凝剂去除有机污染物,在水样p H为8.0,KMnO₄投加浓度为25 mgL,预氧化时间为25 min时,COD_Cr去除率最高,可达81.76%,比单一混凝工艺提高了12.15个百分点;UV₂₅₄去除率最高可达49.44%,较单一混凝工艺提高了11.71个百分点;投加KMnO₄前后,浊度去除率均在90%以上。更多还原

【Abstract】 The removal effect of organic pollutants in black and odorous water by KMn O₄pre-oxidation combined with conventional coagulating sedimentation treatment processes was studied.The flocculation performance of various coagulant flocculation treatment was analyzed,and the removal effects of COD_{C r},UV₂₅₄and turbidity before and after adding potassium permanganate compared and analyzed.The test results showed that KMnO₄pre-oxidation technology could strengthen the poly ferric magnesium silicate（PFMS）coagulating sedimentation process to remove organic pollutants.In the entire dosage range of the coagulation test,the PFMS coagulant had a great effect on the black and odorous water turbidity.The removal rate of turbidity was much higher than that of poly aluminum chloride and ferric chloride coagulants.The results of SEM characterization showed that the PFMS was aggregated in a tree-like shape,which could enhance the functions of adsorption bridging and net replenishment in the coagulation process.When the pH of raw water was 8,the dosage of KMnO₄was 25 mgL,and the pre-oxidation time was 25 minutes,the highest COD_Crremoval rate of 81.76%could be reached,which was 12.15 percent higher than the single coagulating sedimentation process,while the highest UV₂₅₄removal rate was 49.44%,increased by 11.71 percent compared with the single coagulating sedimentation.The turbidity removal rate of black and odorous water before and after adding KMnO₄was both above 90%.更多还原