常州段长江原水强化混凝处理工艺的中试试验

Pilot Test of Enhanced Coagulation Process for Treatment of Raw Water from Changzhou Section of Yangtze River

为了提高长江常州段原水的混凝处理效果,采用不同混凝剂和助凝剂对长江水进行强化混凝现场中试试验。结果表明,聚合氯化铝(PAC)、聚合硫酸铁(PFS)和明矾这3种混凝剂中,PAC对长江水的混凝效果最好,形成絮体大,沉降性能好。PAC最佳投加量为30 mg/L,浑浊度去除率为84.6%,UV254去除率达43.1%,COD和DOC去除率也较高,三维荧光强度显著降低。当聚丙烯酰胺投加量为0.09 mg/L时,可以兼顾助凝效果和经济性,浑浊度去除率达87.2%,UV254去除率达46.9%,三维荧光强度进一步降低。研究优化了长江水的强化混凝运行工况,对于指导实际水厂运行具有较好的参考意义。

Different coagulants and coagulant aids were used to conduct in-situ pilot test on the enhanced coagulation of the Yangtze River water,in order to improve coagulation treatment effect of raw water from Changzhou section of the Yangtze River.Results showed that among the three coagulants of polyaluminium chloride(PAC),polyferric sulfate(PFS)and potassium alum,PAC exhibited the best coagulation effect,large flocs and good sedimentation performance.When the optimum dosage of PAC was 30 mg/L,the removal rate of turbidity was 84.6%and UV254 was 43.1%.Removal rates of COD and DOC were also high,apart from that,the three-dimensional fluorescence intensity was significantly reduced.Polyacrylamide(PAM)of 0.09 mg/L could enhance the coagulation and economy effect.The removal rate of turbidity was 87.2%and UV254 was 46.9%.Three-dimensional fluorescence intensity was also further reduced.The study optimized the intensive coagulation operation conditions of the Yangtze River water and gave significance reference for guiding the actual operation of water treatment plants.