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以南水北调水为原水、聚合氯化铝(PAC)为混凝剂,进行微絮凝-直接过滤的中试试验。运用浊度仪、紫外分光光度计等对过滤前后水的浊度、UV_(254)、COD_(Mn)、NH_3-N和残余铝浓度进行检测,以确定PAC的最佳投加量,同时观察不同PAC投加量下滤柱内水头上涨幅度随时间的变化情况。结果表明:南水北调水河南受水区微絮凝-直接过滤工艺的PAC最佳投加量为24 mg/L,此时对浊度、COD_(Mn)、UV_(254)和NH_3-N的去除率分别为45.0%、59.3%、28.1%、80.0%,残余铝浓度未超标;该PAC投加量下,滤柱的反冲周期缩短为9 h,且滤柱内水头增长幅度与过滤时间呈线性关系。
Taking pilot water of South-North Water Transfer Project as raw water and polyaluminum chloride (PAC) as coagulant, pilot-scale experiments of micro-flocculation-direct filtration were carried out. The turbidity, UV_ (254), COD_ (Mn), NH_3-N and residual aluminum concentration of the water before and after filtration were detected by turbidimeter and UV spectrophotometer to determine the best dosage of PAC, and observed Different PAC dosage under the filter column head rise rate changes over time. The results showed that the best dosage of PAC was 24 mg / L for micro-flocculation-direct filtration process in the receiving area of water from South to North Water Diversion Project. At this time, the removal rates of turbidity, COD Mn, UV 254 and NH 3 -N Respectively, the residual aluminum concentration was not exceeded; under the PAC dosage, the recoil cycle of the filter column was shortened to 9 h, and the growth rate of the head of the filter column was linear with the filtration time relationship.