超滤-纳滤双膜工艺深度净化饮用水效能试验研究

Experimental study on advanced purification of drinking water by UF-NF membrane process

采用超滤-纳滤(UF-NF)双膜工艺对给水厂滤后水进行深度净化,研究UF-NF双膜工艺对水中各种污染物的去除效果。研究结果表明:UF-NF双膜工艺对各项指标均有很好的去除效果,超滤预处理能充分保证纳滤膜的稳定运行;UF-NF双膜工艺对常见微量有机污染物苯和苯乙烯的去除率分别为98.73%~99.07%和99.58%~99.75%,出水平均值分别为3.060μg/L和1.792μg/L;对常见重金属锌和镉的去除率分别为99.22%~99.34%和99.16%~99.34%,出水平均值分别为0.025 mg/L和0.201μg/L。UF-NF双膜工艺出水中常量污染物、微量有机物、重金属等指标均远低于GB 5749—2006"生活饮用水卫生标准"的限值,饮用水品质得到显著改善,能全面提高和保证居民生活饮用水的安全性。

The UF-NF membrane process was used to study the removal efficiency of various pollutants in advanced purification of filtrated water in waterworks.The results show that the UF-NF membrane has good removal efficiency of various indexes and fluorescent substance.Ultrafiltration process can fully guarantee the stable operation of nanofiltration membrane process.The removal rates of benzene and styrene are from 98.73%to 99.07%and 99.58%to 99.75%,and the average values of effluent are 3.060μg/L and 1.792μg/L.The removal rates of heavy metal zinc and cadmium are from 99.22%to 99.34%and 99.16%to 99.34%,and the average values of effluent are 0.025 mg/L and 0.201μg/L.The contents of constants of pollutants,trace organic,heavy metal compounds are accorded with GB 5749-2006“standards for drinking water quality”.The drinking water quality has been improved significantly,and the safety of residents drinking water has been enhanced and guaranteed.