南水北调东线供水有机物含量对出厂水水质的影响

针对南水北调东线水引入胶东供水后水源水中有机碳的变化进行了分析,发现2016年以来水源水中有机碳含量显著升高,平均值在5 mg/L以上,有机碳含量的升高造成水中存在异嗅味、消毒副产物浓度升高、水质生物稳定性变差等问题。为了解目前水厂工艺对生物可同化有机碳(AOC)的去除作用和管网水质的生物稳定性状况,以某水厂为研究对象,分析了2019年2月水厂处理工艺各单元出水中TOC含量、有机碳的分子质量分布和AOC含量。结果表明,水厂处理工艺对TOC的去除率为23. 9%,出厂水中TOC含量较高。水厂原水主要以分子质量<0. 5 ku和3～5 ku的有机碳为主,各工艺段出水中不同分子质量有机碳对总溶解性有机碳的相对贡献变化不大。水厂原水AOC含量为322. 36μg/L,AOC-P17占总AOC的66. 1%,水处理工艺对AOC的总去除率为46. 1%,AOC-P17的去除率高于AOC-NOX的去除率。

Influence of Organic Matters Content in Eastern Line of South-to-North Water Diversion on Finished Water Quality

The change of organic carbon in the source water since the introduction of the eastern line of the South-to-North Water Diversion in Jiaodong water supply was analyzed.The results showed that the content of organic carbon in the source water had increased significantly with an average of 5 mg/L or more since 2016.The increase of organic carbon in water led to the problems of an unusual odour in finished water,increase of disinfection byproducts concentration and poor biological stability of water quality.In order to understand the removal of assimilable organic carbon(AOC)and the biological stability of water quality of the pipe network,the TOC content,distribution of organic carbon molecular weight and AOC content of different units in a waterworks were analyzed in February 2019.The removal efficiency of TOC by the treatment process of the waterworks was 23.9%,indicating that the TOC content in the finished water was high.The source water of the waterworks was mainly organic carbon with molecular weight less than 0.5 ku and between 3 ku and 5 ku,and the relative contribution of organic carbon with different molecular weight to the total dissolved organic carbon in the effluent of each unit was not significant.The AOC content in source water was 322.36μg/L,and AOC-P17 accounted for 66.1%of the total AOC.The total removal efficiency of AOC was 46.1%,and the removal efficiency of AOC-P17 was higher than that of AOC-NOX.