某市饮用水水质生物稳定性研究

Investigation of Bio Stability of Certain City's Drinking Water *

研究某市的几个典型水厂的ＡＯＣ和ＢＤＯＣ含量和其在处理工艺和管网中的变化规律，以及对爆管管道取样作扫描电镜分析，得到初步结论：①水源水质较好的水厂其出厂水和管网水中ＡＯＣ含量相对较低，反之则高．②在饮用水中ＡＯＣ与ＢＤＯＣ之比变化较大，但大量数据统计结果表明平均约为３０％～４０％，因此如果以ＢＤＯＣ作为饮用水生物稳定性的评价指标也是可以的．③常规给水处理工艺对ＡＯＣ的去除效果波动较大，大多数情况下低于３０％，而活性炭对ＡＯＣ去除效果较稳定，约３０％～６０％，多为５０％以上．④ＡＯＣ在管网中的变化受氯氧化和细菌活动的双重影响，氯氧化使ＡＯＣ增加，细菌活动使ＡＯＣ减少．⑤爆管管道扫描电镜分析表明，管道内壁并不平整，孔隙较多，有细菌生长．

The paper investigated the assimilable organic carbon (AOC) and biodegradable dissolved organic carbon (BDOC) concentrations and their changes in water treatment process and distributions of several typical water plants in the certain city in China and took distribution pipe encrustation samples for Scan Electron Microscope.Based on the study,the follows can be concluded:①Better source water quality results in lower AOC concentrations,otherwise it does higher ones. ②The ratio of AOC to BDOC varies significantly.The mean value is around 30%～40% based on the statistics,which demonstrate that BDOC can also be a assessment parameter for bacterial regrowth potential.③AOC can be removed in less than 30% by conventional treatment process,whereas in 30%～60%,mostly 50%～60% by granular activated carbon (GAC).④The change of AOC concentrations in distribution systems is affected by chlorine oxidation and bacterial activities:the former results in AOC increasing and the latter does AOC decreasing.⑤The Scan Electron Microscope of distribution pipe encrustion samples demonstrated that the pipe inner wall is not smooth,in which crevice exist and bacteria yield.