中文摘要：

以石家庄某水库低温低浊水为研究对象，采用有机物表观相对分子质量分级和有机物化学极性分级技术从分子水平的变化对原水溶解性有机物进行分析，并测定了其各组分质量分数与三卤甲烷生成势的相关性，获得了原水中溶解性有机物DOM去除率较低的原因，同时进行了二次微絮凝和常规絮凝的混凝试验，考察了水体浊度、Zeta电位、抽滤时间、颗粒数和有机物等各指标的变化情况。结果表明，二次微絮凝比常规絮凝有更强的混凝去除效果，当聚合氯化铝PAC总投加量为13 mg/L、絮凝时间为3 min时，滤后水浊度可达到0.1 NTU以下。二次微絮凝不但改变了胶体的Zeta电位，增加了絮凝效果，而且提高了对有机物和颗粒数的去除率，抽滤时间也相应缩短。

英文摘要：

The present paper attempts to introduce its study on the low temperature and low turbidity water originally taken from a reservoir of Shijiazhuang as a research subject for our research topic on the secondary micro-flocculation and conventional flocculation. For the said purpose of our research, we have analyzed the dissolved natural organic matter in the untreated sewage for the molecular change and the correlation between the content and the disinfected by-product-formation potential （DBPFP） of its components. While applying the technology of the organic apparent molecular weight classification and the organic chemical polarity classification, we have done some research on the effect of processing a kind of typical southern water suitable for the technology of the secondary micro-flocculation. As we know, great changes have taken place with the quality of water from Hebei. Whether the technology can be used for treating the water of low temperature and low turbidity in the north of China remains to be carefully tested. We have also tested the secondary micro-flocculation and conventional flocculation and determined some factors that have been detected, such as the turbidity, Zeta, filtration time, the number of granules and organic pollutants. The results of our experiments show that the secondary micro-flocculation has a higher removal efficiency than the conventional flocculation in the coagulation process. When the total dosage of the polyaluminium chloride PAC is 13 mg/L and the flocculation time is 3 min, the flocculation of the ideal Zeta potential should be kept within ±5 mV, and the water turbidity can be kept lower than 0.1 NTU after filtration. What is more, the secondary micro-flocculation can not only change Zeta and enhance flocculation effect, but also can improve the removal rate of organic pollutant and the number of granules, and helps to shorten the filtration time, too. Particularly speaking, the secondary micro-flocculation can also help to enhance the removal ability of TOC and UV 254