摘要：

采用三氯化铁作为混凝剂，通过变化投加量和pH，考察各个分子质量区间的DOC和UV₂₅₄的变化情况，了解强化混凝去除有机物的效果和机理。增加混凝剂的投加量能有效地促进各分子质量区间的UV₂₅₄的去除，但对DOC的去除效果较差。三氯化铁对小分子质量的有机物具有很好的去除效果，总去除率的至少50％为去除小分子质量有机物所贡献。降低pH能有效地促进各分子质量区间的DOC和UV₂₅₄的去除，去除有机物的最佳pH为5．5。在最佳的pH下，小分子质量的有机物得到了最大限度的去除。

关键词: 强化混凝, 有机物的分子质量分布, 三氯化铁, 溶解性总有机碳, 在254nm处的紫外吸光值

Abstract:

Ferric chloride is used as a coagulant in this study. With varying dosage of coagulant and pH, the variation of DOC and UV₂₅₄ in every molecular weight region have been investigated to understand the efficiency and mechanism of removing organics by enhanced coagulation. Increased dosage can remove UV₂₅₄ more effectively than DOC for every molecular weight region. Smaller than 1k molecular weight of organics is removed effectively by ferric chloride, which account for at least 50% of overall rate of removal. Decreased pH can remove both DOC and UV₂₅₄ effectively. Optimal pH for the removal of organics is 5.5,at which small molecular weight orpanics is removed to a great extent.

Key words: enhanced coagulation, molecular weight distribution of organics, ferric chloride, DOC, UV₂₅₄

中图分类号: 

• TU991.2