城市污水深度脱色技术研究进展

城市污水厂二级生物处理出水中的色度物质构成复杂且难以处理，随着排放标准日益严格和再生水用量的不断提高，解决色度问题逐渐成为研究热点。本文介绍了色度的概念和组成，总结了国内外研究者利用混凝、氧化技术、膜过滤技术和组合工艺去除色度的效果和机理，分析了影响其脱色效果的因素，并简要评述了各项技术的应用前景。总结发现，纳滤（去除率90%～100%）、臭氧及光催化及其组合工艺（60%～80%）效果最优，其次是混凝、超滤及其组合工艺（50%），而微滤、含氯氧化剂及紫外照射工艺脱色效果较差。最后对本领域的发展前景作了展望，提出研究色度物质的来源及构成，关注脱色工艺性能及复色的可能性，以及实现脱色、消毒和去除微量有机物的多功能性，将是未来的研究重点。

A review of advanced color removal in municipal wastewater

The colored organic matter (CDOM) in the secondary effluent of wastewater treatment plants(WWTPs) has complicated components，which makes it difficult to remove. This paper reviewed the concepts and components of CDOM in WWTPs effluents and various treatment methods that may be employed in the reduction of CDOM. These processes include flocculation，oxidation process，membrane technology and combined processes. The removal efficiencies and mechanism were summarized，influencing factors，comments and prospective applications of each method were analyzed as well. It was concluded that nanofiltration (removal rate 90%—100%)，ozone，photocatalysis oxidation and their combined processes (60%—80%) possess the best removal efficiencies. The removal efficiencies of coagulation，ultrafiltraion and their combined processes (50%) are not as good as that of the above methods，but better than that of microfiltration，chlorine oxidizer and UV radiation. Future research in this field should focus on the source and composition of CDOM，the versatility performance of color as well as disinfection and trace organic matters removal，and the possibility of recolor of effluent.