回顾了城市饮用水净水技术发展的历史足迹，即20世纪初的第一代工艺——常规工艺和20世纪70年代的第二代工艺——深度处理工艺，并提出了第三代工艺——以超滤为核心技术的组合工艺；提出了城市水源突发污染的技术对策——针对污染物投加多种药剂；介绍了30年来由哈尔滨工业大学引领开发的新的饮用水净化技术——高锰酸钾及其复合剂净水技术。

This paper briefly introduced the evolution of purification technology for drinking water over time. After description of the 1st generation processes in the beginning of the 20th century—conventional processes and the 2nd generation processes in 1970s—advanced treatment processes, a tertiary processes—UF (ultrafiltration) based on integrated processes was proposed. Moreover, reaction measures (dosing variety of regents for different contaminants) for urban source water emergencies were illustrated in brief. A new technology of KMnO4 and potassium permanganate composite (PPC) for drinking water purification which was developed by Harbin Institute of Technology (HIT) was concisely introduced.

李圭白（1931—），男，河南偃师县人，中国工程院院士，主要从事市政工程研究