一、概述我国城市污水处理厂的建设与发展已有七十余年的历史,从1921年上海第一座污水处理厂投资以来,城市污水厂从无到有,从小到大,尤其是近十多年来,可以说有一个突飞猛进的发展。目前城市污水处理厂已覆盖了全国23个省市自治区,据93年的不完全统计,已建成和正在建设中的城市污 I. Overview The construction and development of urban sewage treatment plants in China have been in existence for more than seventy years. Since the first sewage treatment plant was invested in Shanghai in 1921, urban sewage plants have grown from nothing to small, especially to nearly ten Over the years, it can be said that there has been a rapid development. At present, the urban sewage treatment plant has covered 23 provinces and autonomous regions across the country. According to the incomplete statistics of 1993, urban sewage has been built and under construction