Municipal water treatment includes municipal tap water treatment, municipal sewage treatment and some rural water treatment. With the acceleration of urbanization and industrialization, on the one hand, water consumption has increased, water resources have been scarce, water quality has deteriorated, and on the other hand, domestic sewage pollution has become increasingly serious, and urban sewage treatment has become more and more. Double pressures have led to an increase in water supply requirements. How to effectively treat domestic sewage has become an important factor in urban development and sustainable socio-economic development.

With the understanding of the world, the water quality standards have gradually improved, especially since the beginning of the 21st century, the impact of industrial production by-products on the environment and human health has become prominent. Membrane method for municipal water supply can effectively solve the problem of national water supply bidding.