In the traditional concept, sewage is generally collected and transported to a large sewage treatment plant far away from the city for treatment, and finally discharged into the receiving water body. However, the construction concept of the traditional sewage treatment plant can no longer meet the construction demand of sewage recycling, because the produced recycled water needs to be transported to the city through a long-distance pipe network for reuse, resulting in high energy consumption of long-distance transportation and high maintenance cost of the pipeline system. Therefore, the dispersion of sewage treatment plant will be a development direction in the future.

      With the transformation of sewage treatment plant from the original concept of sewage treatment only to the direction of "water resource regeneration center" or "water cleaning facilities", sewage treatment will also turn to the recycling of sewage, the recycling of nutrients and useful resources, the recycling of waste heat and potential energy in sewage, the development of renewable energy such as wind energy and solar energy, and the rain through the concept of green infrastructure Water management and other directions.