The reclaimed water system consists of an organic combination of engineering facilities such as the collection, storage, treatment of reclaimed water, and reclaimed water supply. It is one of the functional supporting facilities for buildings or building communities. Building reclaimed water has different titles due to the different scopes of reclaimed water system establishment. Building reclaimed water is a reclaimed water system established in one or several buildings; residential reclaimed water is a reclaimed water system established in a community. The community mainly refers to the residential community, but also includes the centralized construction area such as colleges and government agencies, collectively referred to as the construction community. Building water is the general term for building water and community water.
According to the scope and scale of its supply, reclaimed water treatment and reuse systems generally fall into the following four categories:
The water source in the system is taken from the miscellaneous water and high-quality miscellaneous drainage in the system. The drained water is used for flushing toilets, cleaning vehicles, greening, etc. in the building after being treated by the flow collection. The treatment facilities can be located inside the building or near the outside according to the conditions. For example, the water treatment equipment of Beijing New Wanshou Hotel is located in the basement.
In areas with incomplete urban drainage systems, the water treatment facilities do not meet the secondary treatment standards, and the reuse of reclaimed water can reduce the re-pollution of sewage to local rivers. The water source in the system is taken from the building’s tough drainage purification tank (such as sedimentation tank, septic tank, degreasing tank, etc.), and the water in the tank is the total domestic sewage. The system processing facilities can be located indoors or outdoors according to conditions.
The reclaimed water source of the system is taken from the miscellaneous drainage produced by each building in the building district. This system can be used to build residential quarters, schools, and government agencies and organizations. Its processing facilities are placed in the community.
The system is characterized by secondary sewage treatment facilities in a small area. The water source in the area can be treated by urban sewage treatment plants or industrial waste water. This water can be transported to the regional reclaimed water treatment station for further advanced treatment and flushing in the building. Purposes such as toilet and greening.