Research progress of greywater treatment technology at home and abroad

The collection and treatment of domestic wastewater by quality, especially the treatment and reuse of greywater,can realize the resource utilization of wastewater and save energy. Firstly, the basic concept of quality-based separation and collection of domestic wastewater and the characteristics of greywater quality and quantity were introduced. The research progress of greywater treatment technologies, such as filtration, membrane separation, MBR, constructed wetland, ecological filter and so on were reviewed,and the effects of different types of treatment technologies were compared and analyzed. The results showed that single physical treatment technology had limited removal effect on organic matter surfactants and other components. Generally, other treatment technologies needed to be supplemented to achieve the purpose of greywater regeneration and reuse. Chemical treatment technology could effectively remove SS and surfactants in low-intensity greywater. Biological and ecological treatment technologies were two kinds of technologies widely used in greywater treatment, among which constructed wetland and MBR were the two most potential greywater treatment and reuse technologies. Finally, according to the research status of greywater treatment technologies, the research focus in the field of graywater treatment in the future was put forward.