China's total freshwater storage capacity is 2800 billion cubic meters, accounting for 6% of the world's total water resources, making it the fourth largest freshwater storage country in the world. However, China is also a country with a serious water shortage, as it consumes the most water in the world, accounting for 13% of the world's total water usage every year. The shortage of freshwater resources has forced China to accelerate the promotion of environmental protection technologies, and reclaimed water reuse technology is currently recognized as a means of energy conservation and emission reduction.

Reclaimed water reuse technology is a means of collecting, treating, and reusing wastewater. This technology originated in Japan and is currently widely used in the United States and Japan, as well as in Europe and the Middle East. The technology is already very mature. In China, the application of reclaimed water reuse technology actually began as early as the 1970s and 1980s. However, due to the scarcity of water resources in China at that time, people's awareness of environmental protection and energy conservation and emission reduction was relatively weak. However, with the severe drought situation in many regions of China in recent years, coupled with frequent water pollution incidents, people's environmental awareness has become increasingly strong. Governments in many regions have forced enterprises to introduce reclaimed water reuse and treatment systems in order to continue production. They also regularly inspect the water use and pollution discharge situation of enterprises, strictly monitor each factory, and ensure that serious pollution incidents do not occur.

　　The reuse technology of reclaimed water is of great significance for environmental protection in China. On the one hand, it can reduce the use of freshwater resources and use treated reclaimed water for irrigation, flower watering, cleaning, etc. This can greatly reduce the amount of freshwater used by residents and enterprises. On the other hand, utilizing reclaimed water reuse technology can reduce the amount of wastewater discharged by enterprises. The wastewater generated by enterprises can be recycled after treatment, greatly reducing the cost of purchasing water and discharging pollutants for enterprises, reducing production costs, and improving market competitiveness.