Water is an essential natural resource for all life and human development. Without water and without a living world, there is no such thing as we have today. Protecting water resources and using water resources reasonably and effectively are important measures to ease the water shortage in our country. Among them, the water reuse is the main content of this important measure. Water reuse can save water, energy saving, reduce pollution, a water and more, the use of sewage resources. To build a water project can not only improve the water supply system but also obtain social and economic benefits.
First, the understanding of water
Water "is also referred to as" recycled water "or" recycled water "or" recycled water "mainly refers to miscellaneous water of non-potable water that has been treated to a certain water quality standard and reusable within a certain range Water quality is between that of Sheung Shui and sewers, and is a form of effective utilization of water resources.
Second, the water reuse advantage
The current trend of rising water prices, so that water-saving methods have become the focus of attention, resulting in a large number of water-saving methods, inexpensive water in the water began to be popular, according to the data show that take water facilities tons of water infrastructure investment of 3,000 yuan / (M3 / d), tons of water operating costs 1.60 yuan / m3 (including depreciation). The analysis of the direct economic benefits of the water facilities in the building shows that after the completion of the water facilities, the construction cost borne by each person is 120 Yuan, and the added cost of the developers only accounts for 3 ‰ of the total cost. The static state of the water facilities The payback period of investment is 3.42 years. It can be seen that the water facilities did not increase the financial burden on the construction units and end-users of the newly-built projects. Under the condition of maintaining a reasonable price difference between the cost of the water and the tap water, Has a good profitability.
Third, the application at home and abroad
1. Application in foreign countries
   Water reuse in foreign countries have been implemented for a long time, large-scale reuse, has shown obvious economic benefits. In the current world, many countries have tried to overcome the difficulties of water resources and opened up urban sewage to the second freshwater resources. The United States is one of the earliest countries to adopt wastewater recycling in the world. Large-scale wastewater treatment plant construction began in the 1970s. In 1979, 357 cities in the United States reused sewage for reuse in urban areas, agricultural reuse, recreational reuse , Environmental reuse, industrial reuse and so on. In addition to the United States, Japan, Israel and many other countries have already realized the reuse of water and have rich experience to meet or partially meet the needs due to lack of water resources and have received good economic and social benefits.
2 in our country's application
    Our country's freshwater resources are scarce, and the drainage facilities and management are imperfect. However, we have realized the importance and urgency of reclaimed water and the rational utilization of reclaimed water resources can not only alleviate the shortage of water sources, but also improve the environment and achieve water Sustainable development of resources.
With the improvement of people's living standard and the improvement of industrial wastewater reuse rate, the proportion of domestic sewage to urban sewage is increasing. At present, the range of reclaimed water will also be greater, which can be used for landscaping and river replenishment , Flushing toilets in public parks and flushing water in roads in parks, cooperating with urban environmental management, community water use, washing water for intermediate-use water, industrial cooling water, aquaculture, water for trains and ships. Therefore, the establishment of a water system not only solves the problem of lack of water resources, but also obtains certain economic benefits and is not a good measure for both.