Grayed water is called gray water (also called reclaimed water) because its water quality is between water supply (upper water) and drainage (sewer water). The building reclaimed water system is a water supply system that recycles the domestic sewage and wastewater used in the building or community after appropriate treatment as miscellaneous water in the building or community. It is suitable for cities with severe water shortages and areas lacking fresh water resources.
According to relevant statistics, 80% of urban water supply is converted into sewage. After collection and treatment, 70% of the recycled water can be recycled again. This means that through sewage reuse, the city's available water can be increased by at least 50% while the existing water supply remains unchanged.
All countries around the world attach great importance to the use of recycled water. As a legal alternative water source, recycled water is being used more and more widely and has become an important part of urban water resources.
There is a long way to go to utilize reclaimed water
In 2013, more than 50,000 cubic meters of clear "new water" was injected into the Golden Lake of Fengqing Park. What is different from the past is that this "new water" All come from recycled water - gray water. This is also the first large-scale use of reclaimed water to serve landscape water in Xi'an.
The "Xi'an Urban Sewage Treatment and Recycled Water Utilization Regulations" officially implemented on December 1, 2012 stipulates that for new, renovated, and expanded construction projects in all districts, counties, and development zones, the construction unit shall build supporting facilities Reclaimed water utilization facilities.
At the same time, the "Twelfth Five-Year Plan for Water Affairs Development in Xi'an" has planned water resource utilization goals: by 2015, the city's reclaimed water utilization rate will reach 30%. As a resource-based water-scarce city, Xi'an's use of reclaimed water is of great significance for saving water resources and improving water utilization. However, the investigation found that the utilization of reclaimed water in Xi'an is not satisfactory, and there is still a long way to go to make the reclaimed water flow farther.
Reference for the above content: Ifeng.com - Reclaimed water utilization has a long way to go. Don't let enterprises be "daunted by water"
Reference for the above content: Baidu Encyclopedia - Reclaimed water system