The per capita water resources in China are 23.6 cubic meters, accounting for only one quarter of the world's total per capita water resources. China is one of the 13 water-poor countries in the world. Among the over 600 administrative cities across the country, nearly 400 cities are short of water, among which more than 130 are severely short of water. Surface organic pollutants are widespread in the seven major river basins across the country. In particular, the organic pollution of rivers running through cities is severe, the eutrophication of main lakes is prominent, and the groundwater in most cities has been polluted to a certain extent. Water shortage and water environmental pollution have become important factors restricting the economic and social development of our country. Reclaimed water reuse is an important way to solve the problems of urban pollution and water shortage.
The practical significance of reusing reclaimed water from sewage
Due to the water quality and facilities named between the water supply and the sewage. The water used refers to the water used in People's Daily life and production, which is collected, recycled and treated, and then used for floor cleaning, gardening, car washing, air conditioning cooling, toilet flushing, fire fighting, and landscape lighting. It does not meet the direct contact requirements of human miscellaneous water. Sewage and the water used in this method is water reuse, which has the following three characteristics: water reuse can reduce the treatment load in sewage treatment plants, water reuse can promote the effective utilization of regional water resources by effectively implementing the investment scale, and in addition, it can also promote the efficient use of regional water resources. Secondly, the reuse of reclaimed water does not affect human health, has no unpleasant smell or visual discomfort during use, and does not affect corrosion, pipe blockage, sanitary equipment, etc. At the same time, stable and reliable water treatment technology is required. We must establish corresponding evaluation indicators at the same time to facilitate supervision, management and testing, while maintaining necessary water quality conditions and the economic cost of treatment requirements. Reasonable and so on. Third, the water quality must meet certain quality standards.
