Reused water (also called recycled water) refers to water resources that are reused after treatment of wastewater. Scientific use of recycled water can effectively solve the problem of water shortage. Reused water can be used for agricultural irrigation, urban water supply, industrial water, and environmental restoration. It can reduce the pressure on fresh water resources, improve the utilization efficiency of water resources, and protect the ecological environment.
In order to scientifically use recycled water, it is first necessary to establish a sound recycled water treatment system. The reuse water treatment system should include wastewater collection, pretreatment, advanced treatment, disinfection and other links to ensure that the treated water quality meets the standards for reuse. Wastewater collection can be carried out by establishing a sewer system or building decentralized collection facilities to collect wastewater into a unified treatment plant. Pretreatment includes rough screening, sand precipitation, pH adjustment and other treatments of wastewater to remove impurities and adjust water quality. Advanced treatment can use biological treatment, membrane separation, adsorption and other processes to remove organic matter, nitrogen and phosphorus and other pollutants. Then, the treated water is disinfected to ensure safe water quality.
Secondly, the scientific use of recycled water also requires the establishment of corresponding management systems and policy support. Establish a recycled water management system, clarify the scope of use, water quality standards, control measures, etc. of recycled water, and standardize and supervise the use of recycled water. The government can formulate corresponding laws and regulations to encourage and support the development and utilization of recycled water. At the same time, corresponding economic incentive policies should be formulated to reduce the cost of recycled water treatment and utilization and improve the competitiveness of recycled water. In addition, it is necessary to strengthen the training and promotion of recycled water knowledge and technology, improve the professional quality of relevant practitioners, and promote the scientific use of recycled water.
Agricultural irrigation is one of the important utilization areas of recycled water. Scientific use of recycled water can reduce the pressure on fresh water resources, improve the efficiency of farmland irrigation, and promote sustainable development of agriculture. In agricultural irrigation, the treated recycled water can be used directly for irrigation or mixed with fresh water. Reused water is rich in organic matter, nitrogen and phosphorus and other nutrients, which can provide nutrients needed by plants and reduce the use of chemical fertilizers in farmland. However, recycled water may contain some harmful substances, such as heavy metals, organic pollutants, etc., which need to be properly treated and monitored to ensure the safety of irrigation water quality.
Urban water supply is another important area of reuse water. Scientific use of recycled water can provide reliable urban water supply resources and reduce the pressure on the exploitation of groundwater and river water resources. Reuse water can be built by building a reuse water pipe network to supply the treated reuse water to urban residents for use. In urban water supply, secondary disinfection of recycled water needs to be carried out to ensure that water quality meets drinking water standards. In addition, it is necessary to strengthen publicity and education on recycled water, increase public acceptance and recognition of recycled water, and promote the widespread application of recycled water.
Industrial water is also one of the important utilization areas of recycled water. Many industrial processes require large amounts of water resources, and recycled water can provide a reliable source of water and reduce industrial water costs. Scientific use of recycled water can reduce the consumption of natural water resources, reduce wastewater emissions, and protect the environment. In industrial water, appropriate pretreatment and advanced treatment of recycled water need to be carried out according to specific process requirements and water quality standards to ensure the quality and stability of recycled water.
In addition, recycled water can also be used for environmental restoration. Some areas are polluted by heavy metals, organic pollutants, etc., and require soil and groundwater restoration. Scientific use of recycled water can be used as a water source during the restoration process and accelerate the restoration of soil and groundwater. In environmental restoration, reuse water needs to be properly treated and monitored to ensure that no secondary pollution occurs during the restoration process.
To sum up, the scientific use of recycled water is one of the important ways to solve the problem of water shortage. By establishing a sound reuse water treatment system, establishing management systems and policy support, the rational use of reuse water can reduce the pressure on fresh water resources, improve the utilization efficiency of water resources, and protect the ecological environment. Reused water can be used in agricultural irrigation, urban water supply, industrial water and environmental restoration to achieve the goal of sustainable development. However, it should be noted that the scientific use of recycled water requires the establishment of a scientific monitoring mechanism to ensure water quality safety and protect public health. At the same time, it is also necessary to strengthen publicity and education on recycled water to increase public acceptance and recognition of recycled water.