The improvement of sewage treatment capacity and effluent quality lays a foundation for the utilization of recycled water



In recent years, the construction of sewage treatment facilities in China has developed rapidly, and the treatment capacity and effluent quality have been continuously improved, laying a good foundation for the utilization of recycled water. The guidelines require that all regions rationally lay out infrastructure for the utilization of recycled water on the basis of existing sewage treatment plants; The newly built urban areas of severe water shortage cities should plan and layout the reclaimed water pipe network in advance according to local conditions and carry out the construction in an orderly manner.

Hu Hongying believes that a series of measures proposed in the "Guiding Opinions" are effective measures that meet the reality of our country, which can improve the supply capacity of water resources, alleviate the contradiction between supply and demand, reduce water pollution, and ensure water ecological security, which is of great significance for promoting the construction of ecological civilization and achieving high-quality development.

The utilization rate of recycled water in China is only about 13%

With the further development of water pollution prevention and control, China's sewage treatment has developed rapidly and achieved remarkable results, but the resource utilization of sewage is still at a low level.

"At present, China's urban sewage discharge is about 75 billion cubic meters, and the amount of renewable water conservancy is less than 10 billion cubic meters." Hu Hongying pointed out that for the utilization of sewage resources, there is a lack of coordination in the policy, planning, supervision and management of relevant government departments. The lack of coordination in sewage collection and recycling treatment, and the mixing of industrial wastewater into urban sewage systems increase the environmental risks of recycled water and sludge utilization.

In addition, the price mechanism of recycled water is not perfect, and the lack of reasonable charging and incentive mechanism leads to the low enthusiasm of enterprises for recycled water for ecological environment replenishment. Lack of sewage resource utilization target determination mechanism, supervision and management system is not perfect, leading to the difficult to achieve the planning target.

Reclaimed water is the most realistic water source at present, and should be promoted

The "Guiding Opinions" put forward that we should accelerate the resource utilization of urban domestic sewage, actively promote the resource utilization of industrial wastewater, and steadily promote the resource utilization of agricultural and rural sewage. We will build facilities for the collection and utilization of sewage, recycle regional reclaimed water, recycle industrial wastewater, promote the use of agricultural and rural sewage, carry out pilot projects for scientific and technological innovation of near-zero sewage discharge, and comprehensively carry out pilot demonstrations for the utilization and utilization of sewage resources.

"The quantity of urban sewage is large, the quality is stable, the nearby is advisable, the utilization potential is huge, and the potential benefits are significant." Hu Hongying said, therefore, the "Guiding Opinions" requires that all regions based on existing sewage treatment plants, reasonable layout of recycled water utilization infrastructure; The newly built urban areas of severe water shortage cities should plan and layout the reclaimed water pipe network in advance according to local conditions and carry out the construction in an orderly manner.

In the north of China, there is a serious shortage of water and ecological base flow. The water body in south China is seriously polluted and the black and odorous phenomenon is prominent. Ecological replenishment is one of the key measures of water environment management. Hu Hongying said that recycled water is available nearby and is the most realistic water source at present, which should be promoted. At present, the effluent quality of most urban sewage treatment plants in China is good, especially the main water quality indicators such as chemical oxygen demand, ammonia nitrogen and total phosphorus can meet or close to the requirements of environmental water bodies such as rivers and lakes, and the water quality is easy to ensure.

"In water-scarce areas, priority should be given to the effluent from the sewage treatment plant that meets the discharge standards, converted into usable water resources after further purification, the natural water body will be replenished in the nearest area, incorporated into the regional water resource allocation management, and recycled as a 'second water source' in the region, thus forming a regional recycled water recycling system." The system can realize the "three water co-governance" of water resources, water environment and water ecology, and the ecological environmental benefits and economic benefits are significant, and it is worth vigorously promoting." Hu Hongying said.

Water shortage areas should take reclaimed water as the priority water source and the first water source for industrial water

For the use of industrial recycled water, Hu Hongying suggested that in water-scarce areas, industrial enterprises and parks should work closely with urban recycled water production and operation units, plan and equip pipe network facilities, and use recycled water as the priority water source and the first water source for industrial water.

At the same time, the scientific and technological support of sewage resource utilization should be strengthened. Strengthen the basic research on the risk and control of sewage resource utilization, and develop the theory and method system of standard formulation of recycled water utilization; Research and development of integrated low-cost, high-performance waste water recycling and treatment technologies, processes and equipment.

In addition, we must improve the standard system for the utilization of sewage resources. Research on statistical methods and systems of sewage resource utilization, evaluation methods and norms of sewage resource utilization benefits, and form a scientific and unified statistical system. We will accelerate the formulation of technical specifications and risk management standards for the ecological and environmental utilization of recycled water, and gradually formulate and revise standards for the classification and quality of sewage resource utilization, evaluation standards and supervision standards.