Thinking and suggestions on the problem of wastewater treatment resource utilization

In the report to the 19th National Congress of the Communist Party of China, it was proposed to promote green development, build a market-oriented green technology innovation system, and develop and expand clean production and clean energy industries. The "13th Five-Year Plan" energy conservation and environmental protection Industry Development Plan also proposed to accelerate the development of energy conservation and environmental protection industry into a pillar industry of China's national economy. The recycling of industrial wastewater is the mainstream and the trend of The Times.

In September 2019, the National Development and Reform Commission, the Ministry of Ecology and Environment, and the Ministry of Industry and Information Technology jointly issued the "Cleaner Production Evaluation Index System for Sewage Treatment and Recycling Industry", which put forward a clear evaluation index system for cleaner production in sewage treatment and recycling industry, guiding and promoting enterprises in sewage treatment and recycling industry to implement cleaner production according to law and improve resource utilization rate. Reduce and avoid the production of pollutants, protect and improve the environment.

On January 11, 2021, the National Development and Reform Commission, the Ministry of Ecology and Environment, the Ministry of Science and Technology, the Ministry of Industry and Information Technology and other ten ministries and commissions jointly issued the "Guiding Opinions on Promoting the Resource Utilization of Sewage" (referred to as the "Opinions"), which put forward specific requirements for the resource utilization of industrial wastewater. The "Opinions" pointed out that: to carry out enterprise water audit, water efficiency standard and water-saving transformation, promote the recycling of industrial water within enterprises, and improve the reuse rate. Promote the integration and optimization of water use systems among enterprises in the park, and realize serial water use, differentiated water use, multi-use of one water and cascade utilization. We will improve the construction of wastewater treatment facilities in industrial enterprises and parks, improve operation and management, and ensure that industrial wastewater is discharged up to standards. We will carry out water quality monitoring, evaluation and water management for the recycling of industrial wastewater, and encourage local and key water enterprises to build smart management platforms for the recycling of industrial wastewater.

At present, China's sewage resource utilization is still in the initial stage, the development is insufficient and unbalanced, the overall utilization level is not high, and there is still a large gap with the requirements of building a beautiful China, and there are also problems such as imperfect standards, imperfect policies, and the level of technical equipment to be further improved. The Opinions put forward that the systematic utilization of sewage resources in urban, industrial, agricultural and rural areas should be carried out to comprehensively promote the utilization of sewage resources in China and achieve high-quality development. The key areas of sewage resource utilization include urban domestic sewage, industrial wastewater, agricultural and rural sewage, etc.

It is clear that by 2025, the national sewage collection efficiency will be significantly improved, the county and urban sewage treatment capacity will basically meet the needs of local economic and social development, and the sewage treatment in water environment sensitive areas will basically be upgraded; The utilization rate of recycled water in water-scarce cities at the prefecture level and above has reached more than 25%, and that in the Beijing-Tianjin-Hebei region has reached more than 35%. The reuse of industrial water, manure of livestock and poultry and the utilization of tail water resources in fishery and breeding have been significantly improved. A policy system and market mechanism for the utilization of sewage resources have been basically established. By 2035, a systematic, safe, environmentally friendly and economical sewage resource utilization pattern will be formed.

In order to ensure the effective implementation of the resource utilization of sewage in key areas, the "Opinions" also deployed and implemented key projects such as the construction of sewage collection and resource utilization facilities, regional recycled water recycling projects, industrial wastewater recycling projects, agricultural and rural sewage use promotion and treatment projects, sewage near-zero discharge scientific and technological innovation pilot projects, and comprehensive demonstration of sewage resource utilization pilot projects. It is proposed to improve the system and mechanism of sewage resource utilization from five aspects: perfecting laws and regulations, constructing policy system, perfecting price mechanism, perfecting financial policy and strengthening scientific and technological support.