By 2025, the total scale of seawater desalination

2022-07-30
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By 2025, the total scale of national seawater desalination will reach more than 2.9 million tons/day

release date: Source: People's Overseas Edition

by 2025, the total scale of national seawater desalination will reach more than 2.9 million tons/day

ask for fresh water from seawater

seawater is salty and bitter, which can neither be used for irrigation nor for industrial production. However, the desalinated seawater has the characteristics of excellent water quality and stable water volume, which can effectively alleviate the shortage of water resources in coastal areas

by 2025, the total scale of seawater desalination in China will reach more than 2.9 million tons/day. Recently, the national development and Reform Commission and the Ministry of natural resources jointly issued the action plan for the development of seawater desalination utilization (year) (hereinafter referred to as the action plan), which set the goal for the development of seawater desalination industry during the 14th Five Year Plan period

what are the conditions for us to ask for fresh water from seawater? How does the policy support it

"barren" becomes "treasure land", greatly alleviating the shortage of water resources -

great desalination effect

"this is the largest desalination base in China." The person in charge of Tianjin SDIC Jinneng Power Generation Co., Ltd. (hereinafter referred to as SDIC Beijiang) proudly introduced in an interview

17 years ago, the northern Xinjiang of SDIC was still a desolate saline alkali beach in the outer suburbs of Tianjin. The enterprise adopts the circular economy mode of "power generation - heat supply - desalination of seawater - salt production from concentrated seawater - land conservation and Consolidation - waste recycling", and gradually develops the "barren" under its feet into a "treasure land" integrating seawater desalination, power generation engineering, salt production from concentrated seawater, heat supply, land consolidation and development and waste recycling

"at present, the water production capacity of SDIC Beijiang phase I sea fresh water project is 200000 tons/day. At present, the total water production capacity of the enterprise is about 80000 tons/day, including 30000 tons/day for self consumption, 20000 tons/day for municipal water supply and 30000 tons/day for industrial water supply. Two new water users are under construction and have formed an intention of 50000 tons/day." The official said

where is the "cow" of seawater desalination? Why is it so valued

according to the relevant person in charge of the national development and Reform Commission, China's 11 coastal provinces (autonomous regions and municipalities) have created 55% of the GDP, while the total amount of water resources accounts for only 27% of the country, which has become a bottleneck constraint on economic and social development. In particular, 51 of the 55 coastal cities above prefecture level are water deficient cities, and all the 12 island counties are water deficient counties. The contradiction between supply and demand of water resources is very prominent. "Seawater desalination is an important high-quality incremental water source, which is of great significance to alleviate the shortage of water resources in coastal areas and islands and ensure water security."

internationally, seawater desalination has been used on a large scale. The global desalination capacity has grown from less than 30million tons/day in 2000 to 100million tons/day in 2020, with an average annual growth rate of more than 7%. The water production cost of seawater desalination has decreased from $10/ton in the 1970s to less than $1/ton at present

domestically, 123 seawater desalination projects have been built in China, with a seawater desalination capacity of more than 1.6 million cubic meters/day. It is one of the few countries in the world with seawater desalination technology, and has the technical conditions and industrial foundation for large-scale development

"however, we should also see that there is still a certain gap between the large-scale utilization level of seawater desalination in China and the growing domestic demand." The above person in charge said, "the overall scale of seawater desalination is relatively small, there is still a gap between key technologies and the international advanced level, and there are certain obstacles to the entry of seawater desalination water in many places. In addition, there are problems such as the lack of convergence of relevant standards and specifications and insufficient incentive measures."

the action plan jointly issued by the national development and Reform Commission and the Ministry of natural resources puts forward clear goals: by 2025, the new scale of seawater desalination will be more than 1.25 million tons/day, of which the new scale of seawater desalination in coastal cities will be more than 1.05 million tons/day, and the new scale of seawater desalination in island areas will be more than 200000 tons/day; The key core technology and equipment of seawater desalination are independently controllable, and the modernization level of industrial chain and supply chain is further improved; The standard system for seawater desalination utilization and development is basically sound, and the policy mechanism is more perfect

strengthen technology research and development, equipment upgrading and Transformation -

solve the problem of independent innovation

where is the difficulty of seawater desalination

"in previous years, the key technology of seawater desalination equipment has been monopolized by large foreign companies for a long time. The equipment and technology are controlled by pressing the" oil pump "button on the control panel, which is one of the bottlenecks of our development." According to the relevant person in charge of SDIC Northern Xinjiang, the most advanced thermal low-temperature multi effect seawater desalination technology of Israeli ide company was adopted during the construction of SDIC Northern Xinjiang phase I seawater desalination project. The equipment operates stably, but the unit cost of water production is high. Since the operation of the equipment, the enterprise has gradually reduced the unit consumption of water production and improved the operation efficiency of seawater desalination through measures such as optimization of operation mode, replacement of operating chemicals, equipment upgrading and transformation, and key technology innovation

"for example, in the original design of the seawater desalination device, there is no pH adjustment device, and the pH of the outlet water is maintained between 5..5, which cannot meet the requirements of pH 6.5 of the external domestic water." The person in charge said, "the enterprise independently designed and installed a pH adjustment device to completely solve the pH problem of sea fresh water products, and successfully applied for national invention and utility model patents."

"developed countries are leading in basic research, technology research and development, equipment development and other indicators of seawater desalination." Gao Congyi, President of the China desalination and water reuse society, introduced, "for example, the reverse osmosis membrane developed by the United States and Japan occupies most of the international market with its advantages of large flux, long service life and high desalination rate; the energy recovery devices developed by the United States and Switzerland occupy an absolute advantage with a high recovery rate of more than 95% and high stability; the highly reliable seawater high-pressure pumps developed by Germany and Denmark show a rolling trend in the domestic market."

the action plan has made relevant specific arrangements to solve the "stuck neck" technical problems and strengthen independent innovation

according to the relevant person in charge of the Ministry of natural resources, the action plan proposes to carry out scientific and technological innovation in super large-scale membrane process, thermal desalination and high-value utilization of concentrated brine, build a national technological innovation center for seawater resource utilization, focus on breakthrough in reverse osmosis membrane components, high-pressure pumps, energy recovery devices, etc., and promote the technical indicators of relevant equipment and materials to reach the international advanced level. At the same time, a large-scale seawater desalination test site will be built to improve the service capacity of customized trial production, inspection and testing, process research, verification and evaluation, technology maturation, type approval and standardization. In addition, demonstration projects for seawater desalination utilization were carried out in cities and industrial parks, and large-scale seawater desalination demonstration projects of 100000-300000 tons/day were built according to local conditions

"the release and implementation of the action plan is of great significance for mastering the key core technical equipment of seawater desalination as soon as possible." Gao Congyi said, "it is suggested that relevant departments deploy key special projects for the core tasks proposed in the action plan, ensure the implementation of technology research and development, integration demonstration and other tasks, aim at the forefront of the field, strengthen basic research and consolidate the foundation of scientific and technological innovation."

"the quality is determined according to the demand, the supply is determined according to the demand, and the distribution is based on the demand" --

ensure that there are users for desalination of seawater

desalination. It is necessary to break through the technical difficulties and open up the supply path

SDIC North Xinjiang desalination is facing the challenge of poor water supply. "SDIC North Xinjiang has high-quality desalinated aquatic products, and the best user is large-scale industrial and chemical enterprises. However, due to planning adjustment and other reasons, there are no high-quality large-scale industrial and chemical enterprises around SDIC North Xinjiang." The person in charge of the enterprise said, "some enterprises in the adjacent areas have water demand, but lack of water supply pipes. As a result, SDIC Beijiang desalinated water can only be sold at a low price and in a planned way, failing to achieve a good fit between 'high-quality water supply' and 'high-quality demand'."

seawater desalination has strong public welfare, which requires both active market participation and government guidance. According to the relevant person in charge of the Ministry of natural resources, the action plan focuses on the following aspects to promote the large-scale utilization of seawater desalination

first of all, define the positioning of seawater desalination water. The action plan requires coastal water shortage areas to incorporate desalinated water into regional water resources planning and unified allocation of water resources, and to increase the allocation proportion of desalinated water in water resources year by year as a supplementary water source for living, a new municipal water supply and an important emergency standby water source

secondly, take multiple measures to promote the application of seawater desalination. The action plan proposes that regions with the conditions should make full use of the capacity of existing desalination projects, plan to implement a number of new desalination projects and supporting pipe facilities, expand the scale of desalination utilization in industrial parks, improve the water supply capacity of islands and ships, and expand the application field of desalination technology

in addition, incentive measures will be strengthened. Encourage the government to purchase services or subsidies and other special raw materials to promote the desalination water for urban public and municipal water supply in the most suitable way when there is a large gap between the strength of the finished products and the testing. We will encourage the "water replenishment by electricity" of combined hydropower production, and implement preferential policies such as exemption of electricity demand (capacity) and enterprise income tax credit. Encourage banking financial institutions to increase credit support, and encourage social capital to actively participate in such diversified ways as PPP

"only when the problem of water supply and consumption integration is solved, can desalinated seawater have uses and users, and truly become an effective supplement to traditional water resources in coastal areas." Zhangyingjian, director of the resources and environment business department of International Engineering Consulting Co., Ltd., which mainly tests the mechanical bearing capacity of materials such as hardness, tension, pressure, impact, temperature, stripping, etc., said that the action plan proposed that coastal areas should take into account industrial policies, local freshwater resources and seawater utilization capacity, and reasonably plan the construction of industrial parks and the agglomeration of high water consuming industries, Formulate an annual work plan for seawater desalination and direct utilization of seawater, which will promote the full use of seawater after desalination

"we have confidence in the future development of seawater desalination!" The relevant person in charge of SDIC Northern Xinjiang said, "in the future, we will focus on taking a two legged approach, vigorously develop market water, expand new users in the high-end market, and improve the utilization and operation level of seawater desalination on the premise of ensuring the stable supply of planned water."

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