Qingdao City Water Supply Management Ensures Water Quality Safety-【3M Filter Element】

Qingdao City Water Supply Management Ensures Water Quality Safety u003cbru003e u003cbru003eQuestion 1: Can the desalinated seawater be consumed? u003cbru003eIt can be drinkable after desalination, pH adjustment, and mineral increase; the water quality meets national standards u003cbru003e According to reports, the follow-up treatment mainly includes the addition of carbon dioxide, calcium hydroxide and sodium hypochlorite, which can adjust the PH value, increase the hardness of the water, enhance the stability of the water and the drinking comfort, and at the same time, disinfect the water to prevent water distribution. Microbial contamination in the pipe network. u003cbru003e 'The quality of the final desalinated seawater fully meets the 106 index requirements of China's 'Sanitary Standards for Drinking Water' (GB5749-2006).' Jordi said. u003cbru003e Tianjin, also a coastal water-scarce city, is also using desalinated seawater, with a daily production capacity of 220,000 tons. Take the Tianjin Beijiang Power Plant, the first batch of pilot units of the national circular economy as an example. The plant uses thermal methods to desalinate seawater. When cool seawater is heated, steam is generated, salt is precipitated, and the seawater is distilled into fresh water. The plant supplies 8,000 tons of desalinated water to the society every day, which is integrated into the municipal pipe network in Hangu, Binhai New Area for drinking. u003cbru003e 'After desalinated seawater and tap water are mixed, the hardness and alkalinity will be suitable for drinking.' said Zhang Guohui, director of Qingdao Water Supply Management Office. u003cbru003eQuestion 2: Does the pollution of water intake affect water quality? u003cbru003eThe desalination technology is very mature, and harmful substances can be removed u003cbru003e Some netizens questioned that there may be industrial pollution in Jiaozhou Bay, the source of water, which will affect the quality of desalinated seawater. In this regard, Jordi said, 'Seawater desalination is highly adaptable to raw seawater, and the reverse osmosis system has a desalination rate of 99.8%, and all harmful substances can be removed.' u003cbru003e 'From the current technology, no matter what kind of seawater desalination method can prevent pollutants from entering, the water quality will not be affected.' u003cbru003e Wang Haizeng, a professor at Ocean University of China, said that the double-membrane reverse osmosis seawater desalination technology has been very mature. 'Drinking desalinated seawater is a new thing in our country, but it has been widely used in many countries. The United States, Australia, Singapore and other countries are all carrying out seawater desalination. China's seawater desalination accounts for a very low proportion of the world.' u003cbru003eQuestion 3: Will the desalination process cause secondary pollution? u003cbru003eRegular maintenance and replacement of seawater desalination membranes; real-time detection of desalinated water to ensure water quality safety u003cbru003eTang Na said that reverse osmosis membranes have a certain life span, usually 3 to 5 years. If they are not replaced in time, desalination costs will increase. Therefore, desalination plants will replace reverse osmosis membranes in time. u003cbru003e Zhang Guohui said that since 2006, Qingdao City has implemented a system of urban water supply quality bulletins. 'We organize weekly sampling inspections of the factory water and pipe network water in the four districts of the city and the whole city every month, and conduct a full analysis of the water quality of the city’s source water, factory water and pipe network water throughout the year, and pass the sampling results. The news media and government website publicity.' Zhang Guohui said, 'For desalinated seawater, we not only conduct regular testing, but also real-time online testing to ensure the safety of water quality.' u003cbru003eQuestion 4: Should desalination be vigorously promoted? u003cbru003eIt can save groundwater resources, there is no technical bottleneck, but the production and use costs are high u003cbru003e Qingdao has 295 cubic meters of water resources per capita, which is only 12% of the national average. 'Utilizing external water sources has a large investment and a long cycle. Utilizing seawater can save groundwater resources and is the fundamental way to solve the shortage of freshwater resources in Qingdao.' Zhang Guohui said. u003cbru003e According to reports, Qingdao passed the 'Qingdao Desalination Industry Development Plan' as early as 2006. In recent years, a number of seawater comprehensive utilization projects have been completed. Li Zhenjun, director of the Energy Conservation Office of the Qingdao Development and Reform Commission, said, “The Baifa desalination project is only one of Qingdao’s comprehensive utilization of seawater and the promotion of desalination projects.” Regarding the question of whether desalination will push up water prices, Li Zhenjun said, “From the current situation. , Qingdao’s water price will not increase due to desalinated seawater, and a hearing will be held for comments before the water price is adjusted.' u003cbru003e In another water-scarce city, Tianjin, desalinated seawater for drinking is currently provided to the municipal pipeline network for free. 'We believe that first use desalinated seawater as water resources, and then consider the feasibility of the next step.' u003cbru003eProfessor Tang Na believes that seawater desalination has no technical bottleneck, but there are still many obstacles in terms of water price policy, water use mechanism and municipal pipeline network. u003cbru003e It is understood that an important reason why desalination is not easy to promote is the high production and use costs. Tianjin’s desalinated seawater is mainly used in industry. Qi Dongsheng, the production manager of Zhongsha Company, said: “The price of buying desalinated seawater is about 7 yuan per ton, which is much higher than that of tap water and groundwater. From the perspective of developing a circular economy, it is worth ! But the cost of water is still a bit higher.” At the same time, for the use of desalinated seawater, some experts believe that the steps of industrialization and then civilian use may be better.