Recently, the State Oceanic Administration released the 2015 National Report on Seawater Utilization. The report shows that as of the end of 2015, 121 seawater desalination projects have been completed in the country with a water production scale of 1,008,800 tons / day and a maximum desalination project scale of 200,000 tons / day. Desalination mainly uses reverse osmosis and low temperature multi-effect distillation seawater desalination technology, water production costs 5 yuan to 8 yuan / ton. The report pointed out that China's marine water use industry was further promoted in 2015, achieving an added value of 1.4 billion yuan throughout the year, an increase of 7.8% over the same period of last year. Breakthroughs were made in the innovation and industrialization of seawater utilization, the construction of key equipment for small and medium sized desalination plants and the industrialization of comprehensive utilization of concentrated seawater in coastal areas. In 2015, there were 7 newly-built desalination projects in the country, and the newly-increased desalination water production scale was 666200 tons / day. As of the end of 2015, there were 31 seawater desalination projects with a capacity of 10,000 tons or above, 36 seawater desalination projects above the thousandth level and below 10,000 tons, and 54 seawater desalination projects below the kiloton level. In desalination, at present, China's related technologies reach or approach the international advanced level. Among them, Shenhua Guohua Zhoushan Power Plant independently designed and constructed 12,000 tons / day low temperature and more efficient and Baosteel Zhanjiang, Guangdong Steel Base 15,000 tons / day low temperature and more effect desalination project put into operation. Fujian Gulei Port Economic Development Zone 100,000 tons / day desalination project to complete the preliminary design of the project. The report shows that the end-users of the national desalination project are mainly divided into two categories: one is industrial water, one is domestic water. As of the end of 2015, the scale of desalinated water used for industrial water was 667,200 tons / day, accounting for 67.14% of the total. The project scale for residential water consumption is 331,325 tons / day, accounting for 32.84% of the total project size. In terms of direct utilization of seawater, the seawater cooling technology in 2015 was widely used in coastal thermal power, nuclear power and petrochemical industries in China, and the annual utilization of seawater increased steadily. As of the end of 2015, the annual use of seawater as a cooling water volume was 112.566 billion tons, of which 11.666 billion tons was newly added in 2015. In the utilization of seawater chemical resources, in addition to salt water, China's seawater to lift potassium, magnesium, bromine, also developed rapidly, the products include bromine, potassium chloride, magnesium chloride, magnesium sulfate. Among them, great progress has been made in the research on comprehensive utilization of concentrated seawater and industrialization of high value products, the completion of the technical transformation of industrial facilities for salt water beach facilities in concentrated seawater and automatic bromination of concentrated seawater to boost the transformation and upgrading of enterprises , Medicinal inorganic salt series to achieve large-scale production and put on the market.
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In 2015, China's seawater utilization industry realized an added value of 1.4 billion yuan