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Desalination of seawater when taking salt chemical route

China has become one of the fastest growing regions in the world for seawater desalination. It is estimated that the seawater desalination capacity will increase to 1.5 million to 2 million tons per day by 2015, and the scale of seawater desalination investment is expected to reach 20 billion yuan in the next five years. Faced with the opportunity of the development of seawater desalination projects, Tianjin, Dalian, Yingkou, Tangshan, Qingdao and other coastal cities around the Bohai Sea have planned to build large-scale desalination projects. However, at the 2011 Qingdao International Desalination and Water Recycling Conference held recently, some experts reminded that China's Bohai Rim region belongs to the inland sea, the seawater flow rate is slow, and there is no discharge condition of concentrated brine to deep sea after seawater desalination; experts also suggest that The scale of seawater desalination, the way out is to take the salt chemical route.

“The concentrated brine after seawater desalination in the Bohai Rim region has to be treated.” Wang Shuangcheng, general manager of the Israel Representative Office of Israel Desalination Technology Co., Ltd., told reporters that the 14 projects the company is doing overseas are all using high-pressure pumps. Discharged into the deep water area more than 10 meters. However, the Bohai Sea is different from the East China Sea and the Middle East. The sea water flow in China's East China Sea and the Middle East is fast. The direct discharge of concentrated salt water is still not significant. The circulation of the seawater is too slow. The concentration of brine will directly affect the survival of the organism. . Li Xinmin, a senior engineer at the Suzhou Thermal Power Research Institute, said that the exchange time between the seawater and the outer sea is 60 years. After the seawater is desalinated, the concentrated brine is continuously discharged, and the concentration is getting bigger and bigger.

Bao Jingling, chief engineer of the Tianjin Environmental Protection Bureau, further introduced that the offshore beaches in the Bohai Sea have a gentle terrain with shallow water depth and poor seawater exchange capacity, and do not have the conditions for discharge to the deep sea. The upper limit of the salinity of the main living organisms in the Bohai Sea is 33%. ~36%. When the salinity exceeds 40%. Some creatures will be extinct. In recent years, the reduction in seawater runoff has led to an increase in seawater salinity of 11% to 15% in Bohai Bay. If high salt water is discharged directly into the Bohai Bay, it will affect the ecological environment of the Bohai Sea, and some marine organisms that are sensitive to salinity, such as fish eggs and larvae, may die.

The effect of seawater desalination and warm water drainage on the increase of water temperature in coastal waters will also lead to the rapid proliferation and high concentration of some plankton, which may lead to “red tide” phenomenon, resulting in a large number of marine life deaths. Since 1980, red tides in the Bohai Sea have occurred frequently. The cycle is getting shorter and shorter and the area is getting bigger and bigger. To date, the total number of red tides has exceeded 300, with the longest one lasting 72 days.

According to the reporter's understanding, at present, China's companies engaged in seawater desalination, including companies engaged in general contracting, are only concerned with the two processes of seawater pretreatment, desalination and desalination, and do not pay attention to the treatment of desalinated concentrated brine. At present, the land area is tight, the industrial land occupation and the construction of the park cause the salt area to shrink continuously. The low-cost land or salt pool is not available. If the salt is evaporated, the cost of tons of salt will be reached. 350 to 400 yuan, the production cost of the mine salt is higher. “No one wants (using concentrated brine) to make salt.” Bai Yu, CEO of Beijing Akeling Desalination Co., Ltd., said that the concentrated seawater of the Akeling desalination project in Caofeidian New District was used as raw material for soda ash production of Sanyou Group. It can treat 18 million cubic meters of concentrated seawater every year, save 600,000 tons of raw salt and save 10 million cubic meters of water resources, greatly reducing the production cost of seawater desalination and salt chemical industry. Because of its cost advantage, Sanyou paid for the construction of the pipe network.

According to industry insiders, the geography and other conditions of seawater desalination close to salt chemical enterprises are not available. For example, Caofeidian New Area desalination project is used by Sanyou Group. From the perspective of encouraging resource utilization, the state should Subsidies are given to compensate for the high cost of evaporation of salt.

Zhang Yushan, director of the Comprehensive Utilization Research Office of the Tianjin Institute of Seawater Desalination and Comprehensive Utilization of the State Oceanic Administration, and Meng Hao, chief engineer of the Shandong Institute of Marine Chemical Science, said that China is different from the Middle East. The Middle East is rich in oil resources and does not see potassium in concentrated seawater. Bromine, magnesium, lithium and other materials, and these are still scarce mineral resources in China, from the perspective of environmental protection and resource utilization, need to be used. According to experts, since the concentration of these chemical components in concentrated brine is about twice that of seawater, the treatment of the same chemical resources is only half of the direct treatment of seawater, which can significantly reduce the extraction cost. In addition, the extraction of chemical resources from concentrated seawater does not require additional pretreatment equipment such as seawater and bacteria addition, which can greatly save investment and engineering cost, and the temperature and flow parameters of concentrated seawater generated during seawater desalination operation are stable, facilitating chemical resources. Stable operation during the extraction process.

Zhang Yushan said that with the scale of seawater desalination, it is necessary to comprehensively use concentrated brine. Experts also pointed out that China's forthcoming series of support policies for the development of seawater desalination industry should include the extraction and utilization of chemical resources in concentrated brine after seawater desalination, and encourage and support them.

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