Abstract
：The shortage of water resources and the increasingly strict requirements of environmental protection make the zero discharge of waste water from thermal power plants imperative. The treatment of high salt desulfurization wastewater is the bottleneck of the application and promotion of "zero discharge" technology. The waste water zero discharge and resource recovery technologies such as salt separation and purification can be used to make sodium chloride crystal salt meeting the standards of "industrial salt" (GB/T 5462-2015) and sodium sulfate crystal salt meeting the standards of "industrial anhydrous sodium sulfate" (GB/T 6009-2014). However, due to the lack of related standards of certification index and certification method of crystal salt products, it is restricted to realize resource recovery as commodities. In this paper, the application field and product standard of purified crystalline salt from desulfurization wastewater are analyzed.
Highlights
As a large user of water and drainage, the water consumption of thermal power plants accounts for 20% of the total industrial water consumption
Due to the presence of organic impurities and heavy metals, mixed salt cannot be recycled and is soluble, which poses a high risk of secondary pollution. It needs to be managed as hazardous waste [6,7]
The cost of treating hazardous waste in China is basically more than 3,000 yuan/ton[9], which is even higher than the cost of producing crystallized salt, making it difficult for enterprises to bear
Summary
As a large user of water and drainage, the water consumption of thermal power plants accounts for 20% of the total industrial water consumption. Desulfurization waste water is the end waste water of thermal power plant, because of its complex composition, high salt content and difficult reuse, its treatment has become the key and difficult point of zero discharge of power plant waste water[1,2,3]. Due to the presence of organic impurities and heavy metals, mixed salt cannot be recycled and is soluble, which poses a high risk of secondary pollution. It needs to be managed as hazardous waste [6,7]. This paper analyzes the application and product standard of purified crystalline salt from desulfurization wastewater of thermal power plant, and discusses the feasibility of its application in chlor-alkali and soda ash industries
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