Application and Product Standard of Purified Crystalline Salt from Desulfurization Wastewater of Thermal Power Plant

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.