In thermal power plants,desulfurization wastewater is one of the most intractable problem and the zero liquid discharge(ZLD)of desulfurization wastewater is the key to zero liquid discharge of industrial wastewater.The components of desulfurization wastewater are complex and the water quality fluctuates greatly.The efficient and stable pretreatment plays a crucial role in the subsequent concentration and evaporation crystallization.In this paper,the pretreatment process of desulfurization wastewater in recent years is summarized,which is divided into two parts:softening and solid-liquid separation.The shortcomings of the existing process are analyzed,and the development of new treatment technology are introduced.
NETL
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