Research progress of zero discharge technology for desulfurization wastewater in coal-fired power plant
Wet limestone desulphurization technology is widely used in flue gas desulfurization of coal-fired power plant;however,the desulfurized wastewater treated by the said technology contains high concentrations of salinity and heavy metals.At present,desulflurized wastewater is commonly treated by triple combined boxes,while the said technology has many problems such as large reagent dosage,large sludge output,part indexes can't reach the standard and so on,the effluent water after the treatment contains high concentration of salinity,which may cause secondary pollution if discharged directly.The principle,advantages and disadvantages of desulfurized wastewater zero discharge technology were elaborated from three aspects:pretreatment technology;reduction technology and terminal treatment technology,and the process parameters were compared with those gotten from the same type of technologies.The study results provides a valuable reference for finding a more professional and efficient method of desulfurized wastewater treatment.
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