How to Treat Desulfurization Wastewater from Coal-fired Power Plants
The source of desulfurization wastewater from coal-fired power plants is typically sulfur dioxide emissions from the combustion of coal.
Wastewater Characteristics
The characteristics of desulfurization wastewater from coal-fired power plants include high sulfur content, high alkalinity, and high concentrations of heavy metals.
Most desulfurization devices in power plants adopt the flue gas limestone-gypsum wet desulfurization process. The process is mainly composed of limestone slurry preparation system, gypsum dehydration system and desulfurization wastewater treatment system. In the process of continuous circulation, the water in the slurry of the desulfurization unit will be enriched with heavy metal elements and Cl -, which will accelerate the corrosion of the desulfurization equipment on the one hand, and affect the quality of gypsum on the other hand, so it is necessary to discharge the wastewater in time.
How to Treat
The treatment process for desulfurization wastewater from power plants typically involves chemical precipitation, coagulation, flocculation, sedimentation, filtration, and activated carbon adsorption.
Process flow of desulfurization wastewater treatment in power plant: Desulfurization Wastewater → Wastewater Tank → Wastewater Pump → PH Neutralization Tank → Settling Tank → Flocculation Tank → Clarifier → Outlet Tank → Outlet Pump → Discharge up to standard
Desulfurization wastewater treatment system includes Wastewater Treatment, Chemical Dosing and Sludge Treatment. The wastewater treatment system is mainly composed of waste water tank, triple header, clarifier, sludge pump, water outlet tank, clean water pump, fan, dehydrator and other parts of equipment. In addition to a large amount of Cl - and Mg2+, impurities in desulfurization wastewater also include fluoride, nitrite, etc; Heavy metal ions, such as Cu2+, Hg2+, etc; Insoluble CaSO4 and fine dust. In order to meet the wastewater discharge standards, corresponding wastewater treatment devices shall be equipped.
Sludge Treatment
Chemical pretreatment of wastewater, sludge and all organic matters is usually required for the treatment of desulfurization wastewater and sludge in power plants to effectively reduce the activity of pollutants. Then, physical treatment methods including filtration, dehydration, drying and so on are used to further treat the sludge into disposable products to meet the requirements of emission standards.
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