Reviews and Special Topics

Research progress of zero liquid discharge pretreatment process for flue gas desulfurization wastewater from coal-fired power plants

  • LIU Jingying ,
  • JIA Yangjie ,
  • YANG Fengling ,
  • REN Lei ,
  • LI Pengfei ,
  • WANG Fei ,
  • CHENG Fangqin
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  • 1. Shanxi University,Taiyuan 030006,China
    2. Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes,State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi University,Taiyuan 030006,China
    3. Shanxi Rui En Ze Technology Co.,Ltd.,Taiyuan 030006,China
    4. Shanxi Dadi Haike Environmental Protection Technology Co.,Ltd.,Yangquan County 045000,China
    5. Shanxi International Energy Yuguang Coal Power Co.,Ltd.,Yangquan County 045000,China

Received date: 2023-04-26

  Online published: 2023-12-14

Abstract

More than 90% of coal-fired power plants use limestone-gypsum wet desulfurization process for flue gas desulfurization,and need to discharge part of the wastewater from the flue gas desulfurization system periodically to ensure the desulfurization effect.As the end wastewater of coal-fired power plants,desulfurization wastewater has the characteristics of large volume,poor quality and complex composition,and its direct discharge is extremely harmful to the environment.While the zero liquid discharge process of desulfurization wastewater can achieve the best removal effect of impurities and hardness ions in water and maximize the utilization of water resources and recycling of by-products in a graded manner,so it is necessary to treat desulfurization wastewater with zero liquid discharge.The pretreatment process is the basis of the zero liquid discharge desulfurization wastewater process,and its treatment effect has a great influence on the subsequent process.In the background of clean production and pollution reduction,this paper was started from the theory of zero liquid discharge pretreatment process for desulfurization wastewater,after comparing domestic and foreign zero liquid discharge processes and conducting research on a coal-fired power plant in Shanxi,it was found that the existing pretreatment process generally had problems such as high dosage of chemicals and high cost.Therefore,it was necessary to find an economically feasible pretreatment raw material to replace the calcium oxide in the current dual alkali process or to optimize its addition to achieve low-cost resource utilization.

Cite this article

LIU Jingying , JIA Yangjie , YANG Fengling , REN Lei , LI Pengfei , WANG Fei , CHENG Fangqin . Research progress of zero liquid discharge pretreatment process for flue gas desulfurization wastewater from coal-fired power plants[J]. Inorganic Chemicals Industry, 2023 , 55(12) : 12 -25 . DOI: 10.19964/j.issn.1006-4990.2023-0243

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