Treatment progress and standard modification suggestion for FGD wastewater from coal-fire power plants in China

Ma Shuangchen; Wen Jiaqi; Wan Zhongcheng; Wu Kai; Chai Jin; Zhang Jingrui; Liu Qibin

doi:10.13226/j.issn.1006-6772.2017.04.003

Abstract：At present,nearly 70 percent of domestic and foreign coal-fired power plants choose limestone-gypsum wet flue gas desulfurization as flue gas desulfurization(FGD) method,the desulfurization waste water produced by FGD has a complex composition and is difficult to dispose,so that makes it a current electric power environmental problem.Meanwhile,with the national environmental protection laws and regulations are becoming more stringent,waste water zero discharge technology will be complied into the technical specifications.As a huge water consumption unit,the effluent water quality and quantity of boiler system,water circulating system and environmental protection system in coal-fired power plants still need to be further studied.And considering the imperfection of existing waste water treatment technologies,it is recommended to revise the existing standard with the capability of waste water treatment by now.For example,drawing lessons from mature pollutants discharge standards of foreign developed countries,like transferring the focus from concentration control to total amount control.Treatment progresses for FGD waste water from coal-fired power plants,FGD waste water quality characteristics and source were summarized;and the domestic municipal sewage and industrial waste water discharge control standards and focal problems in the standard-setting process were concluded.In the very end,it is proposed that the total dissolved solids TDS (especially chloride ion),heavy metal ion pollution control level should be increased.Therefore,coal-fired power plants FGD waste water emission standard (2006 edition) of power industry needs to keep its pace and respond positively to the national "Thirteen-Five" plans to promote and restrain the policy regulations in waste water zero-emission technology,and gradually improve the water environment in China.