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Application of submerged ultrafiltration in Pretreatment of Flue Gas Desulfurization Wastewater

Energy Engineering 2022年第6期119卷 2277-2296页

作者： Jiageng Zhang Zhengfeng Wang Jiguang Huang Chao Cheng Heng Zhang Dan Gao School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China Hebei Construction&Investment Group Xuanhua Thermal Power Co. Ltd.Zhangjiakou075100China

Nowadays,the zero liquid discharge of flue gas desulfurization(FGD)wastewater from coal-fired units has attracted the attention of all countries in the *** pretreatment methods generally have the problems of high operation cost,small treatment capacity,and poor ***,the membrane method can avoid the above *** the current research,it has not been found that someone directly uses submerged ultrafiltration to pretreat FGD ***,this paper innovatively proposed to directly use ceramic ultrafiltration membrane to treat FGD wastewater,which can ensure effluent quality and improve the flexibility of the pretreatment *** this paper,the performance of submerged ultrafiltration membrane for the filtration of FGD wastewater from a power plant was studied to optimize the filtration performance and improve the effluent *** effects of operating parameters such as membrane permeate flux,aeration rate and filtration/backwashing time combination on the membrane performance were *** results showed that when the filtration/backwashing time combination was 15 min/30 s,with the increased in permeate flux from 55 L/(m2·h)to 100 L/(m2·h),the steady transmembrane pressure(TMP)increased from 39 kPa to 70 kPa,and the fouling rate increased significantly from 4.5 kPa/h to 7.3 kPa/h;When the aeration rate increased from 10 m3/(m2·h)to 30 m3/(m2·h),the membrane pollution was much *** aeration rate cannot further alleviate the membrane pollution,but also brought greater energy consumption;Increasing backwashing time can effectively inhibit the formation of gel layer on the surface of the membrane and prolong the initial stage of low-pressure operation;The rejection of suspended solids(SS)and turbidity of the equipment studied in this paper can reach more than 99%under various working conditions,which can satisfy the water quality requirements of the subsequent *** submerged ultrafiltration membrane was suitable

关键词： FGD wastewater pretreatment submerged ultrafiltration permeate flux aeration rate backwashing membrane fouling

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