摘要
采用流动电极代替传统的固定电极电吸附水中离子,即流动电极电吸附技术,以解决传统电吸附技术的吸附效率衰减和电极再生难等问题。结果表明:流动电极浆体的搅拌可提高电吸附出水电导率的稳定性,搅拌有助于改善流动电极浆体的均匀性及离子脱附率;电压的增加极大极高电吸附的去除率,当电压为1.5 V时,电吸附Na2SO4的去除率达到14.3%;当Na2SO4溶液流速由5 m L·min^(-1)降为2 m L·min^(-1)时,电吸附Na2SO4的去除率增加了11%,但流动电极的流速影响较小;流动电极中吸附的盐分浓缩度可达到11倍以上,降低了电吸附过程中浓水量,增加了得水率。相比于固定电极电吸附,流动电极电吸附在处理重金属Fe3+和结垢离子Ca^(2+)等均可实现稳定的吸附-脱附循环。
The flow-electrode was used to replace the traditional fixed electrode for ions adsorption from water,which can solve the problems of the adsorption efficiency attenuation and difficulty for electrode regeneration of the traditional electro-adsorption.The results showed that the stirring of the flow-electrode slurry greatly increased the stability of the effluent water conductivity,and improved the uniformity of the slurry and the desorption rate of the ions.With the increase of voltage,the removal rate by the electro-adsorption was extremely enhanced.When the voltage was 1.5 V,the removal rate by the electro-adsorption of Na2SO4 solution reached 14.3%.When the flow rate of Na2SO4 solution decreased from 5 m L·min^(-1)to 2 m L·min^(-1),the removal rate by the electro-adsorption of Na2SO4 solution increased by 11%.However,the flow rate of the flow electrode had a slight effect on the removal rate of Na2SO4 solution.Over 11 times of the salt concentration adsorbed in the flow-electrode slurry occurred,the concentrated water amount decreased and the purified water yield increased.Compared with the fixed electrode,a stable adsorption-desorption cycle can be achieved when treating heavy metal of Fe3+or scaling ion of Ca^(2+)using the flow-electrode capacitive deionization.
作者
高新源
李爱民
刘佩春
刘玉斌
宋海鸥
李阳
战树岩
GAO Xinyuan;LI Aimin;LIU Peichun;LIU Yubin;SONG Haiou;LI Yang;ZHAN Shuyan(School of the Environment,Nanjing University,Nanjing 210023,China;Win Future Environmental Protection Tech.Co.Ltd.,Tianjin 300300,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2021年第4期1252-1259,共8页
Chinese Journal of Environmental Engineering
基金
天津万峰环保科技有限公司电吸附除盐机理以及工程应用研究项目(WF-YFZX-YFLX-2018-3)。
关键词
流动电极
电吸附
除盐
搅拌
浓缩度
flow-electrode
electro-adsorption
desalting
stirring
concentration degree
