BES驱动电渗析对飞灰中Pb和Ni的影响  

Removal of Pb and Ni from Fly Ash Using Electrodialysis Driven by a Bio-electrochemical System

作　　者：查甫更[1,2] 乐思奇 王少海 齐文锦 薛璇璇 王兴明[1,2] 张世文[1,2] 胡友彪[1,2] ZHA Fugeng;YUE Siqi;WANG Shaohai;QI Wenjin;XUE Xuanxuan;WANG Xingming;ZHANG Shiwen;HU Youbiao(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Anhui Engineering Laboratory for Comprehensive Utilization of Water and Soil Resources and Ecological Protection in Mining Area with High Groundwater Level,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]安徽理工大学安徽省高潜水位矿区水土资源综合利用与生态保护工程实验室,安徽淮南232001

出　　处：《环境科学与技术》2023年第7期216-221,共6页Environmental Science & Technology

基　　金：国家自然科学基金资助项目(51608006,51878004);国家重点研发计划(2020YEC1908601);安徽理工大学研究生创新基金(2022CX2001)。

摘　　要：该文构建生物电化学系统(BES)驱动电渗析装置处理飞灰,采用正交试验考察不同外加电压、初始pH和液固比对飞灰中Pb、Ni的迁移效果及残留飞灰中重金属形态分布和浸出毒性的影响。结果表明:电渗析过程中反应池内Pb、Ni浓度受初始pH和液固比控制,阴/阳极液中Pb、Ni浓度先无明显变化后上升,3 d后增速变缓;电渗析处理14 d后Pb、Ni分布特征为飞灰浸出液>离子交换膜>阴/阳极液≈阴/阳极,飞灰中Pb和Ni主要向阴极端迁移,在外加电压、初始pH和液固比为300 mV、3、20 mL/g和300 mV、4、50 mL/g时获得最高去除率分别为25.43%和77.48%;残留飞灰中Pb和Ni的弱酸可提取态分别降低了9.97%~15.76%和6.94%~25.11%,残渣态分别增加了4.88%~38.25%和16.44%~38.24%,浸出毒性均低于GB 5085.3-2007限值。Electrodialysis driven by a bio-electrochemical system(BES)was used to treat fly ash.The influences of additional voltage,initial pH and liquid-solid ratio on migration,speciation and leaching toxicity of Pb and Ni were investigated by orthogonal tests.The result showed that the concentrations of Pb and Ni from fly ash at the reaction were controlled by the initial pH and liquid-solid ratio,while the variation of Pb and Ni at the catholyte/anolyte was changeless at first and then increased,and the accelerated rate slowed down after 3 d.After 14 days treatment of electrodialysis,the distribution of Pb and Ni were ash leachate>ion exchange membrane>catholyte/anolyte≈cathode/anode.Pb and Ni mainly migrated to the cathode side,and the highest removal rates were 25.43%and 77.48%when the additional voltage,initial pH and liquid-solid ratio were 300 mV,3,20 mL/g and 300 mV,4,50 mL/g,respectively.The acid soluble fraction of Pb and Ni in residual ash was reduced by 9.97%~15.76%and 6.94%~25.11%,while residual fraction increased by 4.88%~38.25%and 16.44%~38.24%respectively.The leaching toxicity of residual ash was lower than the limit value of GB 5085.3-2007.

关 键 词：飞灰 电渗析 重金属去除 生物电化学系统 

分 类 号：X705[环境科学与工程—环境工程]