Cylindrical Electrolyser Enhanced Electrokinetic Remediation of Municipal Solid Waste Incineration Fly Ashes

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Huang, Tao^1 ; Zhou, Lulu^1 ; Tao, Junjun^1 ; Liu, Longfei^1

School of Chemistry and Materials Engineering, Changshu Institute of Technology, 215500, China^1

关键词: BCR sequential extraction;    Cathode and anode;    Electrical conductivity;    Electrical current;    Electrokinetic remediation;    Electrolyte solutions;    Municipal solid waste incineration fly ashes;    Voltage gradient;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012097/pdf
DOI  :  10.1088/1757-899X/301/1/012097

来源: IOP

【 摘 要 】

The paper discusses enhancement and efficiency of removing spiked heavy metal (HM) contaminants from the municipal solid waste incineration (MSWI) fly ashes in the cylindrical electrolyser device. The characterization parameters of the electrolyte solution pH, electric current, electrical conductivity, voltage gradient were discussed after the experiment. The chemical speciation of HMs was analysed between the original samples and remediated ones by BCR sequential extraction. The detoxification efficiencies of Zn, Pb, Cu and Cd in the column-uniform device were compared with that in the traditional rectangular apparatus. The pH value changed smoothly with small amplitude of oscillation in general in cathode and anode compartments except the initial break. The electrical current rapidly increased on the first day of the experiment and steadily declined after that and the electrical conductivity presented a clear rising trend. The residual partition of detoxified samples were obviously lifted which was much higher than the analysis data of the raw materials. The pH and the electrical conductivity in sample region were distributed more uniformly and the blind area was effectively eliminated in the electrolytic cells which was indirectly validated by the contrastive detoxification result of the spiked HMs between the rectangular and cylindrical devices.