Landfill leachate is a complex effluent and it is difficult to deal with.Electrochemical meth-ods have been considered as a promising alternative technology for treatment of landfill leachate with refractory organic contaminants and heavy metals.Peroxi-coagulation(PC)process with iron anode and modified graphite felt cathode was developed for efficient land-fill leachate concentrate treatment.Compared to electro-Fenton(EF)and electrocoagulation(EC)processes,the PC process was more cost-effective due to the combined action of `OH oxidation and iron hydroxides coagulation.A maximal TOC removal of 77.2％±1.4％was obtained after 360 min at initial pH=5.0 and current density of 10 mA/cm2.After the PC process,concentrations of all seven heavy metals in the final effluents were below the al-lowable emission limits given by the present regulatory standards.The method preference for heavy metal removal was PC＞EC＞EF.Based on the three-dimensional fluorescence spectroscopy coupled with regional integration analysis during the PC treatment,the flo-rescence peaks of both humic acids and fulvic acids disappeared after treatment for 360 min.Decreasing trends were observed in the fluorescent regional standard volumes for aro-matic protein I(31.4％),aromatic protein Ⅱ(63.7％),fulvic acid-like(69.5％),soluble microbial by-product-like(75％)and humic acid-like regions(76.3％).The results indicate that compar-ing to the EF and EC process,the PC process provide a promising and more cost-effective alternative for the treatment of landfill leachate concentrate.

Dun Liu;Ying Yuan;Yuquan Wei;Hao Zhang;Yanxiao Si;Fang Zhang

School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control,Tsinghua University,Beijing 100084,China;Beijing Advanced Innovation Center for Big Data-based Precision Medicine,Beihang University,Beijing 100191,China

环境科学学报（英文版）

[1]Dun Liu;Ying Yuan;Yuquan Wei;Hao Zhang;Yanxiao Si;Fang Zhang-.Removal of refractory organics and heavy metals in landfill leachate concentrate by peroxi-coagulation process)[J].环境科学学报（英文版）,2022(06):43-51

Landfill,Peroxi,lowable,flo

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