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Research on a closed-loop method that enhances the electrokinetic removal of heavy metals from municipal solid waste incineration fly ashes

  • Tao HuangEmail author
  • Longfei Liu
  • Shilu Wu
  • Shuwen Zhang
Original Paper
  • 7 Downloads

Abstract

The high leachability of heavy metals and toxic organic components has severely discouraged the broader resource recycling of municipal solid waste incineration fly ashes. In this study, a recycling system combining water washing treatment, cationic buffer solution recovery, and electrokinetic remediation was designed based on pH controls and comprehensively explored in terms of strengthening the removal of heavy metals from samples and reducing the risk of environmental leaching of heavy metals in fly ashes. The water washing pretreatment removed a considerable amount of soluble minerals from the fly ash and lowered the initial pH of the electrochemical system to below 10. The dosing of buffer cations decreased the thickness of the diffuse double layer and ameliorated the mobility of the heavy metal species in the pore fluid. Cu was most sensitive to the changes in the operating factors during electrokinetics. The effects of the remediation times and voltage gradients were more significant on heavy metal removal than those of the nitric acid concentration in the electrokinetic optimization system. The leaching toxicities of zinc, lead, copper, and cadmium were reduced by 82.59%, 73.64%, 67.07%, and 93.13%, respectively. Generally, the recovery of the water washing leachate not only enhanced the performance of the electrokinetic remediation for the municipal solid waste incineration fly ash but also avoided downstream disposal of the effluent.

Keywords

Municipal solid waste incineration fly ash Heavy metals pH control Electrokinetic remediation Enhancement 

Notes

Author contributions

TH has conducted most of the experiments and analysed the corresponding results; LL has participated in the leaching experiments and improved the manuscript writing; SW has participated in the experimental design and completed the manuscript revision; SZ has participated in the experimental design and has drawn Fig. 9.

Funding

The author received no financial support from any organization for the research, authorship and/or publication of this article.

Compliance with ethical standards

Conflict of interest

The author declared no potential conflict of interest with respect to the research, authorship and/or publication of this article.

Supplementary material

11696_2019_849_MOESM1_ESM.docx (17 kb)
Supplementary material 1 (DOCX 16 kb)

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2019

Authors and Affiliations

  1. 1.School of Chemistry and Materials EngineeringChangshu Institute of TechnologyChangshuChina
  2. 2.Nuclear Resources Engineering CollegeUniversity of South ChinaHengyangChina
  3. 3.State Key Laboratory for Coal Mine Disaster Dynamics and ControlChongqing UniversityChongqingChina
  4. 4.School of Resource and Environmental ScienceChongqing UniversityChongqingChina

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