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Mechanical Treatment of MSWI Fly Ash: A Way Forward to Inhibit PCB Reformation

Category: Air Toxics

Volume: 19 | Issue: 8 | Pages: 1775-1784
DOI: 10.4209/aaqr.2019.04.0213
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Ishrat Mubeen1,2, Xiaoqing Lin 1, Zhiliang Chen1, Alfons Buekens1,3, Mi Yan2, Shengyong Lu1, Dwi Hantoko2, Xiaodong Li1, Jianhua Yan1

  • 1 State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Zhejiang 310027, China
  • 2 Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310013, China
  • 3 Formerly: Chemical Engineering Department, Vrije Universiteit Brussel, 1050 Brussels, Belgium

Highlights

  • ∑PCB, ∑dl-PCB and corresponding ∑I-TEQ concentrations were greatly reduced.
  • Homologue and isomer signatures show variable pattern after MC.
  • Mechanical treatment inhibits reformation of PCB isomers to a large extent.

Abstract

Fly ash from municipal solid waste incinerators has been classified as hazardous waste due to the presence of unintentionally-produced Persistent Organic Pollutants (POPs), with Polychlorinated biphenyls (PCB) being a major group among such POPs. Fly ash can be mechanically (MC) treated to destroy organic pollutants before final disposal or reuse. In this study, model fly ash (MFA) doped with 0.2% CuCl2 was artificially prepared and subjected to high intensity ball milling for 0 (original sample), 1, 2, 4, and 8 h of treatment. Furthermore, to explore PCB reformation in the MC treated fly ash, de novo tests were conducted at single reaction time, temperature, and air flow rate. It was found that the sum of PCB, dioxin like PCB, and corresponding International Toxic Equivalent concentrations (∑PCB, ∑dl-PCB and ∑I-TEQ, respectively) were greatly reduced both in gas and in solid phase of MFA after 8 h of treatment. Though chlorination degree successively decreased with prolonged milling, the homologue and isomer signatures of PCB were varied in concentration. Reformation of few isomers was also observed. Results from present study suggest that MC treatment is an effective method to control reformation of pollutants in the long term. However, few suggestions are made for further ongoing research work on MC treatment of fly ash, which are based on surprising results and experimental limitations obtained in this study.

Keywords

PCB Ball milling De novo formation Homologues Isomers Reformation


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