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Characterization of Dioxins and Heavy Metals in Chelated Fly Ash

Author

Listed:
  • Shuping Pan

    (Zhejiang Ecological Environment Monitoring Center, Hangzhou 310007, China
    Zhejiang Key Laboratory of Ecological Environment Monitoring Forewarning and Quality Control, Hangzhou 310007, China)

  • Qi Yao

    (Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China)

  • Wenxiang Cai

    (Zhejiang Ecological Environment Monitoring Center, Hangzhou 310007, China
    Zhejiang Key Laboratory of Ecological Environment Monitoring Forewarning and Quality Control, Hangzhou 310007, China)

  • Yaqi Peng

    (Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China)

  • Yuhao Luo

    (Zhejiang Ecological Environment Monitoring Center, Hangzhou 310007, China)

  • Zhizhen Wang

    (Zhejiang Ecological Environment Monitoring Center, Hangzhou 310007, China)

  • Caiping Jiang

    (Zhejiang Ecological Environment Monitoring Center, Hangzhou 310007, China)

  • Xiaodong Li

    (Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China)

  • Shengyong Lu

    (Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

Municipal solid waste incineration (MSWI) fly ash contains highly toxic heavy metals and polychlorinated dibenzo dioxins/furans (PCDD/Fs), which are a type of hazardous waste. The pollution characteristics of fly ash have changed with the development of stoker grate incinerators and the fly ash treatment technology; however, no research has been focused on this in recent years. In this study, 12 fly ash samples were collected from 9 grate power plants in southeastern China, and their PCDD/Fs and heavy metal concentrations were determined and compared to previous fly ash data. The PCDD/Fs concentration in fly ash was in the range of 0.002–0.051 ngI-TEQ/g, with an average of 0.027 ngI-TEQ/g. Furthermore, 1,2,3,4,6,7,8-HpCDD and OCDD made the most significant contributions to PCDDs. The distribution of 10 dioxins exhibited bimodal, unimodal, and normal characteristics. Linear fitting demonstrated a strong correlation between toxicity and 1,2,3,7,8-PentaCDD, 1,2,3,7,8-PentaCDF, and 2,3,4,7,8-PentaCDF. Concerning heavy metals, Pb poses a significant environmental risk. This is the first time that fly ash treated with a chelating agent has been thoroughly analyzed, which is vital for understanding the pollution level and treatment of fly ash derived from current power plants.

Suggested Citation

  • Shuping Pan & Qi Yao & Wenxiang Cai & Yaqi Peng & Yuhao Luo & Zhizhen Wang & Caiping Jiang & Xiaodong Li & Shengyong Lu, 2022. "Characterization of Dioxins and Heavy Metals in Chelated Fly Ash," Energies, MDPI, vol. 15(13), pages 1-10, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4868-:d:854462
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