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Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation

Author

Listed:
  • Rui Chai

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Jinqing Wang

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Mingxiu Zhan

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Dingkun Yuan

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Zuohe Chi

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Hailin Gu

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Jiani Mao

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

Abstract

In response to the current problem of the high energy consumption of direct thermal desorption systems when treating soils with a high moisture content, we propose using the waste heat of the system to pre-dry soil to reduce its moisture. Taking chlorine–organic-contaminated soil as an object, an experimental study on the drying and pollutant desorption characteristics of soil in an indirect rotary dryer was carried out. The results show that the non-isothermal drying process was divided into warm-up and falling rate periods, and no constant period was observed. The higher the rotation speed, the lower the soil outlet temperature and the higher the drying tail gas temperature. Soil outlet and dry tail gas temperatures were lower for soils with a higher moisture content. Benzene and cis-1,2-dichloroethylene are easily desorbed. Therefore, the disposal of dry tail gas should be determined according to the type and concentration of soil pollutants present. The volumetric heat transfer coefficient was found to be 85–100 W m −3 °C −1 , which provides a key parameter for the size design of a rotary dryer.

Suggested Citation

  • Rui Chai & Jinqing Wang & Mingxiu Zhan & Dingkun Yuan & Zuohe Chi & Hailin Gu & Jiani Mao, 2022. "Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation," IJERPH, MDPI, vol. 19(24), pages 1-11, December.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:24:p:16607-:d:999518
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    References listed on IDEAS

    as
    1. Yuhuan Sun & Feng Guan & Weiwei Yang & Fayuan Wang, 2019. "Removal of Chromium from a Contaminated Soil Using Oxalic Acid, Citric Acid, and Hydrochloric Acid: Dynamics, Mechanisms, and Concomitant Removal of Non-Targeted Metals," IJERPH, MDPI, vol. 16(15), pages 1-14, August.
    2. Xuezhu Zhu & Xue Ni & Michael Gatheru Waigi & Juan Liu & Kai Sun & Yanzheng Gao, 2016. "Biodegradation of Mixed PAHs by PAH-Degrading Endophytic Bacteria," IJERPH, MDPI, vol. 13(8), pages 1-13, August.
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