Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (3): 200-206.DOI: 10.13745/j.esf.sf.2022.1.42

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Application and energy efficiency analysis of in-situ thermal remediation technology for contaminated sites

ZHANG Xiaogang1(), ZHANG Fang1, LI Shupeng1,2, WEI Yunxiao2, HOU Deyi1, LI Guanghe1,*()   

  1. 1. School of Environment, Tsinghua University, Beijing 100084, China
    2. Beijing Construction Engineering Environmental Remediation Co., Ltd., Beijing 100015, China
  • Received:2021-12-21 Revised:2022-01-27 Online:2022-05-25 Published:2022-04-28
  • Contact: LI Guanghe


To address the difficulties associated with the effectiveness and efficiency assessments of in-situ thermal remediation (ISTR) technology, this study analyzed and revealed the principals of heat transfer and pollutant removal, the key influencing factors such as thermal conductivity and electrical conductivity, and the energy efficiency of ISTR. Based on the pilot-scale implementation of in-situ electrical resistance heating (ERH) remediation technology at a contaminated site, heating performance of the ERH system and the spatio-temporal distribution of the temperature field were analyzed. Further, the causes of spatial variation of temperature were investigated. According to the analysis, the site was heated primarily via electrical resistance heating and thermal conduction by the electrode well. The heating efficiency was affected by the electrode well distance and site lithological characteristics. Heat loss to the surface and around is a key factor for future energy efficiency assessment of ISTR technology.

Key words: contaminated sites, in-situ thermal remediation, electrical resistance heating, temperature distribution, assessment of energy efficiency

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