EXPERIMENTAL STUDY ON MICROWAVE DESORPTION OF SOIL CONTAMINATED BY INSULATING OIL

CHE Kai; HAN Zhongge; YU Jinxing; CHEN Chongming; LIU Songtao; GU Xingjia

doi:10.13205/j.hjgc.202202020

Volume 40 Issue 2

Apr. 2022

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CHE Kai, HAN Zhongge, YU Jinxing, CHEN Chongming, LIU Songtao, GU Xingjia. EXPERIMENTAL STUDY ON MICROWAVE DESORPTION OF SOIL CONTAMINATED BY INSULATING OIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(2): 127-131,138. doi: 10.13205/j.hjgc.202202020

Citation:

CHE Kai, HAN Zhongge, YU Jinxing, CHEN Chongming, LIU Songtao, GU Xingjia. EXPERIMENTAL STUDY ON MICROWAVE DESORPTION OF SOIL CONTAMINATED BY INSULATING OIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(2): 127-131,138. doi: 10.13205/j.hjgc.202202020

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EXPERIMENTAL STUDY ON MICROWAVE DESORPTION OF SOIL CONTAMINATED BY INSULATING OIL

doi: 10.13205/j.hjgc.202202020

1. State Grid Hebei Electric Power Research Institute, Shijiazhuang 050021, China;
2. School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China

Received Date: 2021-03-17
Available Online: 2022-04-02
Publish Date: 2022-04-02

Abstract

Abstract

Microwave-thermogravimetric reaction device was used to conduct microwave thermal desorption test for insulating oil contaminated soil. The desorption efficiency of insulating oil and the weightlessness rule of contaminated soil were investigated at different temperatures. Based on this, the composition and distribution of residual insulating oil in soil were analyzed. The results showed that when the temperature was above 400 ℃, the removal efficiency of insulating oil in soil was better, and the removal rate of insulating oil could reach 98.6%, which met the requirements of soil remediation. With the increase of temperature, the oil-bearing soil mainly experienced the stages of moisture volatilization, volatile organic compounds and volatile organic compounds. At the stage of 100~200 ℃, moisture and some low volatile organic compounds in the soil were mainly precipitated. At the stage of 400~500 ℃, the insulating oil in the soil was mainly precipitated. The main components of insulating oil in soil were C12—C21 alkanes and 5~6 cyclic aromatic hydrocarbons. When the temperature reached 400 ℃, each component of insulating oil was gradually desorbed completely. Considering the principles of desorption efficiency and economy, the appropriate desorption temperature for insulating oil contaminated soil was between 400 ℃ and 450 ℃.
- insulating oil,
- soil,
- microwave desorption,
- weightlessness

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References(26)

References

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