Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1431-1437.doi: 10.13278/j.cnki.jjuese.20180047

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Migration Characteristics of Steam and Its Remediation to Chlorobenzene Contaminated Soil

Zhao Yongsheng1,2, Yang Yuanyuan1,2, Gao Penglong3, Kang Xuehe1,2, Wang Haoying1,2, Chang Yuehua1,2   

  1. 1. Key Lab of Groundwater Resources and Environment(Jilin University), Ministry of Education, Changchun 130021, China;
    2. College of New Energy and Environment, Jilin University, Changchun 130021, China;
    3. The National Energy Investment Group, Ordos 017200, Inner Mongolia, China
  • Received:2018-03-08 Online:2019-09-26 Published:2019-10-10
  • Supported by:
    Supported by National Natural Science Foundation of China (41530636) and Graduate Student Innovation Fund Project (2017146)

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Abstract: Steam injection is a newly developed and promising soil remediation technology for non-aqueous phase liquids (NAPLs) in a vadose zone. In order to investigate the migration characteristics of hot steam in unsaturated porous media and evaluate the effectiveness of steam injection for remediation of chlorobenzene contaminated soil, the authors carried out a steam migration experiment in porous media and steam injection remediation experiment of chlorobenzene through one-dimensional simulated column. The results indicated that the temperature of the given point in the simulated column can be divided into three stages, namely, the environment temperature stage, the heating stage, and the saturated steam temperature stage. The migration velocity of temperature front decreased with distance. The pressure was distributed in the steam-occupied region, and the spatial distribution was linear, and the pressure showed an increase first and then tended to balance over time in a given location. At the end of the experiment, the water saturation measured gradually increased with the migration distance of the steam. The steam injection flow rate was 0.3 kg/h and initial mass fraction of chlorobenzene was 56.8 mg/kg. The removal rate of chlorobenzene in fine sand by hot steam was 98% after 3.5 h. Outflow was produced at the bottom of the simulated column due to the saturation of steam condensate water. The mass concentration of chlorobenzene in the effluent reached the maximum of 152.98 mg/L after 10 min of outflow; while the concentration of chlorobenzene in the effluent was less than 7 mg/L after 70 min. The concentration of chlorobenzene in the medium increased with the distance, maximum residual amount is 0.36 mg/kg. This result shows that steam injection can effectively improve the smearing in contrast to soil vapor extraction.

Key words: steam injection, vadose zone, transport, chlorobenzene

CLC Number: 

  • X53
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