Microwave-induced steam distillation (MISD) remediation in petroleum hydrocarbon-contaminated sites: From process improvement to pilot application

The process improvement, a pilot remediation test and the decontamination mechanism of microwave-induced steam distillation (MISD) for petroleum hydrocarbons (PHs) removal were conducted. Processes of multistage steam distillation and carbon reinforcement were compared to determine the best remediat...

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Bibliographic Details
Published in:Environmental pollution (1987) 2022-11, Vol.313, p.120059-120059, Article 120059
Main Authors: Xue, Zhenkun, Zuo, Rui, Ding, Fei, Wu, Ziyi, Pan, Minghao, Cai, Weihai, Xu, Yunxiang, Wang, Jinshen
Format: Article
Language:English
Subjects:
Decontamination mechanisms
Influencing factors
Microwave heating
Oil-contaminated soil
Remediation efficiency
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Summary:The process improvement, a pilot remediation test and the decontamination mechanism of microwave-induced steam distillation (MISD) for petroleum hydrocarbons (PHs) removal were conducted. Processes of multistage steam distillation and carbon reinforcement were compared to determine the best remediation process. Pilot project was then carried out to explore the applicability of MISD in site-scale remediation. The remediation efficiency, procedures and influencing factors of site-scale MISD project were studied by monitoring variations of soil moisture, temperature and PHs concentrations. Furthermore, the decontamination mechanisms of PHs were clarified based on kinetic analysis. The results showed that the multistage steam distillation could improve 10%∼15% remediation efficiency, and the carbon reinforcement could shorten remediation duration of each steam distillation stage by 50%. Pilot MISD project adopted multistage steam distillation process and went through four (initial, rapid heating-up, gentle heating-up and quasi-equilibrium) remediation stages (overall temperature ≤100 °C). The final PHs removal rate was about 60%, which would get better with greater proportion of low boiling points components and stronger vapor extraction. Kinetic studies showed that PHs was removed by steam stripping and limited by intraparticle diffusion in the “steam distillation zone”, while local high temperature (＞100 °C) greatly improved PHs volatilization and provided activation energy for PHs desorbed and degraded in the “selective heating zone". [Display omitted] •A multistage steam distillation process improved 10%∼15% removal rate.•A carbon reinforcement process shortened 50% remediation duration.•Site-scale microwave heating project achieved over 60% pollutants removal rate.•Direct microwave irradiation and low boiling point could improve removal effect.•Steam stripping, volatilization and desorption were decontamination mechanisms.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2022.120059