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Study on the effects of alcohol-enhanced air sparging remediation in a benzene-contaminated aquifer: a new insight

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Abstract

In this study, the effects of medium carbon chain alcohol (1-heptanol)-enhanced air sparging (AS) on the remediation of benzene-contaminated aquifers in different media (medium sand, channelized flow; gravel, bubbly flow) were investigated by comparison with a commonly used surfactant (sodium dodecylbenzene sulfonate (SDBS)). The results showed that the addition of 1-heptanol and SDBS significantly increased the air saturation in AS process under different airflow modes. Combined with water retention curves, 1-heptanol had the same effect on reducing the surface tension of groundwater and stabilizing bubbles as SDBS. In the study of benzene pollution removal, when the removal efficiency of the benzene pollutant exceeded 95%, the time required for surfactant-enhanced AS (SEAS) and alcohol-enhanced AS (AEAS) in medium sand was shortened by 28.6% and 52.4%, respectively, and the time required for SEAS and AEAS in gravel media was shortened by 16.7% and 58.3%, respectively, compared with the time required for AS. This finding indicated that the addition of SDBS or 1-heptanol could significantly increase the removal rate of benzene pollutants. Under the same surface tension conditions, the removal effect of 1-heptanol on the benzene pollutant was better than that of SDBS. This difference was due to the disturbance of the flow field during AEAS process causing the 1-heptanol on the gas-liquid interface to volatilize in the carrying gas, thereby inducing Marangoni convection on the interface, enhancing the gas-liquid mass transfer rate, and increasing the removal rate of benzene on the interface. Therefore, 1-heptanol is promising as a new reagent to enhance AS to remediate groundwater pollution.

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Funding

The study was financially supported by the Key Project of National Natural Science Foundation of China (Grant No. 41530636). We are extremely grateful to Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China.

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Authors and Affiliations

  1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China

    Yuehua Chang, Meng Yao, Jing Bai & Yongsheng Zhao

  2. Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun, 130021, China

    Yuehua Chang, Meng Yao, Jing Bai & Yongsheng Zhao

  3. State-Local joint engineering lab for control and remediation technologies of petrochemical contaminated site, Jilin University, Changchun, 130021, China

    Yuehua Chang, Meng Yao, Jing Bai & Yongsheng Zhao

Authors
  1. Yuehua Chang
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  2. Meng Yao
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  3. Jing Bai
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  4. Yongsheng Zhao
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Correspondence to Yongsheng Zhao.

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Chang, Y., Yao, M., Bai, J. et al. Study on the effects of alcohol-enhanced air sparging remediation in a benzene-contaminated aquifer: a new insight. Environ Sci Pollut Res 26, 35140–35150 (2019). https://doi.org/10.1007/s11356-019-06527-7

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