Abstract
Electrokinetic remediation is a promising technology for removal of heavy metals from soil, but its effect on arsenic remains poorly understood. Biogas slurry (10%, 25%, and 50% by mass) and sucrose (2%, 5%, and 10% by mass) were added to soil contaminated by mine drainage to enhance arsenic migration ability. Chemical sequential extraction, flame atomic absorption spectrometry, hydride generation atomic fluorescence spectrometry, and high-throughput sequencing were used to determine the iron and arsenic speciation, arsenic removal rate, and microbial community structure. Electroosmotic flow was found to play the main role in the treatment. The electroosmotic flow rate of the sucrose treatment was lower than that of the biogas slurry treatment. The sucrose could maintain a lower pH in soil compared with biogas slurry. It could also form a stronger reducing environment (redox potential, − 274 mV) and increase the abundance of iron oxide reducing bacteria. The amorphous iron oxide content increased at the end of the experiment. The removed arsenic was mainly from the residual fraction. The 25% biogas slurry and 5% sucrose treatments, could quickly remove 13.7% and 13.4% of the arsenic in one week, respectively. The highest removal rate was 14.3% in the 5% sucrose treatment at the end of the experiment and was about three times higher than the untreated control. Moreover, sucrose addition was more helpful than the biogas slurry treatment to stabilize the current and reduce energy consumption. These findings provide theoretical support to enhance microbial activity to improve this technology for removal of soil arsenic.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. U1612442 and No. 41403088) and the Foundation of Guizhou University (No. GZU [2020]72).
Funding
This study was funded by the National Natural Science Foundation of China (No. U1612442 and No. 41403088) and the Foundation of Guizhou University (No. GZU [2020]72).
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Chipeng Zhang contributed to the conception of the study and wrote the manuscript. Yaoling Hao performed the experiment and contributed to analysis. Kaixuan Zhang contributed to manuscript preparation. Shuang Chen contributed to manuscript preparation. Zeyan Yang performed the experiment.
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Zhang, C., Hao, Y., Zhang, K. et al. Effect of biogas slurry and sucrose addition on electrokinetic removal of arsenic from paddy soil. Int. J. Environ. Sci. Technol. 20, 703–714 (2023). https://doi.org/10.1007/s13762-022-04006-0
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DOI: https://doi.org/10.1007/s13762-022-04006-0