Abstract
Landfill leachate–contaminated soil is widespread all over the world. In order to study the removal of mixed contaminants from landfill leachate–contaminated soil by flushing with bio-surfactant, soil column test was conducted to select an optimum concentration of bio-surfactant saponin (SAP) at first. Then, the removal efficiencies of organic contaminants, ammonia nitrogen, and heavy metals from landfill leachate–contaminated soil by flushing with SAP were studied. At last, the toxicity of contaminated soil before and after flushing was estimated by sequential extraction of heavy metals and plant growth test. The test results showed that the SAP solution with the concentration of 2.5 CMC could effectively remove the mixed contaminants from soil and would not introduce excessive pollutants of SAP in soil. Specifically, the removal efficiencies of organic contaminant and ammonia nitrogen were 47.01% and 90.42%, respectively. And the removal efficiencies of Cu, Zn, and Cd were 29.42%, 22.55%, and 17.68%, respectively. During flushing, hydrophobic organic compounds as well as physisorption and ion-exchange ammonia nitrogen in soil were removed by the solubilization effect of SAP, and heavy metals were removed by the chelation of SAP. After flushing with SAP, the reduced partition index (IR) value of Cu and Cd increased, and the mobility index (MF) value of Cu decreased. In addition, flushing with SAP reduced the plant toxicity of contaminated soil, and the residual SAP in soil promoted the plant growth. Therefore, flushing with SAP offered great potentials in remediating the landfill leachate–contaminated soil.
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Funding
This research was financially supported by the National Natural Science Foundation of China (No. 41877240), National Key Research and Development Program of China (No. 2018YFC1802300), and Scientific Research Foundation of Graduate School of Southeast University (No. YBPY2154).
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Mei Bai: conceptualization, methodology, validation, writing—original draft. Zhibin Liu: conceptualization, writing—review and editing, supervision, project administration. Zhu Liu: investigation, visualization. Haitao Yu: project administration. Liangliang Lu: resources.
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Bai, M., Liu, Z., Liu, Z. et al. Removal of mixed contaminants from landfill leachate–contaminated soil by flushing with bio-surfactant: laboratory column tests. Environ Sci Pollut Res 30, 53702–53711 (2023). https://doi.org/10.1007/s11356-023-26094-2
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DOI: https://doi.org/10.1007/s11356-023-26094-2