Remediation of heavily PAHs-contaminated soil with high mineral content from a coking plant using surfactant-enhanced soil washing

环境化学 环境修复 化学 修正案 土壤污染 肺表面活性物质 生物利用度 污染 土壤水分 环境科学 土壤科学 生物信息学 生物 生物化学 法学 生态学 政治学
作者
Meng Zhang,Weixiao Chen,Xiuyun Chuan,Xiaoying Guo,Xiaofang Shen,Haiyun Zhang,Fan Wu,Jing Hu,Zhipeng Wu,Bin Wang
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:909: 168499-168499 被引量:16
标识
DOI:10.1016/j.scitotenv.2023.168499
摘要

This study investigated the effectiveness of various surfactants at different concentrations in removing high concentrations of polycyclic aromatic hydrocarbons (PAHs) from soil with high mineral content, focusing on the impact of surfactant treatment on the mobility of the residual PAHs in soil. The results revealed that the cationic surfactant (CTMAB) inhibited removal of PAHs in the whole tested concentration range of 0.1-8 g/L. In contrast, the non-ionic and anionic surfactants (Triton X-100 and SDBS) significantly enhanced removal of PAHs as their amendment concentrations reached 2 g/L and above. Triton X-100 exhibited steadily increased efficacy with increasing amendment concentrations and maintained favorable solubilization capability when continuously amended, making it the preferable choice for remediating PAHs-contaminated soil. Surfactant and water washing processes altered soil physicochemical properties by removing some clay minerals (e.g., faujasite) and organic matter that can bind or sequester PAHs, potentially increasing their extractability and bioavailability in the washed soil, thereby posing higher ecological risks compared to the original one. Although soil washing decreased retention of the remaining PAHs in soil, it did not significantly impact PAHs release from soil by flowing water. These findings provide insights into the long-term effectiveness and ecological impacts of surfactant-enhanced washing as a potential remediation technique for PAHs-contaminated soil.
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