利用有效微生物作为新型电解质在电动修复应用中去除污染土壤中高浓度镉的潜在机制。
Potential mechanisms contributing to the high cadmium removal efficiency from contaminated soil by using effective microorganisms as novel electrolyte in electrokinetic remediation applications.
机构信息
Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan Dist., New Taipei City, 24301, Taiwan, ROC; Center for Environmental Sustainability and Human Health, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan Dist., New Taipei City, 24301, Taiwan, ROC.
Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan Dist., New Taipei City, 24301, Taiwan, ROC.
出版信息
Environ Res. 2022 Dec;215(Pt 3):114239. doi: 10.1016/j.envres.2022.114239. Epub 2022 Sep 20.
In this study, we tested the ability of a solution of effective microorganisms (EM) to remove cadmium from soil. Experimental results revealed that EM had an overall cadmium removal efficiency of 90.5% after 7 days of electrokinetic (EK) treatment. During EK treatment, EM exhibited a low initial pH of 3.6 and a high conductivity of 7.0 mS/m; therefore, they reduced the pH of the anode after an electric field was applied. EM had a surface tension of 50.3 dyne/cm and exhibited biosurfactant property in the EK experiments. The cadmium removal efficiency of EM in soil was compared with that of tap water, citric acid, and ethylenediaminetetraacetic acid (EDTA). The results revealed that after 7 days of EK treatment, EM had a higher cadmium removal efficiency than did citric acid (72.3%), EDTA (75.4%), and tap water (21.7%). This result can be partly attributed to the biosurfactant property of EM, which enables them to penetrate deeply into the soil matrix and thus dissolve a high quantity of pollutants. Overall, the results of this study indicate that EM can serve as an economic and efficient biosurfactant for removing cadmium from soil in EK applications.
在这项研究中，我们测试了有效微生物（EM）溶液去除土壤中镉的能力。实验结果表明，在 7 天的电动（EK）处理后，EM 的总体镉去除效率为 90.5%。在 EK 处理过程中，EM 表现出低初始 pH 值 3.6 和高电导率 7.0 mS/m；因此，它们在施加电场后降低了阳极的 pH 值。EM 的表面张力为 50.3 达因/厘米，并在 EK 实验中表现出生物表面活性剂特性。EM 在土壤中的镉去除效率与自来水、柠檬酸和乙二胺四乙酸（EDTA）进行了比较。结果表明，在 7 天的 EK 处理后，EM 的镉去除效率高于柠檬酸（72.3%）、EDTA（75.4%）和自来水（21.7%）。这一结果部分归因于 EM 的生物表面活性剂特性，使它们能够深入土壤基质并溶解大量污染物。总体而言，这项研究的结果表明，EM 可以作为一种经济高效的生物表面活性剂，用于 EK 应用中从土壤中去除镉。
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