Environmental Science Research Institute, School of Environmental Science and Engineering, Huazhong Univ. of Science and Technology, Wuhan, 430074, PR China.
Institute of Eco-environment and Soil-remediation, Guangdong Provincial Academy of Environmental Science, Guangzhou, 510045, PR China.
J Environ Qual. 2020 Mar;49(2):358-367. doi: 10.1002/jeq2.20057. Epub 2020 Mar 4.
In this work, the use of a coupled process, alkyl glycoside (APG) enhanced soil desorption followed by the zero-valent iron-ethylenediaminetetraacetic acid (EDTA)-air (ZEA) Fenton-like system, was investigated for the remediation of a simulated hexachlorobenzene (HCB)-contaminated diatomite soil and a real HCB-contaminated soil. Three surfactants with different concentrations were studied to obtain the suitable soil desorption agent. Compared with APG0810 and Triton x-100, APG0814 showed a better solubilization effect due to its lower critical micelle concentration. With addition of 3000 mg L APG0814, 35% of HCB was removed from contaminated diatomite soil, and a small amount of residual APG in diatomite soil was found to be beneficial for the soil dispersion. After treatment with the ZEA system, the removal efficiency of HCB in the diatomite soil desorption solution reached 76% in 2 h; we observed that a small amount of APG retained in the desorption solution accelerated the HCB removal. A real HCB-contaminated soil was used to verify the remediation effects. This study demonstrates that our approach is a feasible alternative for remediating soil contaminated with hydrophobic organic compounds.
在这项工作中，研究了一种耦合过程，即用烷基糖苷（APG）增强土壤解吸，然后再用零价铁-乙二胺四乙酸（EDTA）-空气（ZEA）类芬顿系统，以修复模拟的六氯苯（HCB）污染的硅藻土土壤和实际的 HCB 污染土壤。研究了三种不同浓度的表面活性剂，以获得合适的土壤解吸剂。与 APG0810 和 Triton x-100 相比，APG0814 由于其较低的临界胶束浓度而表现出更好的增溶效果。添加 3000mg/L 的 APG0814 后，从污染的硅藻土土壤中去除了 35%的 HCB，并且发现硅藻土土壤中少量残留的 APG 有利于土壤分散。在用 ZEA 系统处理后，硅藻土土壤解吸溶液中 HCB 的去除效率在 2 小时内达到 76%；我们观察到解吸溶液中保留的少量 APG 加速了 HCB 的去除。还使用实际的 HCB 污染土壤来验证修复效果。这项研究表明，我们的方法是修复疏水性有机化合物污染土壤的可行替代方法。
