School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
J Hazard Mater. 2018 Jan 15;342:107-113. doi: 10.1016/j.jhazmat.2017.08.023. Epub 2017 Aug 12.
In this study, we demonstrated the feasibility of an integrated remediation approach for simultaneous immobilization of Pb in both soil and groundwater. The laboratory test was conducted via column experiment by pumping Pb-contaminated groundwater into the pre-amended contaminated surface soils to identify their retention and immobilization ability of Pb. HYDRUS modeling was undertaken to simulate Pb distribution and permissible treatment capacity in the remediation. The experiment results showed that phosphate- and biochar-amended soils were highly effective in removing Pb from contaminated groundwater, with the removal reaching up to 94.2% and 84.5%, respectively. However, phosphate amendment was more effective in immobilizing Pb with TCLP extracted Pb reduced by 18.3%-51.5%, compared to the control, while the reduction for biochar amendment was less than 13.5%. The modeling indicated that phosphate-amended soil could immobilize 509gPbm soil under the environmentally-relevant conditions, given both groundwater and soil quality criteria being met. Our study demonstrated that the integrated system with phosphate amendment is fairly feasible for simultaneous remediation of both Pb-contaminated soil and groundwater.
在本研究中，我们展示了一种综合修复方法的可行性，该方法可同时固定土壤和地下水中的 Pb。通过将受 Pb 污染的地下水抽入预先添加的受污染表层土壤中的柱实验进行实验室测试，以确定它们对 Pb 的保留和固定能力。采用 HYDRUS 模型模拟修复过程中 Pb 的分布和允许的处理能力。实验结果表明，磷酸盐和生物炭改良土壤对去除污染地下水中的 Pb 非常有效，去除率分别高达 94.2%和 84.5%。然而，磷酸盐改良剂在固定 Pb 方面更有效，TCLP 提取的 Pb 减少了 18.3%-51.5%，而对照条件下生物炭改良剂的减少量小于 13.5%。建模表明，在满足地下水和土壤质量标准的情况下，磷酸盐改良土壤在环境相关条件下可固定 509gPbm 土壤中的 Pb。我们的研究表明，磷酸盐改良剂的综合系统对于同时修复受 Pb 污染的土壤和地下水是相当可行的。
