Department of Environmental Engineering and Management, Chaoyang University of Technology, Wufong 41349, Taiwan.
Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan.
J Hazard Mater. 2019 Apr 15;368:894-898. doi: 10.1016/j.jhazmat.2018.08.085. Epub 2018 Aug 28.
Some agricultural lands have been contaminated by heavy metals in Taiwan for several decades, because the irrigation system was polluted by wastewater. In this study, a circulation-enhanced electrokinetics (CEEK) and phytoremediation were applied alternately to the real lead-contaminated site. In the beginning, the CEEK was used; then, the corn plants were raised. After this phytoremediation, the CEEK was employed again. Experimental results show that the lead concentration can be reduced from 5672 mg/kg to 2083 mg/kg (around 63%) after the three-stage treatment (CEEK + corn + CEEK). At each stage, CEEK, corn plants, and CEEK can remove around 25%, 5%, and 30% lead from the soil, respectively. During the whole process, the soil pH can maintain around neutral range and the electrical conductivity of soil was stable. The electricity consumption of the CEEK was quite low (89 USD per ton) and the corn plants still were alive throughout the remediation.
几十年来，由于灌溉系统受到废水污染，台湾的一些农田已被重金属污染。在这项研究中，循环强化电动修复（CEEK）和植物修复被交替应用于实际的铅污染场地。在开始时，使用 CEEK；然后，种植玉米。经过这种植物修复后，再次使用 CEEK。实验结果表明，经过三轮处理（CEEK+玉米+CEEK）后，土壤中的铅浓度可从 5672mg/kg 降低至 2083mg/kg（约 63%）。在每个阶段，CEEK、玉米植株和 CEEK 分别可以去除土壤中约 25%、5%和 30%的铅。整个过程中，土壤 pH 值保持在中性范围，土壤电导率稳定。CEEK 的耗电量相当低（每吨 89 美元），而且在整个修复过程中，玉米植株仍然存活。
