State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Zhejiang 311300, Hangzhou, China.
Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Zhejiang 311300, Hangzhou, China.
Environ Sci Pollut Res Int. 2023 Nov;30(52):112813-112824. doi: 10.1007/s11356-023-30341-x. Epub 2023 Oct 16.
Heavy metal contamination to soil is tricky due to its difficult removal, long retention time, and biomagnified toxicity. The green and low-cost phytoremediation with electric field treatment and planting pattern selection is an emerging and more effective approach to remove heavy metals from soils. In this study, alternating current (AC) electric field-assisted phytoremediation was examined with different planting patterns, i.e., monoculture willow (Salix sp.), monoculture Sedum alfredii Hance, and interplanting of willow and S. alfredii. AC electric field greatly increased phytoremediation efficiency to soil cadmium (Cd) regardless of planting patterns, either single plant species of willow or S. alfredii. The Cd removal capacity of willow and S. alfredii raises apparently under 0.5 V cm AC electric field. Under different planting patterns of AC electric field treatment, Cd accumulation in the whole plant by interplanting was 5.63 times higher than monoculture willow, but only 0.75 times as high as monoculture S. alfredii. The results showed that AC electric field-assisted interplanting of willow and S. alfredii is a promising remediation technique for efficiently clean-up Cd-contaminated soil.
重金属污染土壤是棘手的，因为它难以去除，保留时间长，且具有生物放大毒性。利用电场处理和种植模式选择的绿色、低成本植物修复是一种新兴的、更有效的去除土壤中重金属的方法。在这项研究中，考察了不同种植模式下的交流电（AC）电场辅助植物修复，即单种柳树（柳属）、单种景天（Sedum alfredii Hance）和柳树与景天间种。无论采用单一种植柳树还是 S. alfredii 的种植模式，交流电电场都大大提高了对土壤镉（Cd）的植物修复效率。在 0.5 V cm 的交流电电场下，柳树和 S. alfredii 的 Cd 去除能力明显提高。在不同种植模式的交流电电场处理下，间种的整株植物对 Cd 的积累量是单种柳树的 5.63 倍，但仅为单种景天的 0.75 倍。结果表明，交流电电场辅助柳树和景天间种是一种很有前途的修复技术，可以有效地清除 Cd 污染土壤。
