Ma Hongyan, Zhao Ming, Yang Na, Feng Linhui, Wang Lirong, Jiang Chen, Jiang Ming, Guo Jianfang, Li Tianguo
College of Resources and Environment, Yunnan Agricultural University, Kunming, China.
Front Plant Sci. 2025 May 19;16:1557261. doi: 10.3389/fpls.2025.1557261. eCollection 2025.
Electrokinetic-assisted phytoremediation (EKAPR) improved the heavy metal accumulation has been extensively covered, but the uneconomic of heavy metal extraction increment unit energy consumption (EHME) limits its development.
The feasibility from the dual perspectives of regulated the electrokinetics application of different growth stages of Sedum plumbizincicola and electrochemical parameters affecting power consumption to enhance the EHME of EKAPR system were investigated.
Results shown that electrokinetic promoted heavy metals accumulation of S. plumbizincicola significantly, and it not show positive correlation absolutely with the application time. EK-B treatment exhibited high performance for Cu and Pb. Although the Cd and Zn extraction decreased 9.02%-15.63% for EK-B and EK-S compare with EK-W treatment due to difference in biomass, there was insignificant in the content. Comprehensive consideration of growth and accumulate characteristics, electrokinetic application in the booming stage (0.70 of PCA score) was alternative to replace whole growth period treatment. Orthogonal experiments results showed that four factors were insignificant with biomass, heavy metal content and extraction, while voltage gradients and application time had significant effect. The biomass and heavy metal extraction showed appropriate promoted effect in 1.5-2.5 V/cm, 100-150 h, whereas EHME continuous deceased and the decline rate relatively slow within 1.0V/cm, 100h. The result indicates the existence of optimization strategy, the best recommended strategy was T7 treatment, followed by T3, T8 and T12 treatments.
Overall, it is an acceptable option to study energy saving in terms of optimization of plant growth stage and electric field parameters, and provides novel perspectives for broadening the practical application.
电动辅助植物修复（EKAPR）提高重金属积累量的研究已广泛开展，但重金属提取增量单位能耗（EHME）不经济限制了其发展。
从调控不同生长阶段东南景天电动应用及影响功耗的电化学参数两个角度，研究提高EKAPR系统EHME的可行性。
结果表明，电动显著促进了东南景天对重金属的积累，且与施加时间并非绝对呈正相关。EK - B处理对铜和铅表现出高效性。尽管由于生物量差异，与EK - W处理相比，EK - B和EK - S处理的镉和锌提取量降低了9.02% - 15.63%，但含量差异不显著。综合考虑生长和积累特性，在旺盛期（主成分分析得分0.70）进行电动应用可替代全生育期处理。正交试验结果表明，四个因素对生物量、重金属含量和提取量影响不显著，而电压梯度和施加时间有显著影响。在1.5 - 2.5 V/cm、100 - 150 h时，生物量和重金属提取表现出适度的促进作用，而在1.0V/cm、100h范围内，EHME持续下降且下降速率相对较慢。结果表明存在优化策略，最佳推荐策略为T7处理，其次是T3、T8和T12处理。
总体而言，从优化植物生长阶段和电场参数方面研究节能是一个可接受的选择，并为拓宽实际应用提供了新视角。
