Key Laboratory of Agricultural Water Resources, Hebei Key Laboratory of Soil Ecology, Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, Chinese Academy of Science, 286 Huaizhong Road, Shijiazhuang 050021, Hebei, China; University of Chinese Academy of Science, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China.
Key Laboratory of Agricultural Water Resources, Hebei Key Laboratory of Soil Ecology, Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, Chinese Academy of Science, 286 Huaizhong Road, Shijiazhuang 050021, Hebei, China.
Bioresour Technol. 2021 Jun;330:124996. doi: 10.1016/j.biortech.2021.124996. Epub 2021 Mar 16.
The aim of this study was to explore a novel method to immobilize heavy metals (HM) in composting through increasing the combination of these with humic substances. An electric-field assistant technique was applied to strengthen biomass biodegradation and assess the impact on the humification process and HM immobilization in composting. Results demonstrated that the application of an electric field enriched bacterial abundance and enhanced bacterial metabolism. Humic substance and humic acid (HA) contents in compost product were significantly increased by 19 and 69%, respectively. The HA-complexed Cu, Zn, As, Cd contents were increased by 34, 41, 29 and 135.1%, respectively, which was attributed to the promotion of HA formation since a positive correlation between HA and HA-complexed HM (R = 0.60-0.87) was established. The evidence presented here supports the future development of electric field implementation as an intrinsic bioremediation technique for HM immobilization.
本研究旨在探索一种通过增加腐殖质与重金属（HM）结合来固定堆肥中重金属的新方法。应用电场辅助技术来强化生物质生物降解，并评估其对腐殖化过程和堆肥中重金属固定的影响。结果表明，施加电场可富集细菌丰度并增强细菌代谢。腐殖质和腐殖酸（HA）在堆肥产物中的含量分别显著增加了 19%和 69%。与对照相比，HA 结合态 Cu、Zn、As 和 Cd 含量分别增加了 34%、41%、29%和 135.1%，这归因于 HA 形成的促进作用，因为 HA 与 HA 结合态 HM 之间存在正相关关系（R = 0.60-0.87）。本研究为电场作为一种用于固定 HM 的内在生物修复技术的未来发展提供了证据。
