Innovation Academy for Green Manufacture, Key Laboratory of Green Process and Engineering, Beijing Engineering Research Centre of Process Pollution Control, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; University of Chinese Academy of Sciences, Beijing 100049, China.
College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China.
J Hazard Mater. 2021 Oct 5;419:126433. doi: 10.1016/j.jhazmat.2021.126433. Epub 2021 Jun 22.
Bioremediation technology has attracted increasing interest due to it efficient, economical and eco-friendly to apply to heavy metal contaminated soil. This study presents a new biological remediation system with phosphate functionalized iron-based nanomaterials and phosphate solubilizing bacterium strain Leclercia adecarboxylata. Different phosphate content functionalized iron-based nanomaterials were prepared, and nZVI@C/P1 (nP: nFe: nC=1:10:200) with high passivation efficiency was selected to combine with PSB for the remediation experiments. The change in lead fraction and microbial community under five conditions (CK, PSB, nZVI@C, nZVI@C/P1, nZVI@C/P1 + PSB) during 10 days incubation were investigate. The results indicated that nZVI@C/P1 + PSB increased the residual fraction of lead by 93.94% compared with the control group. Meanwhile, inoculation of Leclercia adecarboxylata became the dominant microflora in the soil microbial community during the remediation time, improving the utilization rate of phosphate in nZVI@C/P1 and enhancing the passivation efficiency of lead. Experimental findings demonstrated that combining nZVI@C/P1 with PSB could be considered as an efficient strategy for the lead contaminated soil remediation.
生物修复技术因其高效、经济和环保的特点，适用于重金属污染土壤，因此引起了越来越多的关注。本研究提出了一种新的生物修复系统，该系统使用了磷酸功能化铁基纳米材料和具有溶磷能力的假单胞菌菌株 Leclercia adecarboxylata。制备了不同磷酸含量的功能化铁基纳米材料，并选择具有高钝化效率的 nZVI@C/P1（nP:nFe:nC=1:10:200）与 PSB 结合进行修复实验。在 10 天的孵育过程中，研究了五种条件（CK、PSB、nZVI@C、nZVI@C/P1、nZVI@C/P1+PSB）下铅形态的变化和微生物群落。结果表明，与对照组相比，nZVI@C/P1+PSB 使铅的残留态增加了 93.94%。同时，在修复过程中，假单胞菌 Leclercia adecarboxylata 成为土壤微生物群落中的优势菌群，提高了 nZVI@C/P1 中磷酸盐的利用率，增强了铅的钝化效率。实验结果表明，将 nZVI@C/P1 与 PSB 结合可以被认为是一种有效的铅污染土壤修复策略。
