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Noval porous phosphate-solubilizing bacteria beads loaded with BC/nZVI enhanced the transformation of lead fractions and its microecological regulation mechanism in soil
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2022-06-17 , DOI: 10.1016/j.jhazmat.2022.129402
Gongting Wang 1 , Xin Zhao 1 , Wenqing Luo 1 , Junjun Yuan 1 , Yali Guo 2 , Xiaonan Ji 3 , Wei Hu 2 , Min Li 1 , Zedong Teng 4
Affiliation  

Soil lead pollution becomes a serious environmental problem. Microbial remediation has received widespread attentions due to high efficiency and no secondary pollution. In this research, a noval porous spherical phosphate-solubilizing bacteria bead loaded with biochar/nZVI (Bio-bead) was used to passivate lead in soil, and the effects and microecological regulation mechanisms of this process were also investigated. The results showed that the pH, OM, and AP of soil in the Bio-bead group were increased and the ORP was decreased over time compared with the blank group. The proportion of stable (oxidizable and residue) fractions of lead in Bio-bead group (45%) was much higher than that of the blank group (35%). In addition, the result of microbial community structure showed that Bio-beads did not change the species of dominant bacterial, excepting the abundance of Pseudomonas increased significantly and the abundance of Sphingomonas reduced during remediation. Redundancy analysis showed that pH, OM, AP and the ratio of residual and oxidizable fractions lead in soil were positively correlated with the abundance of Pseudomonas, while ORP was negatively correlated with the abundance of Pseudomonas. These findings have proved that Bio-bead is a potential strategy for remediation of lead-contaminated soil even in complexed soils.



中文翻译:

新型多孔解磷菌珠负载BC/nZVI增强铅组分在土壤中的转化及其微生态调控机制

土壤铅污染已成为严重的环境问题。微生物修复由于效率高、无二次污染而受到广泛关注。本研究采用负载生物炭/nZVI(Bio-bead)的新型多孔球形溶磷菌珠对土壤中的铅进行钝化,并研究了该过程的效果和微生态调控机制。结果表明,与空白组相比,Bio-bead组土壤pH、OM、AP随着时间的推移而升高,ORP随着时间的推移而降低。Bio-bead组中铅的稳定(可氧化和残留)部分的比例(45%)远高于空白组(35%)。此外,微生物群落结构的结果表明,Bio-beads并没有改变优势细菌的种类,在修复过程中,假单胞菌显着增加,而鞘氨醇单胞菌的丰度降低。冗余分析表明,土壤中pH、OM、AP以及残留和可氧化部分铅的比例与假单胞菌的丰度呈正相关而ORP与假单胞菌的丰度呈负相关。这些发现证明,即使在复杂的土壤中,生物珠也是修复铅污染土壤的潜在策略。

更新日期:2022-06-21
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