磷添加剂对Bacillus spp.修复铀尾矿过程中细菌群落演替的驱动作用

Phosphorus additives driving the bacterial community succession during Bacillus spp.remediation of the uranium tailings

铀尾矿库中堆积的铀尾矿会产生环境污染问题。生物矿化可以有效降低铀尾矿中铀的浸出,降低铀尾矿的环境风险。然而,目前尚不清楚磷添加剂如何影响生物矿化过程中铀尾矿的微生物群落结构。在本研究中,评估了羟基磷灰石(HS)和β-甘油磷酸五水合物(GP)作为添加剂对Bacillus spp.修复铀尾矿过程中的微生物群落演替的影响。结果表明,磷添加剂有效地改变铀尾矿浸出液的pH值和铀浸出浓度,显著提高了微生物多样性,促进了微生物群落中门类微生物从actinobacteria向firmicutes和proteobacteria的演替。两种添加剂对细菌群落演替模式的影响不同,其中GP的促进作用较大。GP促进了微生物群落结构中核心物种尤其是Firmicutes的生长,在GP处理中,Bacillus,Pseudomonas,Desulfotomaculum,和Clostridium_sensu_stricto_12的丰度较高,表明这些属类微生物在微生物群落中发挥了重要作用。研究结果为磷添加剂参与生物修复和细菌群落演替提供了证据,从而为铀尾矿的生物矿化技术提供理论支撑。

Uranium tailings discharged into uranium tailings ponds could generate environmental pollution issues.Microbial-induced phosphate mineralization could reduce the release of uranium,in turn effectively managing pollution.However,it is unclear that how the phosphorus additives affect the microbial structure of uranium tailings under biomineralization.Herein,we evaluate the microbial community succession during Bacillus spp.remediation of uranium tailings,when adding hydroxyapatite(HS)and β-glycerol phosphate pentahydrate(GP).The results show that phosphorus additives effectively changed pH and uranium leaching concentration,significantly increased bacterial richness,and promoted microbial community succession,whilst promoting actinobacteria to Firmicutes and Proteobacteria populations.The two additives influenced the bacterial community succession patterns differently,with GP eliciting the greater enhancement.Additionally,GP enhanced the growth of core species and recognized the phylum firmicutes as a crucial taxon.The abundance of Bacillus,Pseudomonas,Desulfotomaculum,and Clostridium_sensu_stricto_12 was higher in GP treatments,indicating the substantial roles played by these genera in the microbial community.The results provide evidence of the involvement of the two phosphorus additives in bioremediation and bacterial community perturbations and thus provide new insights into the biomineralization technologies for uranium tailings.