School of Metallurgy and Environment, Central South University, Changsha 410083, China.
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
J Environ Sci (China). 2020 Apr;90:321-330. doi: 10.1016/j.jes.2019.12.001. Epub 2019 Dec 19.
Bauxite residue is the industrial waste generated from alumina production and commonly deposited in impoundments. These sites are bare of vegetation due to the extreme high salinity and alkalinity, as well as lack of nutrients. However, long term weathering processes could improve residue properties to support the plant establishment. Here we investigate the development of bacterial communities and the geochemical drivers in bauxite residue, using Illumina high-throughput sequencing technology. Long term weathering reduced the pH in bauxite residue and increased its nutrients content. The bacterial community also significantly developed during long term weathering processes. Taxonomic analysis revealed that natural weathering processes encouraged the populations of Proteobacteria, Chloroflexi, Acidobacteria and Planctomycetes, whereas reducing the populations of Firmicutes and Actinobacteria. Redundancy analysis (RDA) indicated that total organic carbon (TOC) was the dominant factors affecting microbial structure. The results have demonstrated that natural weathering processes improved the soil development on the abandoned bauxite residue disposal areas, which also increased our understanding of the correlation between microbial variation and residue properties during natural weathering processes in Bauxite residue disposal areas.
铝土矿残渣是氧化铝生产过程中产生的工业废物，通常沉积在堤坝中。由于极高的盐度和碱度以及缺乏养分，这些场地没有植被。然而，长期的风化过程可以改善残渣的性质，以支持植物的建立。在这里，我们使用 Illumina 高通量测序技术研究了铝土矿残渣中细菌群落的发展和地球化学驱动因素。长期风化降低了铝土矿残渣的 pH 值并增加了其养分含量。细菌群落也在长期风化过程中显著发展。分类分析表明，自然风化过程促进了变形菌门、绿弯菌门、酸杆菌门和浮霉菌门的种群，而减少了厚壁菌门和放线菌门的种群。冗余分析（RDA）表明，总有机碳（TOC）是影响微生物结构的主要因素。结果表明，自然风化过程改善了废弃铝土矿残渣处理区的土壤发育，这也增加了我们对铝土矿残渣处理区自然风化过程中微生物变化与残渣性质之间相关性的理解。
