摘要
利用Illumina MiSeq对sc CO_2-咸水-砂岩体系中微生物16S rRNA基因V3-V4区进行分析,探究高压反应釜体系中微生物对sc CO_2的响应及微生物对矿物反应的作用.结果显示,生物量受pH值影响较大,初始pH值为7.02,生物量11.02×10~6gene/mL,30d时pH值降至5.65,生物量降至0.26×10~6gene/mL;随着矿物溶蚀,90d时pH值增至5.87,生物量增至4.61×10~6gene/mL.群落结构中,phylum Proteobacteria(52.60%(30d),55.34%(90d))与phylum Firmicutes(46.89%(30d),43.89%(90d))为优势菌门.在属水平,30,90d时Exiguobacterium,Citrobacter,Acinetobacter与Pseudomonas为优势菌属.产酸菌(Exiguobacterium,Acinetobacter与Pseudomonas)促进了长石与粘土溶蚀,咸水中K~+,Na~+,Ca~(2+),Mg~(2+),T-Fe浓度高于空白组;铁还原菌(Citrobacter)提高了Fe(Ⅱ)/Fe(Ⅲ)比值;微生物膜对Ca~(2+)?Mg~(2+)?Fe~(2+)具有吸附作用.SEM结果显示,微生物介导下先于空白组出现菱铁矿沉淀. scCO_2~-咸水-砂岩体系中适应菌能促进矿物溶蚀与碳酸盐矿物捕获.
Through the Illumina MiSeq analysis within V3-V4 region of 16 S rRNA gene, the response of microorganisms to scCO2 and its feedback on the mineral interaction in scCO_2~-saline-sandstone system was investigated. The results showed that biomass was affected by p H value. The initial p H was 7.02 and biomass was 11.02×10~6gene/mL. And the pH dropped to 5.65 and biomass decreased to 0.26×10~6gene/mL at 30th-day. However with the dissolution of minerals, the pH increased to 5.87 and biomass increased to 4.61×10~6gene/mL at 90th-day. In the community structure, phylum Proteobacteria(52.60%(30d), 55.34%(90d)) and phylum Firmicutes(46.89%(30d), 43.89%(90d)) were dominant phylum. At the genus level, Exiguobacterium, Citrobacter, Acinetobacter and Pseudomonas were dominant genus at 30 th and 90th-day. Acid-producing bacteria(Exiguobacterium, Acinetobactera and Pseudomonas) promoted the dissolution of feldspar and clay, and the concentrations of K~+, Na~+, Ca~(2+), Mg~(2+) and T-Fe were higher than those in blank group. Iron-reducing bacteria(Citrobacter) increased the ratio of Fe(Ⅱ)/Fe(Ⅲ). Biofilm showed an adsorption function of Ca~(2+), Mg~(2+) and Fe~(2+). At last, the SEM results showed that the micron-mediated precipitation of siderite appeared before the blank group. Therefore, the adaptable bacteria in the scCO_2~-salt-sandstone system could promote the mineral dissolution and carbonates capture.
引文
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