針鐵礦—產(chǎn)甲烷體系內(nèi)微生物代謝產(chǎn)物的作用研究
[Abstract]:Microbial metabolites play an important role in the formation of biological aggregates and the transformation and decomposition of pollutants during the biological treatment of wastewater. In recent years, the enhancement of anaerobic methanogenic process by iron oxides has received extensive attention from domestic and foreign researchers, but the role of microbial metabolites in this process is rarely reported. Therefore, through the construction of goethite-anaerobic methanogenic system, the microbial metabolites were enriched with different dialysate bags, and the methane production efficiency and microbial community changes of the reaction system were investigated. Shewanella oneidensis MR-1 was used as the object. The production characteristics of microbial metabolites in different forms of iron reduction system were investigated and analyzed, and the methanogenic bacteria, iron reducing bacteria and goethite system were constructed. ITRAQ proteomics technique was used to analyze the microbial metabolites in the system of pyrite and methane production, and the microbial community was characterized by high-throughput sequencing technique. The main conclusions are as follows: 1) the use of dialysis bags can improve the contact between goethite and microbes, but the larger porosity dialysis (10kDa) has little effect on methanogenic rate. However, the concentration of SMP and methanogenic rate were significantly increased by using dialysate bag (2000Da) with small porosity. SMP and its flavonoids may play an important role in the process of methanogenesis. Microbial community analysis showed that the enrichment of SMP not only increased the relative abundance of microorganisms with electrochemical activity in the system, but also promoted Uncultured Methanosaeta sp. of methanogenic bacteria of acetic acid type. 2) the effects of different conductive materials on iron reduction efficiency, microbial metabolites and the secretion of flavin were studied with Shewanella oneidensis MR-1 as the research object, and the possible iron reduction behavior in methanogenic system with goethite was explored. The results show that the effect of conductive materials on the reduction of goethite by S.oneidensis MR-1 is mainly composed of two aspects which affect the efficiency of electron transport and the activity of bacteria. Goethite stimulated S.oneidensis MR-1 to secrete more microbial metabolites at the early stage of culture, while the addition of conductive materials decreased the ratio of xanthins in S.oneidensis MR-1 microbial metabolites. CNTs effectively promoted the reduction of free iron Fe-NTA by S.oneidensis MR-1. Graphite can promote the reduction of goethite by S.oneidensis MR-1. 3) the results of high throughput analysis show that goethite can regulate the function of microbial community. The results of secretory protein and microbial community analysis showed that goethite significantly promoted end-methanogenic pathway and extracellular electron transfer / redox related processes. Microbes of Firmicutes gate, Anaerolinaceae family and Synergistetes gate were involved in the process of goethite promoting methanogenesis. At the same time, the addition of goethite made the methanogenic system with acetate as the substrate to realize the process of hydrogen methanogenesis. The results of iTRAQ proteomics analysis showed that the SMP protein was mainly derived from microbial self-cleavage.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TQ221.11;X703
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