Effect Of Conductive Mineral Materials On Anaerobic Methanogenic Process Of Sodium Acetate

Methane production technology is one of the most successful worldwide biological energy strategy, which still have some shortcomings, such as the biomass utilization rate and the efficiency of methane-producing is low. Therefore, this article use sodium acetate as the sole carbon source of anaerobic microorganisms, then studied the effects of different conductive mineral materials on the release of methane. Furthermore, we studied the effects of different conductive mineral materials for the methane yield, methane production rate, the substrate consumption rate and the variation of microbial community structure in the anaerobic fermentation process. The mechanisms of the release of CH4 promoted by the conductive mineral materials in the anaerobic fermentation process were preliminarily discussioned.To explore the effects of the conductivity of graphite, activated carbon, magnetite, hematite, goethite, dolomite and ferrihydrite on the influence of the release of methane yield, methane production rate, and the sodium acetate degradation in the anaerobic fermentation process. Compared with the control group, the results showed that the conductive minerals(graphite, activated carbon, magnetite) and the semi conductive minerals(hematite and goethite) can obviously promote the anaerobic methanogenesis, and graphite for the promotion of sodium acetate anaerobic methanogenesis effect is the most significant, the release of methane carbon amount respectively increased by 8.92%, 7.09%,2.91%,2.24%,2.91%. On the contrary, methanogenesis was unchanged or suppressed in the presence of insulation mineral materials(dolomite and ferrihydrite).To explore the effects of the graphite with different particle size, shape, surface area on the cumulative methane yield and methane production rate and the substrate degradation in the anaerobic fermentation process. The results showed that the addition of graphite significantly stimulated methanogenesis from acetate, but in a certain range, the particle size, shape and surface area of graphite has little effects on methanogenesis from acetate. In other words, the particle size, shape and surface area of graphite is not the main factors influencing the accumulative methane production. And the community of microbes in the anaerobic system analysis results showed that the addition of graphite can change the microbial community structure in the anaerobic reactor, promote the growth of Methanosaeta and Methanosarcina..To explore the effects of mixed minerals on the release of methane from acetate sodium by adding graphite, goethite, and the mixture of graphite and goethite to the system. The results showed that the graphite, goethite, and the mixture of graphite and goethite can obviously promote the accumulative methane yield and methane production rate, reduce the output of CO2 at the same time. Compared with the control group, the release of methane carbon quantity increased by 10.37%,7.45%, 12.17%,respectively.