지방분해에 따른 혐기성 소화조 메탄가스 함량 및 미생물 군집 변화

Abstract

Recently, there are thousands of researches reporting on the relationship between methane contents and anaerobic digestion. Of these, it is obviously well-known that substrate plays a pivotal role in determining methane content. In this regard, we see the correlation between methane content and substrate. By tracing the relationship between component of substrate and methane contents data from a full-scale reactor, we could find out that The lipid proportion of the total organic matter decomposition is a positive correlation with methane content (r = 0.76, p < 0.05). Depending on the results of microbial analysis of full-scale reactor (NGS), the higher methane content is closely associated with dominance of hydrogenotrophic methanogen rather than aceticlastic methanogen.In the lab-scale experiment, according to the high lipid percentage, high carbon unit VFA such as HVal and HCap was more produced and hydrogen gas amount was increase. Methane content of treatment 1 (0% lipid proportion) is 56.2%, treatment 2 (50% lipid proportion) is 63.2% and treatment 3 (100% lipid proportion) is 68.2%, which is slightly higher than calculated by TMP. Carbon dioxide which is produced substrate degradation and hydrogen gas which is generated by decomposition of lipid was used as the substrate by hydrogenotrophic methanogen. In this study, when increase removed lipid proportion, it confirmed that methane content is also increased in two scale anaerobic digester. Because hydrogenotrophic methanogen uses carbon dioxide and hydrogen gas and produce additional methane gas.